00_atex_U1_U4_200606_en.FH10 Tue Jul 11 13:27:40 2006
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Overview • July 2006
Explosion Protection (ATEX)
Fundamentals
low-voltage
CONTROLS AND DISTRIBUTION
The full range of Ex applications under control:
ATEX (atmosphère explosive)
Introduction
In many industries, the manufacture, processing, transport, or storage of combustible materials results in the
creation, or release into the surrounding environment, of
gases, vapors, or mist. Other processes create combustible
dust. An explosive atmosphere can form in conjunction
with the oxygen in the air, resulting in an explosion if ignited.
Particularly in areas such as the chemical and petrochemical
industries, the transport of crude oil and natural gas, the
mining industry, milling (e.g. grain and granular solids) and
many other branches of industry, this can result in serious
injury to personnel and damage to equipment.
To guarantee the highest possible level of safety in these
areas, the legislatures of most countries have developed
appropriate obligations in the form of laws, regulations and
standards. In the course of globalization, it has been possible
to make significant progress towards harmonizing guidelines
for explosion protection.
With the Directive 94/9/EU the European Union creates the
prerequisites for complete standardization because all new
devices must be approved in accordance with this directive
since July 1, 2003.
The brochure "Explosion Protection Fundamentals" is designed
to provide users and interested readers with an overview of
explosion protection in conjunction with electrical equipment
and systems. It also assists in decoding device labels.
However, it does not replace intensive study of the relevant
fundamentals and guidelines when planning and installing
electrical systems.
2
Introduction
Index
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Physical principles and parameters . . . . . . . . . . . . . 4
Classification of
explosion-protected equipment . . . . . . . . . . . . . . . 8
Low-voltage product range for hazardous areas . 13
Further information . . . . . . . . . . . . . . . . . . . . . . . . . 20
Introduction
3
Physical fundamentals and parameters
Explosion
Primary and secondary explosion protection
An explosion is the sudden chemical reaction of a combustible
substance with oxygen, involving the release of high energy.
Combustible substances can be present in the form of gases,
mist, vapor, or dust. An explosion can only take place if the
following three factors coincide:
The principle of integrated explosion protection requires all
explosion protection measures to be carried out in a defined
order.
A distinction is made here between primary and secondary
protective measures.
1. Combustible substance
(in the relevant distribution and concentration)
Primary explosion protection covers all measures that prevent
the formation of a potentially explosive atmosphere.
2. Oxygen (in the air)
What protective measures can be taken to ensure that the risk
of an explosion will be minimized?
3. Source of ignition (e.g. electrical spark)
■
Avoidance of combustible substances
■
Inerting (addition of nitrogen, carbon dioxide, etc.)
■
Limiting of the concentration
■
Improved ventilation
Secondary explosion protection is required if the explosion
hazard cannot be removed or can only be partially removed
using primary explosion protection measures.
Integrated explosion protection
Oxygen
EXPLOSION
Combustible
substances
4
Ignition source
Physical fundamentals and parameters
1
Prevent the formation
of potentially
explosive atmospheres
2
Prevent the ignition
of potentially explosive
atmospheres
3
Restrict the effects
of an explosion
to a negligible level
The consideration of technical safety parameters is necessary
for the characterization of potential dangers:
The explosion limits depend on the surrounding pressure and
the proportion of oxygen in the air (see the table below).
Flash point
We refer to a deflagration, explosion, or detonation, depending on the speed of combustion.
The flash point for flammable liquids specifies the lowest
temperature at which a vapor-air mixture forms over the
surface of the liquid that can be ignited by a separate source.
If the flash point of such a flammable liquid is significantly
above the maximum occurring temperatures, a potentially
explosive atmosphere cannot form there. However, the flash
point of a mixture of different liquids can also be lower than
the flash point of the individual components.
In technical regulations, flammable liquids are divided into
four hazard classes:
Hazard class
Flash point
AI
< 21 °C
AII
21 °C to 55 °C
AIII
> 55 °C to 100 °C
B
< 21 °C, soluble in water at 15 °C
Explosion limits
Combustible substances form a potentially explosive
atmosphere when they are present within a certain range of
concentration.
