D758 MiniPurge®
Manual
ML 434
Important Note:
It is essential for safety that the installer and user of the Expo system follow these
instructions.
Please refer to the standard for principles and definition.
These instructions apply only to the pressurizing system. it is the responsibility of the
manufacturer of the pressurized enclosure to provide instructions for the enclosure.
Expo Technologies reserves the right to replace any component, with one of the equivalent functionality.
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23-Mar-16
Section 1: System Specification ................................................................................................1
MiniPurge® Control Unit Data...................................................................................................2
Relief Valve Unit and Purge Outlet Valve with integral spark arrestor......................................3
Section 2: Quick User Guide ......................................................................................................3
Installation ................................................................................................................................3
Operation of the System ...........................................................................................................3
Section 3: Application Suitability ..............................................................................................4
Section 4: Description and Principle of Operation ..................................................................5
Section 5: Main Components .....................................................................................................6
Air Supply Filter / Regulator......................................................................................................6
Logic Air Supply Regulator .......................................................................................................6
Minimum Pressure Sensor .......................................................................................................6
Purge Flow Sensor ...................................................................................................................6
Intermediate Sensor .................................................................................................................7
Purge Timer ..............................................................................................................................7
Purge Complete Valve..............................................................................................................7
OR Gate ...................................................................................................................................7
Alarm Only Circuit (/AO) ...........................................................................................................7
Visual Indicators .......................................................................................................................7
Power Interlock Switch .............................................................................................................8
Alarm / Pressurized Switch.......................................................................................................8
System Purging Switch (Optional)............................................................................................8
Intermediate Switch ..................................................................................................................8
Purge Valve ..............................................................................................................................8
Purge Flow Restrictor ...............................................................................................................8
CLAPS Sensor .........................................................................................................................8
CLAPS Regulator .....................................................................................................................8
Relief Valve Unit .......................................................................................................................8
/PA Terminal Box......................................................................................................................9
Section 6: Installation of the System.........................................................................................9
Relief Valve Unit .......................................................................................................................9
Air Supply Quality .....................................................................................................................9
Pipe Work ...............................................................................................................................10
Multiple Enclosures ................................................................................................................10
Provision and Installation of Alarm Devices ...........................................................................10
Power Supplies and their Isolation .........................................................................................11
Power Interlock Switch ...........................................................................................................11
Section 7: Commissioning .......................................................................................................11
Commissioning the System ....................................................................................................11
Normal Operation ...................................................................................................................13
Section 8: Maintenance of the System....................................................................................13
General maintenance .............................................................................................................13
Additional maintenance checks ..............................................................................................13
Re-calibration of the Relief Valve Unit ....................................................................................13
Re-calibration of the Pressure Sensors ..................................................................................14
Section 9: Fault Finding............................................................................................................14
General Information................................................................................................................14
System purges correctly but trips and auto re-purges at the end of the purge time. ..............15
Relief Valve opens (continuously or intermittently).................................................................15
System enters purging but purge indication does not occur...................................................16
Section 10: Recommended Spares List ..................................................................................16
Section 11: Glossary.................................................................................................................16
Section 12: Drawings and Diagrams .......................................................................................17
Section 13: Certifications .........................................................................................................17
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i
Section 1: System Specification
5
X
LC / ss / OV / PC / PA
Size
5 = MiniPurge®
Purge flow rate:
6000 NI/min
PA = Power and Alarm. Integral
Ex e IIC T5 Gb
Ex tb IIIC T100ºC Db IP66
Power and Alarm. Integral
Ex e IIC T4 Gb
Power = 250 Vac 4 Amp (AC15) DPNO
Ex d IIC T6 Gb
Ex tb IIIC T80ºC Db
Alarm = 250 Vac 4 Amp (AC15) SPCO
Ex d IIC T6 Gb
Approval / Certification
ATEX Certificate:
Sira 01ATEX1295X
0518
II 2(2) GD
Ex [pxb] IIC T6 Gb
Ex [pxb] IIIC T85ºC Db
Tamb -20ºC to +55ºC
PC = Pressurized Control. Automatic
leakage compensation (CLAPS)
IECEx Certificate:
IECEx SIR07.0027X
Ex [pxb] IIC T6 Gb
Ex [pxb] IIIC T85ºC Db
Tamb -20ºC to +55ºC
OV = Purge Outlet Valve is
pneumatically operated
MiniPurge® Housing
ss = Stainless Steel 316L
TÜV INMETRO Certificate:
TÜV 12.1462X
Ex [pxb] IIC T6 Gb
Ex [pxb] IIIC T85ºC Db
Tamb -20ºC to +55ºC
Pressurization Method
LC = Leakage Compensation
Page 1
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MiniPurge® Control Unit Data
Action on Pressure Failure:
Alarm and Trip (isolate power to pressurized enclosure), user
adjustable Alarm Only.
Type of Operation:
Automatic leakage compensation using the Closed Loop Automatic
Pressurization System (CLAPS System).
Leakage Compensation
Capacity
1000 NI/min initial maximum pressurized enclosure leakage.
1900 NI/min maximum as leakage increases.
Enclosure Material:
Stainless Steel 316L.
Mounting Method:
Wall mounting straps. Fixing holes as per drawing.
Temperature Limits:
-20oC to +55oC
Compressed Air Supply:
Clean, dry, oil free air or inert gas. Refer to Air Supply Quality section
in Installation of the System.
Supply Pressure:
5 to 16 barg (73 to 232 psi).
Main Regulator:
Set at 5 barg, 40 m automatic drain supply inlet filter.
Logic Regulator and Gauge:
Fitted and set to 2.3 barg (33 psi).
Process Connections:
Purge supply and outlet to pressurized enclosure 1” NPT female.
Minimum supply line 25 mm (1”) ID tube, inlet sized appropriately for
flow rate.
Reference points & signals 1/8” NPT female, minimum 6 mm pipe to be
used.
Visual Indicators:
Alarm (Red
) / Pressurized (Green
System Purging (Yellow
/PA Terminal Box:
).
)
Stainless Steel, Ex e IIC T5 Gb / Ex tb IIIC T100ºC Db IP66
Tamb: -20ºC to +55ºC with terminals, front access cover & lower
removable gland plate.
Stainless Steel, Ex e IIC T4 Gb Tamb: -20ºC to +60ºC with terminals,
front access cover & lower removable gland plate.
Power Interlock Switch:
DPNO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Alarm Switch:
SPCO switch, contact ratings 250 VAC 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Intermediate Switch:
SPCO switch, contact ratings 250 VAC 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
System Purging Switch
(Optional):
SPCO switch, contact ratings 250 VAC 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Minimum Pressure Sensor:
Minimum: 0.5 mbarg.
Maximum: 5.0 mbarg.
Default Setting: 1.5 mbarg.
Tolerance -0, +0.7 mbarg.
Intermediate Sensor:
Minimum: 2.0 mbarg.
Maximum: 10 mbarg.
Default Setting: 5.0 mbarg.
Tolerance: -0, +10%
Note: There must be a 1.5 mbarg difference between the minimum pressure and intermediate sensors.
Purge Flow Sensor:
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Set at 6.4 mbarg (Tolerance: -0, +10%).
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CLAPS Sensor:
Minimum: 5.0 mbarg.
Maximum:15 mbarg.
Default Setting: 10 mbarg.
Tolerance: -0, +10%
Note: there must be a 2.5 mbarg difference between the intermediate and CLAPS sensor calibration point.
For example: Minimum pressure = 5 mbarg, intermediate pressure = 6.5 mbarg, CLAPS sensor = 9 mbarg.
Purge Time:
User selectable, 3-off time increments available. 10, 15 or 20 Minutes
(-0 + 25%). Maximum available purge time of 45 minutes.
Default Setting 45 minutes.
Weight:
27 kg (60lb).
Relief Valve Unit and Purge Outlet Valve with integral spark arrestor
Type:
Bore:
Relief Valve Lift-Off Pressure:
Flow Rate:
Material:
Mounting Method:
Weight:
RLV104/ss/FS, Design number D758RLV.
Purge Outlet Valve Ø 104 mm, Relief Valve Ø 75 mm.
Minimum:
20 mbarg.
Maximum:
50 mbarg.
Default:
30 mbarg (+0, -20%).
Range:
2000, 3000, 4000, 5000, or 6000 NI/min.
Default:
2000 NI/min.
Housing:
Stainless steel 316L.
Gasket:
Silicone foam.
Spark arrestor:
Stainless steel mesh.
Rectangular cut-out and fixing holes as per drawing.
7 kg (15.4 lb)
Section 2: Quick User Guide
Installation
The MiniPurge® System must be installed by a competent engineer, in accordance with relevant standards,
such as IEC / EN 60079-14 and any local codes or practice.
• Mount the purge system in accordance with the hook-up drawing.
• Ensure the system is installed according to the full instructions in the “Installation of the System” section
of this manual.
• All pipings must be clean and free of dirt, condensation and debris prior to connection to the purge
system or pressurized enclosure.
• It is strongly recommended that a local isolation valve is installed on the air supply upstream of the
purge system.
Note: Most faults are due to restricted air supply, inadequate supply pipe work or drop in air supply
pressure during the purge process.
Operation of the System
Once the system is installed correctly, turn on the air supply. Refer to Commissioning section.
Indicator
Colour
Status
Alarm / Pressurized
Red
Low pressure alarm (enclosure pressure too low)
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Indicator
Colour
Status
Purging
Black
Purge flow too low or not in purge mode
The purge system commences the purge cycle:
• The purge air will enter the enclosure.
• The pressurized enclosure will obtain a positive pressure.
• The Purge Outlet Valve will open within the Relief Valve Unit.
• The air will then exit the Relief Valve Unit housing via the spark arrestor.
Indicator
Colour
Status
Alarm / Pressurized
Green
Pressurized (minimum enclosure pressure achieved)
Purging
Black
Purge flow too low
Open the Purge Flow Restrictor Valve until the air flow reaches the required rate; the system will initiate the
timed purge cycle. Start a stopwatch when the purging indicator turns yellow.
Indicator
Colour
Status
Alarm / Pressurized
Green
Pressurized
Purging
Yellow
Purge flow rate above minimum
On completion of an uninterrupted purge cycle of the required length, the system will indicate purge
complete. Stop the stopwatch when the purging indicator turns black.
Indicator
Colour
Status
Alarm / Pressurized
Green
Pressurized and in leakage compensation mode
Purging
Black
No longer in purge mode
Check stopwatch timing to verify that the actual purge time is equal to or greater than the required purge
time.
Note: The recorded purge time must never be less than the required purge time.
The system is now operating correctly in leakage compensation mode.
If the system has not performed as expected, check the installation thoroughly and ensure it has been
carried out according to the instructions.
If an obvious problem has not been highlighted and corrected, follow the procedures in the Fault Finding
section.
If all checks have been carried out and the system still does not perform as expected, contact your local
distributor or Expo Technologies.
Section 3: Application Suitability
MiniPurge® systems are certified for use in hazardous locations, where the hazardous location is nonmining (above ground) and the hazard is caused by flammable gasses, vapours or dust. Depending on the
model the systems may be used in IECEx and ATEX Zone 1(21) and/or Zone 2(22) - Categories 2 and 3
respectively.
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MiniPurge® systems may be used for hazards of any gas group. Apparatus associated with the MiniPurge®
system, such as intrinsically safe signalling circuits and flameproof enclosures containing switching devices
may be limited in their gas group. The certification documentation supplied with any such devices must be
checked to ensure their suitability.
This system is primarily designed for use with compressed air. Where other inert compressed gasses are
used (Nitrogen, for example) the user must take suitable precautions so that the build up of the inert gas
does not present a hazard to health. Consult the Control of Substances Hazardous to Health (COSHH) data
sheet for the gas used. Where a risk of asphyxiation exists, a warning label must be fitted to the pressurized
enclosure.