If the concentration is too low (lean mixture) and if the
concentration is too high (rich mixture) an explosion does not
take place. Instead slow burning takes place, or no burning at
all.
Only in the area between the upper and the lower explosion
limit does the mixture react explosively if ignited.
A potentially explosive atmosphere is present if ignition represents a hazard for personnel or materials.
A potentially explosive atmosphere, even one of low volume,
can result in hazardous explosions in an enclosed space.
Substance
designation
Lower explosion
limit [Vol. %]
Upper explosion
limit [Vol. %]
Acetylene
2.3
Ethylene
Petrol
Benzene
Natural gas
Heating oil/diesel
Methane
Propane
Carbon bisulfide
City gas
Hydrogen
2.3
~ 0.6
1.2
4.0 (7.0)
~ 0.6
4.4
1.7
0.6
4.0 (6.0)
4.0
78.0
(self-decomposing)
32.4
~8
8
13.0 (17.0)
~ 6.5
16.5
10.9
60.0
30.0 (40.0)
77.0
Explosion limits of combustible substances
100 Vol.%
Air concentration
Mixture too lean:
No combustion
G
Area subject
to explosion
0 Vol.%
Mixture too rich:
Partial deflagration
No explosion
Explosion limit
0 Vol.%
Concentration of combustible substance
100 Vol.%
Physical fundamentals and parameters
5
Physical fundamentals and parameters
Dust
In industrial environments, e.g. in chemical factories or corn
mills, solids are frequently encountered in fine form – e.g. as
dust.
Dust is defined in EN 50281-1-21) as "small solid particles in
the atmosphere which are deposited because of their own
weight, but which still remain in the atmosphere for a period
of time as a dust/air mixture". Deposits of dust are comparable
with a porous body, and have a hollow space of up to 90 %. If
the temperature of dust deposits is increased, the result may
be spontaneous ignition of the combustible dust.
If dust deposits with a small grain size are whirled up, there is
a danger of explosion. This increases as the size is reduced,
since the surface area of the hollow space becomes larger.
Dust explosions are frequently the result of whirled up glowing layers of dust which possess the basis for ignition. Explosions of gas or vapor mixtures with air can whirl up dust where
the gas explosion then merges into a dust explosion. In collieries, explosions of methane gas frequently lead to explosions
of coal dust whose effect was often greater than that of the
gas explosion.
1)
Parallel to DIN 50281 there is already EN 61241-1.
6
Physical fundamentals and parameters
The danger of an explosion is prevented by using explosionproof devices according to their suitability. The identification
of the device category reflects the efficiency of explosion protection, and thus the application in corresponding hazardous
areas. The danger of explosive dust atmospheres and the
selection of appropriate protective measures are assessed
using safety parameters for the involved substances. Dusts are
considered according to two substance-specific properties:
■
Conductivity
Dusts are referred to as conductive if they have a specific
electric resistance up to 103 Ohmmeter.
■
Combustibility
Combustible dusts can burn or glow in air, and form explosive mixtures with air at atmospheric pressure and at
temperatures from – 20 °C to + 60 °C.
Safety parameters for whirled-up dusts are, for example, the
minimum ignition energy and the ignition temperature,
whereas for deposited dusts, the glow temperature is a
characteristic property.
Minimum ignition energy
The application of a certain amount of energy is required to
ignite a potentially explosive atmosphere.
The minimum energy is taken to be the lowest possible
converted energy, for example, the discharge of a capacitor,
that will ignite the relevant flammable mixture.
Minimum ignition energy
(mJ)
1000
rare
100
The minimum energy lies between approximately 10-5 J for
hydrogen, and several Joules for certain dusts.
What can cause ignition?