The following materials are used in the construction of MiniPurge® systems. If substances that will adversely
affect any of these materials are present in the surrounding environment, please consult Expo Technologies
for further guidance.
Materials of Construction
Stainless Steel
Aluminium
Acrylic
Mild (Carbon) Steel
Nylon
Silicone
Brass
Polyurethane
Neoprene
ABS
Polycarbonate
Polyester (glass filled)
Section 4: Description and Principle of Operation
The MiniPurge® system is pneumatic in operation, with electrical interfaces.
Purge and pressurization is a method of protection used in Zone 1 (21) and/or Zone 2 (22) hazardous
locations to ensure that the interior of an enclosure is free of flammable gas. Addition of a MiniPurge®
system allows the electrical equipment within the enclosure to be used safely in a hazardous location.
The principle of purge and pressurization is as follows:
• Clean compressed air or inert gas is drawn from a non-hazardous location.
• The interior of the pressurized enclosure is flushed to remove any hazardous gas or dust.
• This is introduced into the pressurized enclosure to keep the internal pressure at least 0.5 mbarg above
the external pressure.
• Whilst pressurized, flammable gas cannot enter the enclosure from the environment.
Prior to switching on the power to the electrical equipment, the enclosure must be purged to remove any
flammable gas that might have entered the enclosure before pressurization. Purging is the process of
removal contaminated air and replacement with air (or inert gas) known to be free from flammable gas. The
duration of this purge process is normally ascertained by performing a purge test.
At the end of the purge cycle the system automatically switches to leakage compensation mode.The Purge
Outlet Valve is closed and the airflow is reduced but remains high enough to compensate for the leakage of
air from the enclosure whilst maintaining the minimum over pressure state.
In the event of pressure failure within the pressurized enclosure the system will raise an alarm in the form
of visual indicators and a volt free contact depending on the specification of the system. The default action
on loss of pressurization is alarm and automatic disconnect of power (A&T - Alarm and Trip). This can be
changed by the customer to Alarm Only (/AO), please refer to section titled Main Components.
The MiniPurge® system incorporates a Closed Loop Automatic Pressurization System (CLAPS). This allows
the system to detect a rise or fall of the enclosure’s internal pressure and adjust the leakage compensation
rate accordingly. Pressure variations are more likely during sudden start up of large rotating electrical
machines but can also be caused by changes in running temperature. This system has been specifically
designed to maintain a stable internal pressure within the enclosure.
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Pressure characteristics during purge and pressurization of a pressurised enclosure using a MiniPurge®
system that incorporates a CLAPS system:
Power Interlock switch
Alarm Only
Power Interlock switch
Alarm &Trip
Active
Contacts
Intermediate
pressure switch
Inactive
Minimum
pressure switch
Purging Pressure
Intermediate switch contacts
open. Intermediate sensor
sends falling pressure signal
CLAPS Regulator
Pressure
Minimum pressure switch contacts
open. Minimum pressure sensor sends
a low pressure signal.
Alarm indicator shows red (alarm only)
Alarm indicator shows red and power
is disconnected (Alarm and Trip)
Intermediate Pressure
Sensor Pressure
Minimum Pressure
Sensor Pressure
Purge Time
Machinery Start
Normal Operation
Fault Condition - loss of pressure
outside of CLAPS regulation
Section 5: Main Components
Air Supply Filter / Regulator
The unit is provided with a 40 m liquid / dust filter element as a precaution. The user of the MiniPurge®
system must ensure that air supply is to the quality stated in Air Supply Quality paragraph found in the
Installation of the System section. The regulator is factory set to 5 barg (73 psig) and regulates the pressure
of an air supply between 5 and 16 barg (73 to 232 psig). A pressure gauge is fitted down stream of the filter;
this should indicate no less than 5 barg (73 psig). During the purge cycle a pressure drop will be indicated
on the gauge.
Logic Air Supply Regulator
This device provides the system with a stable air supply pressure to the logic system and allows consistent
operation. The pressure level is factory set to 2.3 barg (33 psig) and can be verified by means of the integral
pressure gauge.
Minimum Pressure Sensor
This monitors the pressure inside the pressurized enclosure. When the pressure is below the minimum
required for safe operation, the pressure sensor causes the system to reset and the Alarm / Pressurized
indicator turns Red . The sensor is factory calibrated and set to operate in falling pressure at or above the
minimum specified pressure.
Purge Flow Sensor
The Purge Flow Sensor monitors flow through the Purge Outlet Valve. At correct purge flow rates, above
the minimum specified for purging, the sensor sends a signal that activates the purge timer. This sensor is
factory calibrated to operate on falling flow rate at or above the minimum specified purge flow rate.
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Intermediate Sensor
This sensor monitors the pressure inside the pressurized enclosure. It senses when the pressure is drops
and provides early warning before the low pressure sensor trips the system. The setting on this is user
selectable.
Purge Timer
When both the enclosure pressure and the purge flow rate are correct, the Purge Flow Sensor activates the
timer to start the timing period. The purge time is set by opening/closing the pinch valve so that the sum of
the open valves times equals or exceeds the required purge time. At least one valve must be open, and the
screws must be at the appropriate limit of travel. Do not over tighten. The purging indicator will turn yellow
during timing.
Purge Complete Valve
This valve receives a signal from the purge timer that indicates the completion of the purge cycle and verifies
that the pressurization signal is still present. If both conditions are satisfied a signal is sent to indicate that
the purge is complete. This performs two functions: to turn on the electrical supply to the pressurized
enclosure and to reduce the high purge flow rate to leakage compensation mode. It also provides a hold-on
signal that maintains the leakage compensation mode with the power switch on, even when the purge timer
has reset ready for the next purge cycle.
OR Gate
This device provides the Purge Complete Valve with the hold-on function referred to previously. When either
the timed-out signal or the purge complete signal is present it allows the pilot signal to be sent to the purge
complete valve.
Alarm Only Circuit (/AO)
If the pressure in the pressurized enclosure is too low the system will normally cut off electrical power to it.
In certain circumstances, where local codes of practice allow, the system can be altered to provide a holdon circuit that will maintain the electrical power supply to the pressurized enclosure while also providing a
pressure failure alarm. The user must respond to the alarm and either restore the pressure to the
pressurized enclosure or otherwise make the installation safe; for example, cut off the electrical supply. The
decision to use the Alarm Only facility, and the allowable length of time for non-pressurized operation, is the
responsibility of the user.
Warning: It is potentially dangerous to energise the pressurized enclosure in an non-pressurized
condition when it is known that there is potentially explosive gas or dust in the hazardous location.
Visual Indicators
Visual indicators are fitted to provide status information to the operator.
Alarm / Pressurized Indicator
Green*
Pressurized
Red
Pressure Alarm (enclosure pressure low)
System Purging Indicator
Black*
Purge flow too low (not in purge mode)
Yellow
Purging (flow above minimum)
* The Green
/ Black
combination indicates normal operation of the pressurized enclosure after the
initial purging cycle has been completed.
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Power Interlock Switch
This flameproof power switch is activated by the signal from the Purge Complete Valve. This activation can
be used to turn on the electrical supply to the pressurized enclosure. The cable from the switch is terminated
in the /PA terminal box.
Alarm / Pressurized Switch
This flameproof switch is operated by the pressurized signal. It allows a remote electrical system status
indicator to show either pressurized or a pressure failure alarm. The cable from the switch is terminated in
the /PA terminal box.
System Purging Switch (Optional)
This switch is operated by the purge flow signal that allows a remote electrical system status indicator to
signal that the system is purging; sometimes referred to as purge in progress. The cable from the switch is
terminated in the /PA terminal box.
Intermediate Switch
This is a flameproof switch which is activated by the signal from the Intermediate Sensor. The cable from
the switch is terminated in the /PA terminal box.
Purge Valve
This changeover valve selects between purge air flow or leakage compensation. It is sized to allow sufficient
air into the enclosure during purging based on: the specified air supply pressure range, the minimum
specified purging outlet flow rate +10% and the expected leakage rate from the pressurized enclosure. At
the end of the purge cycle, the purge valve closes in response to the “Purge Complete” signal; it remains in
the closed position until the next purge cycle is initiated.
Purge Flow Restrictor
This valve restricts the purge flow to the minimum required flow rate. The Purge Flow Restrictor must be
readjusted during commissioning.
CLAPS Sensor
This sensor monitors the pressure within the pressurized enclosure and sends a control signal to the CLAPS
Regulator. The normal running pressure must be determined prior to system start-up so that the CLAPS
Sensor may be set to the level required to control the CLAPS Regulator.
CLAPS Regulator
This is the regulator that controls the leakage compensation air flow into the enclosure after the purging is
complete. It either increases or decreases the air flow into the enclosure as appropriate to maintain a stable
running pressure.The CLAPS Regulator must be set at the time of commissioning.
Relief Valve Unit
The Relief Valve Unit allows the purge air to exit the enclosure safely via a built-in spark arrestor. This spark
arrestor is designed to prevent the emission of arcs, sparks and incandescent particles produced within the
pressurized enclosure.
Purge air passes through the Relief Valve Unit; the preset pressure differential across the appropriate orifice
ensures that the purge flow sensor is activated once the selected purge flow has been attained.
During the purge cycle a pneumatic cylinder operates the Purge Outlet Valve that lets the air from inside the
enclosure exhaust through the Relief Valve Unit. When the system changes to leakage compensation mode,
the Purge Outlet Valve is closed and the enclosure sealed.
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The Relief Valve Unit has an in-built relief valve.This is sized to ensure that, if the air supply pressure rises
up from the specified maximum, the internal enclosure pressure will not exceed the specified maximum
working pressure of the pressurized enclosure.
/PA Terminal Box
Increased Safety
Ex e IIC T5 Gb
Ex tb IIIC T100ºC Db IP66
Tamb -20ºC to +55ºC
Ex e IIC T4 Gb
Tamb -20ºC to +60ºC
The Terminal Box is increased safety (Ex e) certified and incorporates the terminal connection points for the
alarm and interlock switches. All contacts provided are volt free (dry).
Cable entry methods (for example conduit or cable glands) must be certified to IECEx, ATEX or INMETRO
standards. The main requirement is that IP66 (or better) ingress protection must be provided by use of seals
or washers.
Section 6: Installation of the System
The MiniPurge® is designed for use under normal industrial conditions of ambient temperature, humidity and
vibration. Please consult Expo before installing this equipment in conditions that may cause stresses beyond
normal industrial conditions.The MiniPurge® system must be installed by a competent person in accordance
with relevant standards, such as IEC / EN 60079-14, and any local codes of practice.
The MiniPurge® control unit should be installed either directly on, or close to the pressurized enclosure. It
should be installed such that the system indicators and certification labels are in view.
All parts of the system carry a common serial number. If installing more than one system, ensure that this
commonality is maintained within each system installed.
Relief Valve Unit
To achieve effective purging, the points where air enters and exits the pressurized enclosure should
normally be at opposite ends of the enclosure. The RLV unit must be mounted vertically and there should
be a minimum clearance of 300 mm (12") around the spark arrestor (purge outlet).
It is important that the interior and exterior of the spark arrestor is kept clean and debris is not allowed to
accumulate; this might affect the calibration of the device. In particular the exterior of the spark arrestor
should not be painted or blocked in any way.
Air Supply Quality
The MiniPurge® system should be connected to a protective gas supply, which is suitable for purging and
pressurization.
The supply pipe connection to the MiniPurge® must be appropriate for the maximum input flow rate for the
application.
The air supply must be regulated at a pressure less than the maximum stated inlet pressure.
The air supply must be: clean, non-flammable and from a non-hazardous location. The air should be of
Instrument Air Quality. Although the purge control system will operate with lower air quality, its operational
life will be adversely affected. The equipment that is being protected by the MiniPurge® may also suffer
because of poor air quality.
With reference to BS ISO 8573-1: 2010, Instrument Air is typically specified as:
Particle Class 1
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In each cubic metre of compressed air, the particulate count should not exceed 20,000 particles in the 0.1
to 0.5 micron size range, 400 particles in the 0.5 to 1 micron size range and 10 particles in the 1 to 5 micron
size range.
Humidity or pressure dew point
The dew point, at line pressure, shall be at least 10 °C below the minimum local recorded ambient
temperature at the plant site. In no case, should the dew point at line pressure exceed +3 °C.
Oil Class 2
In each cubic metre of compressed air, not more than 0.1mg of oil is allowed. This is a total level for liquid
oil, oil aerosol and oil vapour.
When an inert gas is being used to supply the purge system, risk of asphyxiation exists. Refer to Application
Suitability section.
Before connection of the air supply to the purge system, the supply pipe work should be flushed through with
instrument quality air to remove any debris that may remain in the pipes. This must be carried out for at least
10 seconds for every meter of supply pipe.
Unless a supply shut-off valve has been fitted to the MiniPurge® system, an external shut-off valve with the
same, or larger, thread size as the Control Unit inlet fitting should be fitted by the installer to prevent any
restriction of purge flow.
The purge air from the MiniPurge® Control Unit should be piped within the pressurized enclosure to ensure
purging of potential dead air spots.
The purge system is fitted with an internal regulator factory set to 3 bar feeding the logic.
Pipe Work
If the MiniPurge® is not connected directly to the pressurized enclosure, pipe work and fittings used to
connect the Control Unit to the pressurized enclosure should be either metallic or appropriate to the
environment into which the system is installed. No valve may be fitted in any signal pipe connecting the
Control Unit to the pressurized enclosure. This pipe work must be fitted in accordance with local codes of
practice where relevant.
Multiple Enclosures
This system is suitable for the purge and pressurization of the primary pressurized enclosure and its
associated terminal boxes.
Provision and Installation of Alarm Devices
When the pressure inside the pressurized enclosure is above the minimum, the Minimum Pressure Sensor
returns a positive (pressurized) signal causing the alarm indicator on the control unit to change from red to
green.
When the pressure falls below the minimum permissible the positive (pressurized) signal is removed. This
absence of signal indicates a low pressure alarm condition and causes the alarm indicator on the control
unit to go from green to red.
There are volt free (dry) contacts available within the terminal box for remote usage.
The user must make use of this alarm facility in accordance with the local code of practice for Action on Pressure or Flow Failure. Most codes include the following recommendations:
• Zone 1 Installations: Alarm and Automatic Trip of Power.
• Zone 2 Installations: Alarm Only on pressure or flow failure with power being removed manually.
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Power Supplies and their Isolation
All power entering the pressurized enclosure should have a means of isolation. This requirement also
applies to any external power sources that are connected to the equipment such as volt-free (dry) contacts
within the pressurized enclosure. This is commonly achieved using the Power Interlock Switch.
Power Interlock Switch
This switch is a Double Pole Normally Open, double-break switch: it provides two independent contacts that
should be connected in series and used to isolate the power. This can be achieved using switchgear or other
suitable switching device. These contacts are terminated and accessible to the user in the Ex e terminal box.
It is the responsibility of the user to ensure that the switch is only operated within appropriate technical limits.
The switch must be replaced after any short circuit that occurs within the main circuit; the switch is a piece
of encapsulated equipment and as such it is not possible to check the state of the contacts. Technical
modifications to the switch are not permitted.
Prior to commissioning, check that the Ex e terminal box is clean, the connections have been made properly,
the cables laid correctly and all screws in the terminals are secure.
In all cases the application and isolation of power must be controlled by the MiniPurge® system using the
power interlock signal.
No switches are permitted between the power switch and the MiniPurge® system other than an authorized
manual override circuit.
The safe use of this switch is the responsibility of the user, all electrical installations must conform to local
codes of practice.
Exception
Power to apparatus that is already suitable for use in hazardous locations need not be isolated by the
MiniPurge® system.
Section 7: Commissioning
Commissioning the System
Note: The steps 11 and 15 to 21 represent detailed commissioning tests
The following equipment is needed for this process:
• Continuity meter
• Gauge manometer (0 to 200 mbarg)
• Differential manometer
If, after commissioning, the system does not perform as expected, refer to the Fault Finding Section.
Follow the steps as outlined:
1. Check all connections and that the Relief Valve Unit is fitted correctly with an unobstructed path to the
purge exhaust.
2. Close the Purge Flow Restrictor Valve.
3. Fully open external supply shut-off valve where fitted.
4. Check that the internal logic pressure gauge reads 2.3 barg / 33 psi / 230 kPag.
5. Check that the pressure gauge on main air supply reads 5 barg / 73 psi / 500 kPag.
6. Check that the Pressure Relief Valve is correctly set by disconnecting the minimum pressure sensing
pipe at the bulkhead fitting on the input to the MiniPurge®. This will disable all of the pressure sensors.
Page 11
ML434 | v12l
• Using a 4 mm nylon tube, connect a manometer to the bulkhead fitting from which the minimum
pressure sensing pipe was removed.
• Open the Purge Flow Restrictor Valve very slowly, until the Pressure Relief Valve opens
• Check the opening pressure is within calibration limits.
• This test can be carried out several times to ensure repeatability and compliance.
Refer to the Maintenance of the System section if the Relief Valve needs recalibrating.
7. Close the Purge Flow Restrictor Valve.
8. Remove the manometer and reconnect the minimum pressure sensing pipe to the bulkhead fitting.
9. Remove red plug from the top of the Minimum Pressure Sensor and connect a gauge manometer.
10.Connect a differential manometer to the test points on the flow sensor.
11.To check sensor calibration
• The internal pressure in the pressurized enclosure must be below Relief Valve lift off pressure and
above the CLAPS pressure
• At this time the pressurized indicator should be green.
• gradually open Purge Flow Restrictor Valve until purging indicator turns yellow.
Note: For large volumes it may take a long time for the purge flow to start.
• very slowly close Purge Flow Restrictor Valve until the purging indicator turns back to black.
• Take a reading from pressure gauge.
12.To set the purge flow rate:
• Turn on the compressed air to the MiniPurge®.
• Gradually open the Purge Flow Restrictor Valve until the black / yellow indicator changes to yellow.
• The yellow indicator confirms the correct flow rate.
• The differential pressure should be greater than 6.4 mbarg.
• The relief valve is supplied with different orifice plates for the specified flow rate. This orifice plate is
held in position by two M3 screws and can easily be changed by removing the large cover plate from
over the outlet valve assembly and screws.
Warning: When opening the Purge Flow Restrictor Valve, ensure the over pressure within the pressurized enclosure does not exceed the pressure relief valve setting.
13.The purge timer will start as soon as the Purging Indicator turns yellow. Check that the time delay
between the indicator turning to yellow and returning to black is not less than the minimum time
required for complete purging of the pressurized enclosure. Times in excess of minimum are permitted.
14.After the purge has been completed, the Purge Valve will close and the air flow into the pressurized
enclosure will be controlled by the CLAPS Regulator. The initial setting may be too high or too low.
15.Gradually turn the CLAPS Regulator anti-clockwise to reduce enclosure pressure.
16.Reduce regulator until intermediate sensor causes contacts to open.
17.Check the manometer on the minimum pressure sensor.
18.Continue to reduce the CLAPS Regulator to test the minimum pressure sensor.
19.To check operation of Minimum Pressure Sensor, check readings on manometer as system will
automatically re-purge when it reaches minimum pressure.
20.While the system re-purges, return the CLAPS Regulator to the initial setting.
21.If minimum pressure is below the set point, refer to the Recalibration section
22.If the setting is too high, continual rising and falling of the enclosure pressure will be seen as the CLAPS
Regulator automatically shuts off and reinstates the flow. The CLAPS Regulator should be adjusted to
reduce the flow into the pressurized enclosure by turning the adjuster screw anti-clockwise.
ML434 | v12l
Page 12
23.If the initial setting is too low the CLAPS Regulator may not provide enough air flow causing a gradual
decline in enclosure pressure. To increase the flow into the pressurized enclosure, adjust the CLAPS
Regulator Relief Valve unit by turning the adjuster screw clockwise.
24.To test the CLAPS settings, create a leak in the system by removing a bolt or losening a gland plate in
order to create a 15mm hole. Remember to replace bolt or retighten gland plate after testing.
25.The setting of the CLAPS Sensor is factory calibrated to the normal working pressure expected in the
pressurized enclosure, typically 10 mbarg. The pressure in the pressurized enclosure should be
stabilized as close as possible to this figure. This can be checked by a manometer attached to the
minimum pressure sensor.
26.Remove the air supply to the system, remove all test equipment and replace all plugs.
Normal Operation
For normal operation of the system, after commissioning has been carried out it is possible to turn the air
supply valve on or off to start or stop the system. After this, the purge and pressurization sequence is
automatic.
Section 8: Maintenance of the System
General maintenance
The maintenance of the system outlined in this manual should be supplemented with any additional
requirements set out in appropriate local codes of practice.
The following checks should be carried out every 6 – 36 months dependent on environment
according to IEC / EN 60079-17
• Tests outlined in the Detailed Commissioning section.
• Ensure that the Relief Valve Unit is free from contamination prior to making any adjustment. To do this:
• Remove large cover plate using a 8 mm spanner (wrench).
• Check that the interior and all components are clean and free from contamination.
• Replace large cover plate.
• Check the condition of the air supply filter element. Clean or replace as necessary.
Additional maintenance checks
The following additional checks are recommended at least every 3 years:
Check that:
• Apparatus is suitable for use in the hazardous location.
• There are no unauthorised modifications.
• The air supply is uncontaminated.
• The interlocks and alarms function correctly.
• Approval labels are legible and undamaged.
• Adequate spares are carried.
• The action on pressure failure is correct.
Re-calibration of the Relief Valve Unit
Warning
Incorrect adjustment of the Relief Valve Unit can lead to significant over pressure and result in
damage to the enclosure.
If maximum pressure setting is reached, stop adjustment and reduce the pressure.
To perform the following adjustments, an 8 mm spanner (wrench) and a 2.5 mm hex key will be required.
Page 13
ML434 | v12l
Ensure that the Relief Valve Unit is free from contamination prior to making any adjustment. To do this:
• Remove large cover plate using a 8 mm spanner (wrench).
• Check that the interior and all components are clean and free from contamination.
• Replace large cover plate
To adjust the lift off pressure of the Relief Valve:
• Attach test equipment as described in the Commissioning Section.
• Remove small cover plate.
• Whilst holding the central adjustment screw in position using the hex key, loosen the retaining nut.
• Adjust the hex key clockwise to increase, or anti-clockwise to reduce the lift off pressure.
• Before testing, retighten the locking nut whilst holding the adjustment screw in place.
• Carry out the commissioning tests to check the correct setting of the relief valve after adjustment.
• The adjustment is sensitive and it is recommended that a 1/4 turn (maximum) adjustments are applied
between tests.
A llen Sc rew & Lock N UT Rem ov ing t he sm a ll cov er pl a te t o set t he RL V o penin g pressur e Orific e P la te
Re-calibration of the Pressure Sensors
The brass nozzle on the sensor is sealed into position using Loctite thread sealant. If the thread has seized
up, remove to a safe area and heat slightly to soften prior to making any adjustment. This prevents potential
damage to the brass of the nozzle.
• Disconnect pipe work from the sensor, including pipe located below the sensor.
• Remove sensor by unscrewing anti-clockwise.
• The nozzle is located under the sensor.
• The adjustment is sensitive, turn the nozzle in 1/8 of a turn steps.
• Turn clockwise to reduce the pressure setting and anti-clockwise to increase.
• Replace sensor, screwing clockwise.
• Reconnect all pipe work.
Section 9: Fault Finding
General Information
If you are having problems that cannot be corrected using one of the methods described, please call Expo
or your supplier for further assistance. If the system is less than 12 months old, parts under warranty should
be returned to Expo for investigation. A full report of the fault and the system serial number should
accompany the parts.
It is common for problems with the MiniPurge® system to be caused by contamination of the air supply with
oil, water or dirt. To prevent these problems, the air supply must contain a dust filter and a water filter. This
ML434 | v12l
Page 14
will ensure that the air is instrument quality and protect both the purge system and the equipment being
purged. This filtration system is not provided by Expo and must be sourced separately.
Contamination can enter the system from a number of sources. To prevent this, it is essential that the
procedures described in the Installation section are carried out prior to first use of the system. These
procedures should also be carried out following any disconnection and re-connection of the pipe work.
Failure to perform these procedures may cause damage to the system that will not be covered by the
warranty.
The system has been designed for ease of fault finding and many of the components fitted are plug-in or
chassis mounted. Check components by substitution only after establishing that such action is necessary.
Before carrying out the fault finding procedures, ensure that:
• Both the main air pressure to the system and for Motor Purge Systems, the regulated pressure to the
logic manifold are as specified on the settings sheet.
• Air pressure does not drop below the minimum supply pressure during purging; the majority of faults
reported are due to insufficient air supply during the purge cycle.
System purges correctly but trips and auto re-purges at the end of the purge time.
This is a result of the pressure within the pressurized enclosure being below the minimum pressure sensor
setting. The pressure can be checked using a manometer. The most common causes of this problem are
outlined below:
Fault Location
Pressurised Enclosure
CLAPS Regulator
MiniPurge® Control Unit
Cause
There is debris on the face of the
Relief Valve disk held in place by
the magnet.
Enclosure leaking excessively.
Pressure sensing tube damaged.
The CLAPS Regulator setting is
too low.
the Minimum Pressure Sensor
setting has drifted above the
CLAPS setting
Solution
• Remove debris and ensure RLV
disk is clean.
• Ensure all doors and covers are
closed and that all conduit and
cable glands are properly sealed.
• Seal any other leaks.
• Replace tubing.
• Increase the setting of the CLAPS
regulator to raise the pressure in
the pressurised enclosure after
purging.
• To do this, turn clockwise.
The Minimum Pressure Sensor needs
re-calibrating.
• Refer to Re-calibration of Pressure
Sensors in the Maintenance
section
Relief Valve opens (continuously or intermittently)
Fault Location
Cause
Solution
Pressurised Enclosure
Enclosure pressure is too high
due to CLAPS Regulator being
open to far.
Adjust the CLAPS Regulator.
Relief Valve Unit
Debris on the Relief Valve disk
allowing air to leak from the valve.
Remove Relief Valve cover and clean
the valve disk.
Page 15
ML434 | v12l
System enters purging but purge indication does not occur.
Fault Location
Air Supply
Cause
Insufficient flow rate due to
inadequate air supply pressure.
Often due to pressure drop in the
supply pipe.
Pressurized Enclosure
Excessive leakage from the
pressurized enclosure.
Pipe Work
Tubing from Relief Valve flow
sensing point not air tight.
Relief Valve Unit
Relief Valve opening during purge
MiniPurge Control Unit
Flow sensor setting incorrect
Solution
Static pressure of 5 barg must be
maintained during purge
• Check air supply pressure at the
inlet to the control unit.
• Ensure that the supply pipe bore is
suitable for the flow rate
• Check around the enclosure while
purging is taking place.
• Total leakage at purge outlet valve
should not exceed 10% of purge
flow sensor setting.
• Check for leakage down cables
and conduit.
• Ensure fitting nuts are tightened.
• Check for tube damage.
• Repair as necessary.
• Check enclosure pressure on start
up is less than Relief Valve lift off
pressure.
• Check the pressure is correct on
the flow sensor.
Section 10: Recommended Spares List
Part Number
Description
KFL-AO1N-001
Filter Kit for S0015/275 filter / regulator
S0030/606
Purge flow sensor factory set to 6.4 mbarg
S0030/016
Minimum Pressure sensor, must be factory set to the value as stated on the
Customer Test and Inspection Sheet
S0030/478
Intermediate pressure sensor
S0030/588
CLAPS Sensor must be factory set to the value as stated on the Customer Test
and Inspection Sheet
S0015/018
Pressure gauge (Air Supply Pressure), 0 - 10 barg
S0015/135
Miniature gauge (Logic Pressure), 0-4 barg
Note. The system’s Pneumatic Timer may be replaced with the Expo Electronic Timer. Please contact Expo Technologies’
Sales Team for further details.
Section 11: Glossary
Acronym
Definition
A&T
Alarm and Trip
AO
Alarm Only
CLAPS
Closed Loop Automatic Pressurization System
CU
Control Unit
ML434 | v12l
Page 16
Acronym
Definition
ET
Electronic Timer
FCV
Flow Control Valve
IS
Intrinsically Safe
LC
Leakage Compensation
PA
Power and Alarm
RLV
Relief Valve Unit
Section 12: Drawings and Diagrams
Title
Drawing Number
Number of Sheets
D758 Control Unit - Pneumatic Timer
D758MOTORSYS-P
2
Typical D758 Hook Up
D758-HU
1
D758-3 P and I Diagram
D758-PI
1
D758 Circuit Diagram - Pneumatic Timer
AGM-PA00-029
1
D758 Ex e Terminal Box Layout
AGE-WC00154
1
Manual Override Switch Hook Up
AGE-WC00-117
1
Size 5 MOTORPURGE RLV
XBR-RTD0-009
1
MiniPurge®
XBR-7TD0-040
1
TP-518-058-wd
1
X LC Sequence Diagram
System Status Indication
Section 13: Certifications
Download the certificates at www.expoworldwide.com/downloads.
Component
Certificate
Number
Purge System
ATEX Certificate
SIRA 01ATEX1295X
IECEx Certificate
IECEx SIR07.0027X
INMETRO/TÜV Certificate
TÜV 12.1462X
ATEX Certificate
ITS 10ATEX37092X
IECEx Certificate
IECEx ITS 10.0003X
INMETRO/TÜV Certificate
TÜV 12.1463
Ex d limit switch
IECEx EPS 14.0092X
Ex d limit switch
EPS 14 ATEX 1766 X
MIU/e Ex e Terminal Box
Electronic Switches
Page 17
ML434 | v12l
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ML434 | v12l
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ML434 | v12l
Page 20
DR'WN
CHK'D
APP'D
D R A W IN G S T A T U S :
APPROVED:
DAT E:
MO D. No:
IS S U E :
3rd A N G L E
P R O JE C T IO N
D I M E N S I O N S IN m m
F IN IS H
M A T E R IA L
PURGE AIR DISTRIBUTION
AS REQUIRED
M OTOR
MINIPURGE
JOB No:
T IT L E
C U S T O ME R :
S U R R E Y K T 7 0R H
U N IT E D K IN G D O M
S H E ET N o.
OF
See drawing
A G M - P A 00 - 02 1
D R A W IN G N o .
SC ALE
SYSTEM PURGING contacts
ALARM / PRESSURIZED contacts
INTERMEDIATE PRESSURE contacts
POWER INTERLOCK contacts
Measuring point for minimum pressure
Air inlet
Measuring point for flow of purge air
Ensure outlet is not obstructed
Expo Technologies Limited
B O O S T A IR
CONTROL
UNIT
Air outlet
R E LI E F V A LV E U N I T
The contents of this drawing / docum ent are Copyright ¤ Expo Technologies Lim ited. They are to be treated as confidential and are returnable
upon request. They are not to be copied or com m unicated in part or in whole without written consent from Expo Technologies Lim ited, neither
are they to be used in any way against our interests.
PURGE OUTLET VALVE open signal
UNS P E CIFIE D
T O LERANCES
N O D E C P LA C E ± 0 . 5
1 D E C P LA C E ± 0 . 2
2 D E C P L A C E ± 0 .1
F LA T N E S S T O B E LE S S T H A N 0. 4m m O V E R A N Y 10 0m m LE N G T H
M O T O R CO O LE R
D O N O T SC ALE
Page 21
ML434 | v12l
DR'WN
CHK'D
APP'D
D I M E N S I O N S IN m m
IS S U E :
D R A W IN G S T A T U S :
APPROVED:
DAT E:
MO D. No:
UNS P E CIFIE D
T O LERANCES
M I N IP U R G E
C O N TR O L LO G I C
XI
XC
M A N U ALLY SE T
PU RG E B OO S T FLO W
C O N TR O L VA LVE
H
F IN IS H
M A T E R IA L
PI
B O O S T A I R C O N T R O L U N I T ( O P T I O N A L)
A U TO M A TI C
LE A KA G E
C O M P E N S A T IO N
V A LV E
H
M AN UA LLY S E T
PU RG E FLO W
C O N T RO L VA LVE
H
PI
PUR GIN G /
PU RG E
C O M PLE T E
LO W
P RES SU R E P A L
A LA R M
M I N I P U R G E S Y S T E M E N C LO S U R E
1/ 2" N PT
C O N N E C T T O E IT H E R
A OR B
A
B
* 1 " [ 2 5 m m ] I.D . M IN I M U M
*
1 / 4 " [ 6 m m ] I.D .
JOB No:
T IT L E
1/8"
N PT
1/8"
N PT
R E LI E F
V A LV E
AS SE M BLY
1 /8 "
N PT
C U S T O ME R :
S U R R E Y K T 7 0R H
U N IT E D K IN G D O M
O PTI O N A L
S H E ET N o.
D R A W IN G N o .
SC ALE
E L E C T R I C A L S I G N A L V I A E E x e J U N C T IO N B O X
R E C O M M E N D E D M IN IM U M S IZ E FO R P U R G E A I R D I S T R IB U T IO N
PIPEW OR K
M O T O R E N C LO S U R E
Expo Technologies Limited
1" N P T
O P E N P U R G E O U T L E T V A L V E C O N T R O L S IG N A L
1/8" NP T
1 / 4 " [ 6 m m ] I.D .
1 /8 " N PT TE ST PO I N T
N O RM A LLY PLU GG E D
D . P . L O F R O M R E LI E F V A L V E
D . P . H I F R O M R E LI E F V A L V E
1/8" NP T
1/8" NP T
M O T O R IN T E R L O C K
I N TE R M E DI ATE PRE S SUR E
A L A R M / P R E S S U R IZ E D
1 / 4 " [ 6 m m ] I.D .
OF
The contents of this drawing / docum ent are Copyright ¤ Expo Technologies Lim ited. They are to be treated as confidential and are returnable
upon request. They are not to be copied or com m unicated in part or in whole without written consent from Expo Technologies Lim ited, neither
are they to be used in any way against our interests.
S Y S T E M P U R G IN G ( O P T I O N A L )
N O D E C P LA C E ± 0 . 5
1 D E C P LA C E ± 0 . 2
2 D E C P L A C E ± 0 .1
F LA T N E S S T O B E LE S S T H A N 0. 4m m O V E R A N Y 10 0m m LE N G T H
1/ 2" N PT
1" N P T
D O N O T SC ALE
S U P P LY
5 - 1 6 b a r g ( 7 3 - 2 3 0 p si )
I N S TRUM E N T
AI R /I N E R T G A S
1 " [ 2 5 m m ] I. D. M IN I M U M
3rd A N G L E
P R O JE C T IO N
ML434 | v12l
Page 22
DR'WN
CHK'D
APP'D
22
DRAWING STATUS:
APPROVED:
DATE:
MOD. No:
ISSUE:
23
3rd ANGLE
PROJECTION
DIMENSIONS IN mm
16
18
2
15
19
DO NOT SCALE
28
1
21
29
FINISH
MATERIAL
12
5
6
2
14
7
13
17
4
26
24
JOB No:
CUSTOMER:
Expo Technologies Limited
8
SURREY KT7 0RH
UNITED KINGDOM
3
1
25
9
SHEET No.
DRAWING No.
SCALE
27
OF
The contents of this drawing / document are Copyright ã Expo Technologies Limited. They are to be treated as confidential and are returnable
upon request. They are not to be copied or communicated in part or in whole without written consent from Expo Technologies Limited, neither
are they to be used in any way against our interests.
TITLE
UNSPECIFIED NO DEC PLACE ±0.5
TOLERANCES
1 DEC PLACE ±0.2
2 DEC PLACE ±0.1
FLATNESS TO BE LESS THAN 0.4mm OVER ANY 100mm LENGTH
DR'WN
CHK'D
APP'D
IS S U E :
D R A W IN G S T A T U S :
APPROVED:
DAT E:
MO D. No:
10 2
1 01
A LA R M /
P RE SS U RI S E D
C O N T A CT S
1 02
10 1
I N T ER M ED I A T E
PR E SS U R E
CO N T A C T S
S EE CI R CU I T D I A G R A M
105
10 3
1 06
PO W E R
I N T E RL OC K
CO N T A C T S
107
1 08
1 04
1 05
10 6
POW ER
I N T ER LO C K
CO N TA CTS
S EE CI R CU I T D I A G R A M
104
I N T E RM E DI A T E
PR ES S U RE
CO N TA CTS
1 03
B LA C K
B LA C K
AL A RM /
PR ES S U R I S E D
CO N T A C T S
U N S P E C I F IE D
T O LERANCES
N O D E C P LA C E ± 0 . 5
1 D E C P LA C E ± 0 . 2
2 D E C P L A C E ± 0 .1
F LA T N E S S T O B E LE S S T H A N 0. 4m m O V E R A N Y 10 0m m LE N G T H
G REY
G REY
B LA C K
B LA C K
B RO W N
B RO W N
G REY
G REY
G REY
10 9
F IN IS H
JOB No:
T IT L E
C U S T O ME R :
Expo Technologies Limited
S U R R E Y K T 7 0R H
U N IT E D K IN G D O M
M A XI M UM PER T ER MI N A L A T 5 5 ° C : 2 5 0 V 4 A (A C -1 5 )
M A T E R IA L
D O UB LE LI N ES S H OW T HE PO S I T I O N O F T E RM I N A L E N D PLA T ES
4
1 13
3
11 2
A L L T E R M I N A L S M U S T B E E x e CE R T I F IE D K E M A 9 8 A T E X 1 6 8 3 U , I E C E x U L D 0 5 .0 0 0 8 U .
1 11
T ER M I N A L L A Y OU T F OR
SYSTEM FITTED WITH "SYSTEM
PURGING" CONTACTS
TERMINAL LAYOUT
2
110
S Y S T EM
PU RG I N G
C O N T A CT S
11 0
1
N OT ES
10 8
1 09
S H E ET N o.
D R A W IN G N o .
SC ALE
OF
The contents of this drawing / docum ent are Copyright ¤ Expo Technologies Lim ited. They are to be treated as confidential and are returnable
upon request. They are not to be copied or com m unicated in part or in whole without written consent from Expo Technologies Lim ited, neither
are they to be used in any way against our interests.
E X T R A T E R M IN A L S M A Y B E F I T T E D . T H E N U M B E R O F T E R M I N A L S M U S T N O T E X CE E D T H E
M A X I M U M S P EC I F I ED I N T H E T ER M I N A L B O X C E R T I F I CA T E - C O N S U L T E X P O T E CH N O L O G I ES .
1 07
G REY
B RO W N
B RO W N
BLUE
BLUE
B LA C K
B LA C K
B RO W N
B RO W N
D I M E N S I O N S IN m m
B RO W N
D O N O T SC ALE
B LA C K
3rd A N G L E
P R O JE C T IO N
G REY
Page 23
ML434 | v12l
ML434 | v12l
Page 24
DR'WN
CHK'D
APP'D
D R A W IN G S T A T U S :
APPROVED:
DAT E:
MO D. No:
IS S U E :
3rd A N G L E
P R O JE C T IO N
D I M E N S I O N S IN m m
D O N O T SC ALE
F IN IS H
M A T E R IA L
JOB No:
T IT L E
C U S T O ME R :
Expo Technologies Limited
* TERMINAL NUMBER ACCORDING TO MOTOR SYSTEM
CABLE GLANDS ARE NOT SUPPLIED.
GLAND PLATE IN PURGE SYSTEM IS UNDRILLED.
S U R R E Y K T 7 0R H
U N IT E D K IN G D O M
S H E ET N o.
D R A W IN G N o .
SC ALE
OF
The contents of this drawing / docum ent are Copyright ¤ Expo Technologies Lim ited. They are to be treated as confidential and are returnable
upon request. They are not to be copied or com m unicated in part or in whole without written consent from Expo Technologies Lim ited, neither
are they to be used in any way against our interests.
MANUAL OVERRIDE SWITCH SUPPLIED LOOSE.
N O D E C P LA C E ± 0 . 5
1 D E C P LA C E ± 0 . 2
2 D E C P L A C E ± 0 .1
F LA T N E S S T O B E LE S S T H A N 0. 4m m O V E R A N Y 10 0m m LE N G T H
UNS P E CIFIE D
T O LERANCES
280
MOD NUMBER
DRAWN
4666
4793
REV.
01
02
03
ML434 | v12l
16/10/2009
17/04/2009
20/02/2009
APPROVED DATE
JPdB
JPdB
JPdB
APPROVED
274
202
330
306 CRS
240 CRS
EXCHANGEABLE
ORIFICE PLATE
10-OFF
FIXING POINTS
TO SUIT M8
DR'WN
NAH
CHK'D
NRB
APP'D
JPdB
Controlled
FINISH
88
NOTES
PURGE AIR OUTLET
43
DIFFERENTIAL FLOW SIGNAL
LOW PRESSURE
OPEN PURGE OUTLET
VALVE SIGNAL
DIFFERENTIAL FLOW SIGNAL
HIGH PRESSURE
MOTOR ENCLOSURE
TEST POINT (PLUGGED)
NROB
STAINLESS STEEL 316L
1.6mm THK
JOB No:
TITLE
CUSTOMER:
SIZE 5 MOTORPURGE RLV
SURREY KT7 0RH
MOUNTING DETAILS
Expo Technologies LimitedUNITED KINGDOM
5. ON INSTALLATION ENSURE THAT FIXING
BOLTS ARE EVENLY TIGHTENED TO A
TORQUE OF 5 Nm (44 lbf/in)
4. PART CODE: ARV-1048-107
3. WEIGHT IS APPROXIMATELY 7 kg
2. THE RELIEF VALVE MUST BE MOUNTED
IN THE ORIENTATION SHOWN.
9.4
= 240 =
10.8
= 274 =
12.0
= 306 =
1:5
03
REV:
SHEET No.
1
OF
1
XBR-RTD0-009
DRAWING No.
SCALE
10 FIXING POINTS
TO SUIT M8
LARGE COVER PLATE FOR
CHANGING THE ORIFICE PLATE
INSPECTION COVER
The contents of this drawing / document are Copyright © Expo Technologies Limited. They are to be treated as confidential
and are returnable upon request. They are not to be copied or communicated in part or in whole without written consent
from Expo Technologies Limited, neither are they to be used in any way against our interests.
1. RELIEF VALVE SUPPLIED WITH USER
SELECTABLE ORIFICE PLATES TO SET
THE FLOW RATE.
11/02/2009 MATERIAL
DRAWING STATUS:
DRAWN DATE:
MOTOR ENCLOSURE OVER PRESSURE
RELIEF VALVE ASSEMBLY
PURGE AIR OUTLET
SPARK ARRESTOR
MUST NOT BE OBSTRUCTED
120 CRS
DO NOT SCALE
30
256 CRS
136
60
NO DEC PLACE ±0.5
1 DEC PLACE ±0.2
2 DEC PLACE ±0.1
FLATNESS TO BE LESS THAN 0.4mm OVER ANY 100mm LENGTH
10.1
= 256 =
UNSPECIFIED
TOLERANCES
8.9
= 225 =
DIMENSIONS IN mm
4.7
= 120 =
3rd ANGLE
PROJECTION
95
Page 25
ML434 | v12l
Page 26
MOD NUMBER
DRAWN
5434
REV.
01
02
No
No
No
20/12/2011
23/06/2010
APPROVED DATE
Purge timer resets
3rd ANGLE
PROJECTION
JPdB
JPdB
APPROVED
"Purging" Indicator
Purge flow falls below minimum
Purging Indicator turns Black as
DR'WN
BRD
CHK'D
PSC
APP'D
JPdB
Controlled
FINISH
"Pressurized" signal absent i.e. "Alarm" ON
Red = Pressure Low
PRESSURIZED INDICATOR
SURREY KT7 0RH
CUSTOMER:
1:1
02
REV:
SHEET No.
1
OF
1
XBR-7TD0-040
DRAWING No.
SCALE
THE RELEVANT EXPO CERTIFICATION DRAWING IS EP99-2-3
Optional operation (User decision)
Automatic operation by the system
Manual operation by the user
Key to functions
MINIPURGE X LC SEQUENCE DIAGRAM
JOB No:
TITLE
"Purge Complete" signal to electrical Power Switch
Black = Purge flow too low
Yellow = Purge flow OK
Power turned off automatically without delay
Minimum Pressure sensor turns off
Expo Technologies Limited UNITED KINGDOM
Alarm and delayed trip
"Pressurized" signal to remote alarm switch
include:- Alarm and/or Trip
Green = Pressure OK
depends upon the user. Actions
Action taken on pressure failure
Enclosure door opened, or excessive leakage
Enclosure pressure falls below the minimum
Pressurizing air or inert gas turned off
The contents of this drawing / document are Copyright © Expo Technologies Limited. They are to be treated as confidential
and are returnable upon request. They are not to be copied or communicated in part or in whole without written consent
from Expo Technologies Limited, neither are they to be used in any way against our interests.
PRESSURIZED INDICATOR
"Pressurized" signal absent i.e. "Alarm" ON
23/06/2010 MATERIAL
DRAWING STATUS:
DRAWN DATE:
Power on - Normal operation
Leakage Compensation starts
Purge flow ceases; Relief Valve closes
Purge valve closes; Power Sw. signal ON
Purge timer times out
Yes
Outlet flow still above the minimum?
Purge timer starts automatically
Purge Flow Sensor turns on
Yes
Purge Outlet flow above the minimum?
Relief Valve opens Purge flow starts
Minimum Pressure sensor turns on
Yes
Is the PE pressure above the minimum?
Air enters the PE
Turn Pressurizing air or inert gas on
Red = Pressure Low
PRESSURIZED INDICATOR
UNSPECIFIED
TOLERANCES
NO DEC PLACE ±0.5
1 DEC PLACE ±0.2
2 DEC PLACE ±0.1
FLATNESS TO BE LESS THAN 0.4mm OVER ANY 100mm LENGTH
Pressurized Enclosure door closed
DO NOT SCALE
DIMENSIONS IN mm
3rd ANGLE
PROJECTION
DR'WN
BRD
CHK'D
PSC
JPdB
Controlled
APP'D
DRAWING STATUS:
FINISH
19/03/2009 MATERIAL
MOTOR LOW PRESSURE
SHUTDOWN
INTERMEDIATE
OR PRE-ALARM
PURGE COMPLETE NORMAL OPERATION
DURING PURGE
SYSTEM STATUS
DRAWN DATE:
DO NOT SCALE
RED
GREEN
GREEN
GREEN
BLACK
BLACK
BLACK
YELLOW
INDICATORS
101 102 103
101 102 103
101 102 103
104 105 106
104 105 106
104 105 106
107 108 109 110
107 108 109 110
107 108 109 110
JOB No:
ML434 | v12l
CUSTOMER:
SYSTEM STATUS INDICATION
SURREY KT7 0RH
107 108 109 110
Expo Technologies LimitedUNITED KINGDOM
101 102 103
104 105 106
SYSTEM
PURIGING
OPTION
The contents of this drawing / document are Copyright © Expo Technologies Limited. They are to be treated as confidential
and are returnable upon request. They are not to be copied or communicated in part or in whole without written consent
from Expo Technologies Limited, neither are they to be used in any way against our interests.
TITLE
NO DEC PLACE ±0.5
1 DEC PLACE ±0.2
2 DEC PLACE ±0.1
FLATNESS TO BE LESS THAN 0.4mm OVER ANY 100mm LENGTH
BLACK
BLACK
BLACK
BLACK
UNSPECIFIED
TOLERANCES
GREY
GREY
GREY
GREY
DIMENSIONS IN mm
BROWN
BROWN
BROWN
BROWN
GREY
GREY
GREY
GREY
BROWN
BROWN
BLACK
BLACK
BLACK
BLACK
BLACK
BLACK
BROWN
BROWN
GREY
GREY
GREY
GREY
BROWN
BROWN
BLUE
BLUE
BLUE
BLUE
111 112 113
111 112 113
111 112 113
BLACK
1:1
05
REV:
SHEET No.
2
OF
2
TP-518-058-WD
DRAWING No.
SCALE
111 112 113
BLACK
BLACK
BLACK
GREY
GREY
GREY
GREY
BROWN
BROWN
BLACK
BLACK
BROWN
BROWN
BROWN
BROWN
Page 27
ML434 | v12l
Page 28
This equipment and any acceptable variation thereto is specified in the schedule to this certificate and
the documents therein referred to.
Sira Certification Service, notified body number 0518 in accordance with Article 9 of Directive 94/9/EC of 23
March 1994, certifies that this equipment has been found to comply with the Essential Health and Safety
Requirements relating to the design and construction of equipment intended for use in potentially explosive
atmospheres given in Annex II to the Directive.
7
8
EN 60079-2:2014
70012182
Form 9400 Issue 1
This certificate and its schedules may only be
reproduced in its entirety and without change.
Project Number
II 2(2) GD
Ex [pxb] ia IIC T6 Gb
Ex [pxb] ia IIIC T95°C Db
(Ta –20°C to +55°C)
II 2(2) GD
Ex [pxb] IIC T6 Gb
Ex [pxb] IIIC T85°C Db
(Ta –20°C to +55°C)
Standard/ET versions:
Page 1 of 7
II 2(2) GD
Ex [pxb] d e m ia IIC T3 Gb
Ex [pxb] d e m ia IIC T4 Gb
Ex [pxb] ia IIIC T200°C Db
Ex [pxb] ia IIIC T135°C Db
(Ta –60°C to +55°C)
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
C Ellaby
Deputy Certification Manager
II 2(2) GD
Ex [pxb] d e m ia IIC T3 Gb
Ex [pxb] d e m ia IIC T4 Gb
Ex [pxb] ia IIIC T200°C Db
Ex [pxb] ia IIIC T135°C Db
(Ta –60°C to +55°C)
II 2(3) GD
Ex [pzc] IIC T6 Gb
Ex [pzc] IIIC T85°C Db
(Ta –20°C to +55°C)
Low temperature/ET versions
The marking of the equipment shall include the following:
11
II 2(2) GD
Ex [pyb] IIC T6 Gb
Ex [pyb] IIIC T85°C Db
Ta –20°C to +55°C)
Low temperature versions:
This EC type-examination certificate relates only to the design and construction of the specified equipment. If
applicable, further requirements of this Directive apply to the manufacture and supply of this equipment.
11
Standard versions:
If the sign ‘X’ is placed after the certificate number, it indicates that the equipment is subject to special
conditions for safe use specified in the schedule to this certificate.
The above list of documents may detail standards that do not appear on the UKAS Scope of Accreditation, but have been added
through Sira’s flexible scope of accreditation, which is available on request.
EN 60079-0:2012
Compliance with the Essential Health and Safety Requirements, with the exception of those listed in the
schedule to this certificate, has been assured by compliance with the following documents:
10
9
The examination and test results are recorded in the confidential reports listed in Section 14.2.
Equipment intended for use in Potentially Explosive Atmospheres Directive 94/9/EC
Certificate Number:
Sira 01ATEX1295X
Issue:
9
Equipment:
Purge Controllers: Sub-MiniPurge, MiniPurge, Super-MiniPurge,
Super-MiniPurge 1800/3500/7000/7000X
Applicant:
EXPO Technologies Limited
Address:
Unit 2, The Summit, Hanworth Road, Sunbury on Thames, Surrey TW16 5DB UK
2
3
4
5
6
EC TYPE-EXAMINATION CERTIFICATE
1
Sira 01ATEX1295X
Issue 9
Metal foam
Tortuous path with at least 4 x 90°or 2 x 180° bends
Multi-layer stainless steel mesh
Knitted mesh
Threaded Orifices e.g. ¼″ NPT or 2″ BSP with a built in spark arrester. These are selected to maintain a
desired back pressure within the Ex p protected apparatus when used with the Continuous Flow options.
The designation of each outlet orifice indicates the nominal inlet diameter. The designations are as
follows: SA3, SA6, SA9, SA12, SA19, SA25, SA32, SA38 and SA50.
Plain holes in the Relief Valve disk, sized according to the flow rate required.
Replaceable orifice type SAU**.
•
•
Form 9400 Issue1
Page 2 of 7
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
Pneumatically Operated Outlet Valve - The pneumatically operated outlet valve is used to
positively open or close the outlet of the purged enclosure by means of a spring return pneumatic
cylinder. Systems fitted with the Pneumatically Operated Outlet Valve will carry the option OV.
High Pressure Sensor for LC Systems (HP code) - If the pressure in the pressurized enclosure
rises above the setting of the High Pressure sensor, the purge gas flow is isolated from the pressurised
enclosure. The valve isolates both the leakage compensation and the purge streams. On detecting the
overpressure, an optional facility is available for the generation of an alarm or indicator. On systems
with a High Pressure sensor, the relief valve may be omitted.
High Pressure Sensor for CF Systems (HP code) - If the pressure in the pressurized enclosure
rises above the setting of the High Pressure sensor, the controller resets cutting the power to the
enclosure. On detecting the overpressure an optional facility is available for the generation of an alarm
or indicator. On systems with a High Pressure sensor, the relief valve may be omitted.
•
•
•
Outlet Orifice - Three types of orifice are used:
•
•
The outlet of each relief valve is fitted with a spark arrestor, of which there are four optional types:
RLV3, RLV6, RLV9, RLV12, RLV19, RLV25, RLV26, RLV52, RLV36, RLV75, RLV104, RLV125, RLV150 and
RLV200.
Relief Valve - The MiniPurge controller is supplied with an optional overpressure relief valve, which is to be
fitted to the Ex p protected apparatus to prevent an internal overpressure above the maximum overpressure
rating of the apparatus. There are 14 models of relief valve; the designation of each relief valve refers to its
nominal bore in mm, as follows:
The MiniPurge option pD is for use in combustible dust
The MiniPurge control unit may be supplied within a heated enclosure to permit the use of the system within
an ambient temperature down to –50oC.
LC-Leakage compensation only after initial high purge
CF-Continuous flow (same flow rate during and after purging)
CF2-Two flow CF system with initial high purge rate only at one orifice
CFHP-Continuous (lower) flow after initial high purge
The Purge Controllers are pneumatically operated devices, which are intended to provide a given flow rate of
purging gas for a predetermined time to unspecified Ex p protected electrical equipment. The MiniPurge
Control Units provide one of the following four methods of purge operation.
DESCRIPTION OF EQUIPMENT
This certificate and its schedules may only be
reproduced in its entirety and without change.
13
EC TYPE-EXAMINATION CERTIFICATE
SCHEDULE
Page 29
ML434 | v12l
Sira 01ATEX1295X
Issue 9
Form 9400 Issue1
This certificate and its schedules may only be
reproduced in its entirety and without change.
Page 3 of 7
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
a
Size or Capacity
1
Sub-MiniPurge
Model Number:
2
MiniPurge
3
Super-MiniPurge
1 X LC cs DS SS AA MO FM OA TW
4
Super-MiniPurge 1800
Key:
5
Super-MiniPurge 3500
a b cc mm Example option codes
6
Super-MiniPurge 7000
7
Super-MiniPurge xxxx
b
Pressurization Type
X
X Pressurization
Y
Y Pressurization
Z
Z Pressurization
cc
Action after initial purging
LC
Leakage Compensation only after initial High Purge
CF
Continuous Flow (same flow rate during and after purging)
CF2
Two Flow CF system with initial High Purge rate but only one orifice
CFHP
Continuous (lower) Flow after initial High Purge
DP
Dust Protection (pressurization only)
mm
Material of the Control Unit Enclosure
al
Aluminium alloy
cs
Mild steel, painted
ss
Stainless steel
bp
Back Plate only
co
Chassis only
pm
Panel mounting
nm
Non-Metallic
Option codes (Added only if used)
AA
Active Alarm output fitted.
AC
Alarm cancellation circuit.
AO
"Alarm Only" Action on Pressure or Flow Failure.
AS
Alarm "Action on Pressure or Flow failure", Selector valve.
CS
Containment System Monitor.
DS
Door switch Power Interlock fitted.
DT
Delayed Trip after Pressure or Flow failure.
DXXX
Special design for specific flow rates
ET
Electronic Timer
FM
Flow Meter(s) fitted.
HP
System LC or CF with High Pressure Sensor
IS
Internal Switches suitable for Ex i circuits.
MO
Manual Override fitted.
MT
Mechanical Timer.
OA
On/Off switch controlling Protective gas and logic supply.
OB
On/Off switch controlling logic supply only.
OC
On/Off switch controlling Protective gas supply only.
OS
Outlet (Orifice) Selector valve.
OV
Outlet valve, pneumatically operated.
PA
"Ex" switch(es) built-in, with/without "Ex" junction box.
PC
PE Pressure Control Leakage Compensation Valve (CLAPS System.)
PO
Pneumatic Output signals for Power and Alarm control.
SP
Secondary Pressurization supply options.
SS
Separate Supply for Protective gas and Logic air.
TW
Twin (or more) outputs for two or more separate pressurized enclosures purged in paralle
LS
Local Sensing for internal overpressure monitoring
EC TYPE-EXAMINATION CERTIFICATE
SCHEDULE
Model Number Designation for ATEX approved MiniPurge systems
Old Name:
Expo Telektron Safety System Limited
New name:
Expo Technologies Limited
A change of the Applicant’s name on the certificate and the substitution of the new name for the
old name on the approved label affixed to the purge controllers:
Any suitably ATEX, Category 2 approved cable gland may be used, if it can be used with the
ambient temperature range.
An Ex e terminal box is provided within the main enclosure for connection of the heater leads. This
polyester box is manufactured by Bartec and coded Ex e II T6 under BAS 98ATEX3008X. Other
alternative ATEX terminal boxes may be used as a replacement if they are suitably certified, carry
the same or greater ambient temperature range, occupy the same or smaller physical space, have
the same certification code and have the same Temperature Class.
RTDs are fitted to the air inlet pipe-work and inside the purge controller enclosure.
The enclosure is made from 1.5mm or 2.5 mm thick stainless or mild steel painted and the lid is
made from 1.5 mm thick stainless steel, lined with 38 mm thick insulation, or other materials with
equivalent insulating properties. The purge inlet, purge outlet and pressure sensing lines are
similarly insulated. The door may optionally be hinged with quick release catches, these will be
fitted with a padlock. An enclosure breather tube is fitted to help prevent condensation. A plastic
clear viewing window may optionally be fitted to the door.
The heater (500 W maximum) is manufactured by Intertec-Hess GmbH and coded Ex d m IIC T3
(max) under PTB 02ATEX1041X. If the outer enclosure is reduced in size the power of the heater
may be reduced in proportion to the reduction in surface area. Other alternative heaters may be
used as a replacement if they are suitably certified, carry the same or greater ambient
temperature range, occupy the same or smaller physical space, have the same certification code
and have the same or more restrictive Temperature Class.
Form 9400 Issue1
II 2(2) G D
Page 4 of 7
The ATEX coding is modified to:
[Ex pD] II T200°C 21 (Ta = -20°C to +55°C) [Ex pD] II T85°C 21 (Ta = -20°C to +55°C) -
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
(used with the low temperature versions)
(used with the standard temperature versions)
To permit the pressurisation of enclosures for the exclusion of combustible dusts in accordance
with IEC61241-4:2001 and modification of the marking to include one of the following:
This certificate and its schedules may only be
reproduced in its entirety and without change.
i.
Sira 01ATEX1295X
Issue 9
The purge controller to be fitted inside an additional, heated, stainless steel enclosure that allows
it to be used down to -50oC.
Variation 2 This variation introduced the following change:
ii.
i.
Variation 1 This variation introduced the following changes:
EC TYPE-EXAMINATION CERTIFICATE
SCHEDULE
ML434 | v12l
Page 30
To permit the inclusion of the following coding for the Low Temperature MiniPurge Enclosure:
Ex [p] dem IIC T4
Ex pD II 21 T135°C
(Ta –50oC to +55oC)
The introduction of the /ET version, an alternative to the pneumatic or mechanical timer system,
this incorporates an Electronic Timer Module ETM-IS**-*** in the Mini Purge, the certification
includes ‘ia’ marking when the ETM is fitted.
The dust marking was changed to be consistent with the marking for gases and vapours.
The introduction of a high pressure sensor for the LC option.
Following appropriate re-assessment to demonstrate compliance with the requirements of the
latest EN 60079 series of standards, the documents previously listed in section 9, EN 60079-0:
2006 and EN 60079-2: 2004 were replaced by those currently listed (EN 61241-0: 2006 was
removed as this is incorporated into the current version of 60079-0), the markings in section 12
were updated accordingly and a new condition of certification was added.
The recognition of the Applicant’s address change from Summer Road, Thames Ditton, Surrey KT7
0RH to Unit 2, The Summit, Hanworth Road, Sunbury on Thames, Surrey TW16 5DB.
Form 9400 Issue1
Page 5 of 7
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
The inlet air temperature sensing system was changed; as a consequence, a Special Condition For
Safe Use was amended.
A Local Sensing (LS) option was introduce.
The RLV configuration was changed to show an optional alternative position of the flow sensing
connection.
The recognition of minor drawing modifications; the addition of notes and the clarification of the
markings etc., these amendments are administrative that do not affect the aspects of the product
that are relevant to explosion safety.
The minimum ambient temperature limit for the Low Temperature and Low Temperature/ET
versions was lowered from -50°C to -60°C.
Following appropriate assessment to demonstrate compliance with the latest technical knowledge,
Following appropriate assessment to demonstrate compliance with the latest technical knowledge, EN
60079-0:2012, EN 60079-2:2007, IEC 61241-4:2001 Edition 1 and EN 61241-4:2006 were replaced
by EN 60079-0:2012 and EN 60079-2:2014, the markings in section 12 were updated accordingly.
This certificate and its schedules may only be
reproduced in its entirety and without change.
vi.
v.
iv.
ii.
iii.
i.
Variation 8 - This variation introduced the following changes:
i.
Variation 7 - This variation introduced the following change:
i.
Variation 6 - This variation introduced the following change:
ii.
iii.
i.
Variation 5 - This variation introduced the following changes:
i.
Sira 01ATEX1295X
Issue 9
Following appropriate re-assessment to demonstrate compliance with the requirements of the
EN 60079 series of standards, the documents originally listed in section 9, EN 50014:1997
(amendments A1 to A2) and EN 50016:1995 were replaced by EN 60079-0:2006, EN 60079-1:2004,
EN 61241-0:2006 and EN 61241-1:2006, the markings in section 12 were updated accordingly.
The removal of special conditions for safe use that were not specifically associated with the
equipment covered by this certificate.
Variation 4 - This variation introduced the following change:
ii.
i.
Variation 3 This variation introduced the following changes:
EC TYPE-EXAMINATION CERTIFICATE
SCHEDULE
This MiniPurge Control Unit shall be incorporated into equipment and the appropriate Conformity
Assessment Procedures applied to the combination as defined by Directive 94/9/EC. This certificate
does not cover the combination.
The purge controller, low temperature version, shall be protected by a safety related system that
ensures that it cannot be energised if the temperature of the controller logic air or purge controller falls
below -20°C. This system shall utilise the RTDs that are fitted to the purge controller to provide the
appropriate level of system integrity, i.e. a level of operational safety of Cat 3 according to EN 954-1 for
ATEX Category 2 (Zone 1) applications; note that these RTDs have not been assessed as a safety
related device in accordance with EHSR 1.5 of Directive 94/9/EC.
15.4
15.5
Form 9400 Issue1
Page 6 of 7
The values of the safety parameters shall be set in accordance with the equipment certificate that
covers the combination of the pressurised enclosure(s) and MiniPurge Control Unit.
15.3
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
The installer/user shall ensure that the MiniPurge Control Unit is installed in accordance with the equipment
certificate that covers the combination of the pressurised enclosure(s) and MiniPurge Control Unit.
15.2
This certificate and its schedules may only be
reproduced in its entirety and without change.
When using the AO, AS and DT options, the recommendations for the additional requirements of Ex p
apparatus contained within EN 60079-14 shall be applied.
R25983A/00
R29097A/00
R70012182A
Comment
The release of prime certificate.
The introduction of Variation 1.
The introduction of Variation 2.
The re-issue of Variation 2 to include the changes
described in report number R51A15629A.
This Issue covers the following changes:
• All previously issued certification was rationalised
into a single certificate, Issue 4, Issues 0 to 3
referenced above are only intended to reflect the
history of the previous certification and have not
been issued as documents in this format.
• The introduction of Variation 3.
The introduction of Variation 4.
This Issue covers the following changes:
• This certificate history was modified to recognise
that that Variation 2 was re-issued, subsequent
Variations have therefore been re-numbered.
• The introduction of Variation 5.
The introduction of Variation 6.
The introduction of Variation 7.
The introduction of Variation 8.
SPECIAL CONDITIONS FOR SAFE USE (denoted by X after the certificate number)
07 December 2011
05 October 2012
10 July 2015
R51L19695A
R23665A/00
R51L15966B
Report no.
R53A7169A
R53V11342A
R51A11080A
R51A15629A
15
7
8
9
18 February 2009
22 December 2010
7 June 2007
4
5
6
Date
3 July 2002
29 March 2004
30 September 2004
19 September 2006
Issue
0
1
2
3
Associated Sira Reports and Certificate History
Refer to Certificate Annexe.
Drawings
DESCRIPTIVE DOCUMENTS
Sira 01ATEX1295X
Issue 9
15.1
14.2
14.1
14
EC TYPE-EXAMINATION CERTIFICATE
SCHEDULE
Page 31
ML434 | v12l
The use of this certificate is subject to the Regulations Applicable to Holders of Sira Certificates.
Holders of Type Examination Certificates are required to comply with the production control
requirements defined in Article 8 of directive 94/9/EC.
The switches incorporated in the PA option shall be suitably certified for Category 2.
The following routine tests shall be performed by the manufacturer:
17.2
17.3
17.4
Form 9400 Issue1
Page 7 of 7
The Purge Controllers: Sub-MiniPurge, MiniPurge, Super-MiniPurge, Super-MiniPurge 1800/3500/7000/7000X
shall not be marked as suitable for use in explosive dust atmospheres when a non-metallic or painted
housing is used.
17.7
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
The certification code that is appropriate to Purge Controllers low temperature version shall appear in
the product marking applied to outer stainless steel enclosure.
17.6
This certificate and its schedules may only be
reproduced in its entirety and without change.
The products covered by this certificate incorporate previously certified devices, it is therefore the
responsibility of the manufacturer to continually monitor the status of the certification associated with
these devices, and the manufacturer shall inform Sira of any modifications of the devices that may
impinge upon the explosion safety design of the products.
17.5
Where the HP is specified an overpressure shall be simulated whilst the MiniPurge Control Unit is
cycling, it shall be verified that the controller provides the appropriate output and resets.
Verification of Purging Overpressure protection
An air supply failure shall be simulated whilst the MiniPurge Control Unit is cycling, it shall be verified
that the controller provides the appropriate output and resets.
Verification of Air Supply Failure Protection
A purge failure shall be simulated whilst the MiniPurge Control Unit is cycling, it shall be verified that
the controller provides the appropriate output and resets.
Verification of Purge Failure Protection
An overpressure loss shall be simulated whilst the MiniPurge Control Unit is cycling, it shall be verified
that the controller provides the appropriate output and resets.
Verification of Minimum Overpressure Cut Off
CONDITIONS OF CERTIFICATION
17.1
The relevant EHSRs that are not addressed by the standards listed in this certificate have been
identified and individually assessed reports listed in Section 14.2.
ESSENTIAL HEALTH AND SAFETY REQUIREMENTS (EHSRs)
Sira 01ATEX1295X
Issue 9
17
16
EC TYPE-EXAMINATION CERTIFICATE
SCHEDULE
Purge Controllers
Sub-MiniPurge, MiniPurge, Super-MiniPurge,
Super-MiniPurge 1800/3500/7000/7000X
EXPO Technologies Limited
Equipment:
Applicant:
Sheet
1 to 4
1 to 2
1 of 1
1 of 1
1 of 1
Rev.
3
2
1
1
1
Date
02 Jul 02
21 May 01
21 Sep 00
21 Sep 00
21 Sep 00
Description
MiniPurge ATEX Certification Labelling
MiniPurge ATEX Certification Type Numbering Scheme
MiniPurge, Continuous Flow with /HP Sensor –Schematic diagram
RLV, outlet orifice
Outlet Valve Control Circuit Diagram
Sheet
1 of 1
Rev.
3
Date
Description
22 March 04 Low Temperature Housing - General Arrangement
Description
Certification label
Low temperature housing wiring certification drawing.
Sheet
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 to 2
1 to 2
Sheet
1 to 5
Rev.
02
03
02
02
02
02
02
03
03
02
02
02
02
01
01
01
01
02
01
04
06
03
Rev.
5
Date
15 Mar 07
09 Jul 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
18 Apr 07
27 Mar 07
15 Mar 07
25 Apr 07
15 Mar 07
20 Feb 07
20 Feb 07
Date
30 Aug 06
Form 9400 Issue 1
This certificate and its schedules may only be
reproduced in its entirety and without change.
Number
EP99-3-1
EP99-2-1
EP99-2-3
EP99-2-2
EP99-2-7
EP99-2-8
EP99-2-9
EP99-2-10
EP99-2-11
EP99-2-12
EP99-2-14
EP99-2-17
EP99-2-16
SD7533
SD7535
SD7536
SD7538
SD7449
SD7500
SD7448
SD7281
SD7282
Issue 4
Number
SD7281
Page 1 of 2
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
Description
Minipurge Control Unit – General Assembly
Schematic - Type x Leakage Compensation
Sequence Diagram - Type x Leakage Compensation
Schematic - Type x Continuous Flow
Schematic – Separate Supply and Mechanical Timer
Schematic – Delay Before Trip and On/Off
Schematic – Twin Output and Manual Override
Schematic – Pressure Control Leakage Compensation
Internal “IS” Switches
Schematic – Containment System and Secondary pressurisation
Schematic – Continuous Flow with 2 Flow Rates
Schematic – Continuous Flow with High Pressure
Schematic – Outlet Valve Control
Schematic – Dust Protection
Spark Arrestor
Differential Flow Monitor
Continuous Flow Outlet Orifice
Wiring Diagram – Low temperature
Outlet Orifice Closing Device
Low Temperature Housing
Certification Label Details
MiniPurge Data Sheet
Description
Certification label
Issue 3 (The drawings associated with this issue were replaced by those listed in Issue 4)
Number
Sheet
Rev.
Date
SD7281*
1 to 5
4
17 Dec 03
SD7449
1 of 1
1
18 Dec 03
* Modified by Sira 30 September 2004
Issue 2 (The drawings associated with this issue were replaced by those listed in Issue 4)
Number
SD7448
Issue 1 (The drawings associated with this issue were replaced by those listed in Issue 4)
Number
SD7281
SD7282
EP/99-2-17
EP99-7-7
EP99-7-9
Issue 0 (The drawings associated with this issue were replaced by those listed in Issue 4)
Sira 01ATEX1295X
Certificate Number:
Certificate Annexe
ML434 | v12l
Page 32
Sheets
1 to 3
1 to 3
1 to 2
1 to 7
1 of 1
1 of 1
Sheets
1 to 3
Sheets
1 of 1
1&2
1 to 3
1 of 1
Sheets
1 to 2
1 to 2
1 of 1
1 of 1
Sheets
1 to 2
1 of 1
Rev.
10
11
6
1
8
2
Rev.
10
Rev.
6
5
9
2
Rev.
8
4
2
2
Rev.
7
05
Date (Sira stamp)
22 Jun 15
22 Jun 15
22 Jun 15
22 Jun 15
22 Jun 15
22 Jun 15
Date (Sira stamp)
05 Oct 12
Date (Sira stamp)
23 Nov 11
23 Nov 11
23 Nov 11
23 Nov 11
Date (Sira stamp)
23 Dec 10
21 Dec 10
21 Dec 10
21 Dec 10
Form 9400 Issue 1
Page 2 of 2
Title
Low Temperature Housing
MiniPurge Certification Label
MiniPurge Data Sheets
MiniPurge Manual Extracts
Low Temperature Wiring
Local Sensing Option
Title
Minipurge Certification Label
Tel:
Fax:
Email:
Web:
+44 (0) 1244 670 900
+44 (0) 1244 539 301
ukinfo@csagroup.org
www.csagroupuk.org
Unit 6, Hawarden Industrial Park,
Hawarden, CH5 3US, United Kingdom
Sira Certification Service
Description
Minipurge Low Temperature Housing
Minipurge Data Sheets
Minipurge ATEX/IECEx Certification Label
Minipurge Dust Protection Schematic
Description
Minipurge ATEX/IECEx Certification Label
MiniPurge Data Sheet
MiniPurge electronic timer
MiniPurge HP sensor
Description
Minipurge ATEX/IECEx Certification Label
Minipurge Low temperature Housing
Description
Fault Evaluation
Outlet Valve Circuit N/O
Outlet Control Valve N/C
Schematic – Type Z or Y leakage compensation
Schematic Type Z or Y Continuous Flow
Sequence Diagram – Type X Continuous Flow
Schematic – Alarm only and Alarm Action Selector
Schematic – Door Switch Active Alarm and Alarm Cancel
RLV Configurations
Alternative Z&Y LC System
Alternative Z&Y LC System
Date (Sira stamp)
12 Feb 09
12 Feb 09
Date
20 Feb 07
15 Mar 07
15 Mar 07
09 Jul 07
15 Mar 07
15 Mar 07
15 Mar 07
15 Mar 07
05 Jul 07
09 Jul 07
09 Jul 07
This certificate and its schedules may only be
reproduced in its entirety and without change.
Number
SD7448
SD7281
SD7282
SD8196
SD7449
SD8158
Issue 9
Number
SD7281
Issue 8
Number
SD7448
SD7282
SD7281
SD7533
Issue 7
Number
SD7281
SD7282
SD7913
SD7914
Issue 6
Number
SD7281
SD7448
Issue 5
Rev.
01
02
01
02
01
02
02
02
01
01
01
EXPO Technologies Limited
Applicant:
Number
SD7537
EP99-7-9
EP99-7-9
SD7531
SD7532
EP99-2-4
EP99-2-5
EP99-2-6
SD7555
SD7556
SD7556
Purge Controllers
Sub-MiniPurge, MiniPurge, Super-MiniPurge,
Super-MiniPurge 1800/3500/7000/7000X
Sira 01ATEX1295X
Equipment:
Sheet
1 to 3
1 of 2
2 of 2
1 of 1
1 of 1
1 of 1
1 of 1
1 of 1
1 to 4
1 of 2
2 of 2
Certificate Number:
Certificate Annexe
Page 33
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Page 34
Page 35
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Page 37
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Page 38
MiniPurge Interface Unit MIU/e
User Instruction Manual
Manufacturer:
Model Type & Rating:
Certificates:
Hazardous Area Marking
Code:
Expo Technologies Ltd, Unit 2 The Summit, Sunbury on Thames. UK.
MIU/e1
MIU/e2
MIU/e1/MO
400V / 7A
400V / 7A
400 V / 2A
IECEx ITS10.0003X
Ex e IIC T5 Gb
Ex tb IIIC T100°C Db IP66
Tamb -20°C to +55°C
Ex e IIC T4 Gb
Tamb -20ºC to +60ºC
ITS 10ATEX37092X
II 2 G D
Ex e IIC T5 Gb
Ex tb IIIC T100°C Db IP66
Tamb -20°C to +55°C
II 2 G D
Ex e IIC T4 Gb
Tamb -20°C to +60°C
TUV 12.1463
Ex e IIC T5 Gb
Ex tb IIIC T100ºC Db IP66
Tamb -20°C to +55°C
Ex e IIC T4 Gb
Tamb -20°C to +60°C
APPLICATION SUITABILITY
The MiniPurge Interface Units – MIU/e are certified for use in Hazardous Areas where the Hazardous Area is non-mining
(i.e. above ground) and the hazard is caused by flammable gasses or vapours.
The systems may be used in ATEX/IECEx Gas Zones 1 & 2, Gas Groups IIA, IIB & IIC and in Dust Zones 21 & 22, Dust
Groups IIIA, IIIB & IIIC.
The following materials are used in the construction of MIU/e: Stainless Steel, Steel, Brass, Copper, Polyamide, Silicone.
If substances that will adversely affect any of these materials are present in the surrounding environment, please consult
Expo Technologies for further guidance. This equipment is designed for use under normal industrial conditions of ambient
temperature, humidity and vibration. Please consult Expo Technologies before installing this equipment in conditions that
may cause stresses beyond normal industrial conditions.
WARNING - Only install, commission, inspect, maintain or fault find when safe to do so.
INSTALLATION
The MIU/e shall be installed in accordance with relevant standards, such as EN 60079-14 and any local codes of practice
that are in force. Cable glands or other cable entry devices shall be appropriately certified and suitable for the cable and
the conditions of use and be installed in accordance with the manufacturer’s instructions.
The MIU/e shall be connected to the Purge and Pressurization system in accordance with the instructions given in the
handbook supplied with the pressurization system.
The external earth connection of the MIU/e shall be connected to earth using minimum 4mm2 conductor.
TERMINALS
MIU/e may be fitted with a combination of:
WDU2.5 terminals certified to KEMA 98ATEX1683U & IECEx ULD05.0008U
SAK2.5 terminals certified to KEMA 98ATEX1798U & IECEx KEM06.0014U
WPE2.5 Earth terminals certified to KEMA 98ATEX1683U & IECEx ULD05.0008U
For all type of terminals:
Tightening torque range: 0.4 to 0.8 Nm (WDU & WPE) & 0.4 to 0.6 Nm (SAK)
Conductor cross section maximum 2.5 mm2, minimum 1.5 mm2
Type of connection is screwed - Solid copper conductors to be used.
Stripping length shall be 10 mm.
Only one conductor is allowed at each side of a terminal. Multiple conductors shall be crimped together before screwed
into the terminal.
Maximum number of terminals:
For Model MIU/e1 – Up to 18 current carrying terminals
For Model MIU/e2 – Up to 33 current carrying terminals
For Model MIU/e1/MO – Up to 13 current carrying terminals
COMMISSIONING
The installation of the cable glands, electrical and earth connections shall be inspected for correct installation before the
unit is put into service. The lid shall be correctly fitted.
MAINTENANCE
The condition of enclosure and associated cable glands shall be inspected for damage every six months. The terminals
shall be inspected for tightness and gaskets inspected for damage.
FAULT FINDING
When wiring or signal fault occurs, check each terminated wire, terminals for tightness and gaskets for damage.
External faults such as broken switches within the Control Unit may also require investigation.
ML358 v7
Page 1 of 1
Page 39
18-Feb-16
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ML434 | v12l
Page 48
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With
European
Directives
EC-Declaration of
Conformity
Expo Technologies Ltd
Unit 2, The Summit, Hanworth Road
Sunbury on Thames TW16 5DB, UK
This is to declare that
Purge Controllers Type “MiniPurge”
are manufactured in conformity with the following
European Directives and standards:
Electromagnetic Compatibility Directive 2004/108/EG
MiniPurge Systems with a /PO suffix in the type number are non-electrical and are outside the scope
of the EMC Directive.
MiniPurge Systems with suffices /PA or /IS incorporate one or more volt-free (“dry”) contacts which
work in circuits specified by others. In normal operation these circuits are “benign” and no CE mark is
appropriate.
MiniPurge Systems with Electronic Timer (Option /ET) are designed to conform to the EMC Directive,
in compliance with EN 61000-6-4:2007 and EN 61000-6-2:2005 (Intertek Report EM10048000).
Low Voltage Directive 2006/95/EC
MiniPurge Systems are intended for use in potentially explosive atmospheres (Hazardous Areas) and
are therefore excluded from the Low Voltage Directive.
Pressure Equipment Directive 97/23/EC
MiniPurge Systems are classified as not higher than category I under Article 9 of this Directive and
intended for use in potentially explosive atmospheres (Hazardous Areas) and are therefore excluded
from the Pressure Equipment Directive.
ATEX Directive 94/9/EC
MiniPurge Systems are designed to conform to the ATEX Directive, in compliance with:
EN 60079-0 : 2012 + A11:2013
EN 60079-2 : 2014
MiniPurge Systems are certified by SIRA Certification Service, Rake Lane, Eccleston, Chester CH4 9JN,
England, under EC Type-Examination Certificate SIRA 01ATEX1295X, in compliance with:
EN 60079-0 : 2012
EN 60079-2 : 2014
According to the model, MiniPurge Systems are rated and shall be marked as follows:
MiniPurge, X & Y models
MiniPurge, Z models
Group II Category 2G & 2D
Group II Category 3G & 3D
II 2(2) GD
II 2(3) GD
MiniPurge systems are manufactured under Production Quality Assurance Notification
SIRA 99 ATEX M043, issued by SIRA Certification Service, Notified Body No 0518.
John Paul de Beer
Managing Director
Date 25/09/2015
Confidential Assessment file reference SC004
S:\Files\QA\CERTS\C-OF-C\Minipurge CE SC004 Issue7.doc
ML434 | v12l
Page 50
Expo Technologies Ltd.
Unit 2 The Summit
Hanworth Road
Sunbury on Thames
TW16 5DB
UK
Expo Technologies Inc.
9140 Ravenna Road Unit #3
Twinsburg
OH 44087
USA
Tel:
Fax:
E-mail:
+44(0)20 8398 8011
+44(0)20 8398 8014
sales@expoworldwide.com
Tel:
Fax:
E-mail:
+1 (440) 247 5314
+1 (330) 487 0611
sales.na@expoworldwide.com
www.expoworldwide.com