■
Hot surfaces
■
Adiabatic compression
■
Ultrasound
■
Ionized radiation
■
Open flames
■
Chemical reaction
■
Optical radiation
■
Electromagnetic radiation
■
Electrostatic discharge
■
Sparks caused mechanically by friction or impact
■
Electrical sparks and arcs
Welding sparks,
sheaf of
impact sparks in mills
Sheaf of
grinding sparks
10
1
rare
rare
electrostatic
discharges,
impact sparks
0.1
0.01
Gases
Dusts
Practice-oriented
ignition source
Physical fundamentals and parameters
7
Classification of explosion-proof equipment
Identification
The identification of electrical equipment for hazardous
areas should permit recognition of:
■
The vendor of the equipment
■
A designation by which it can be identified
■
The area of use
■
- Below ground I
- Other areas II
Gases and vapors - G -, dusts - D - or mines - M -,
■
The categories which indicate whether the device can be
used for particular zones,
Example
■
The type(s) of protection with which the equipment
complies,
■
The testing agency which provided the test certificate, the
standard (or its release version) with which the equipment
complies – including the testing agency’s registration
number of the certificate and, if necessary, any special
conditions which have to be observed.
■
In addition, the data should be provided which are usually
required for such a device of industrial design.
Meaning
> 0032
II 2D
IP65
T 80°C
Temperature range
Housing protection class
Ex protection zone
Named agency for certification of the QA system according to directive 94/9/EC
Conformity symbol
Example of identification according to directive 94/9/EC
Example
Meaning
EXAMPLE COMPANY type 07-5103-.../...
Identification of vendor and type
Manufactured according to EN 61241-.-.
Protected by enclosure, IP65 degree of protection
Max. surface temperature + 80 °C
Ex II 2D IP65 T 80°C
IBExU
00
ATEX
1081
Consecutive number of testing agency
ATEX generation
Year of test
Symbol of testing agency
Example of a device identification
8
Classification of explosion-proof equipment
Device groups/categories
Zones
Devices are classified into device groups:
Areas subject to explosion hazard are divided into zones. Division into zones depends on the chronological and geographical probability of the presence of a hazardous, potentially
explosive atmosphere.
■
Device group I
- in underground operations
- in mines as well as open-cast operations
- and their surface installations
■
Information and specifications for zone subdivision can be
found in EN/IEC 60079-10.
Device group II
- Devices for use in the other areas
Each device group contains equipment that is in turn assigned
to different categories (Directive 94/9/EC). The category specifies the zone in which the equipment may be used.
Device group
Device category
Zone
I
Mining
Mine gas and/or flammable dusts
M = Mining
M1
M2
---
II
Other areas
Potentially explosive atmosphere
G = Gas
1G
2G
3G
0, 1, 2
1, 2
2
D = Dust
1D
2D
3D
20, 21, 22
21, 22
22
Explanation of the device categories:
M 1, 1 G,
1D
Extremely high level of safety = device safety must be guaranteed even in the case of rare device faults,
e.g. simultaneous fault in two devices.
M 2, 2 G,
2D
High level of safety = device safety must be guaranteed in the case of frequent device faults,
e.g. fault in one device.
3 G,
3D
Normal level of safety = device safety must be guaranteed in the case of fault-free operation.
Explanation of the zones:
0, 20
It is to be expected that a hazardous, potentially explosive atmosphere will occur continuously, often and over extended periods.
1, 21
It is to be expected that a hazardous, potentially explosive atmosphere will only occur occasionally.
2, 22
It is to be expected that a hazardous, potentially explosive atmosphere will occur only rarely and then only for a short period.
Connection between device group, device category and zone
Many low-voltage controlgear and switching devices, e.g.
overload relays and motor starter protectors are intended for
switching and controlling equipment in explosive atmospheres while being positioned outside.
These devices are labeled with the category of the equipment
to be protected. The category, however, is written in round
brackets, e.g.: Ex II (2) GD
Classification of explosion-proof equipment
9
Classification of explosion-protected equipment
Types of protection
The protection types are design measures and electrical
measures carried out on the equipment to achieve explosion
protection in the areas subject to explosion hazard.
Protection types are secondary explosion protection measures. The scope of the secondary explosion protection measures depends on the probability of the occurrence of a hazardous, potentially explosive atmosphere.
Electrical equipment for areas subject to explosion hazard
must comply with the general requirements of EN 60079-0
and the specific requirements for the relevant type of protection in which the equipment is listed. However, the type of
protection "Protection by housing" does not refer to
EN 60079-0, but to EN 61241-0.
The types of protection listed on the following pages are significant in accordance with EN 60079-0. All types of protection
are based on different protection concepts.
Gases – Types of protection
Type of
L = Label
protection
Schematic
representation
General
requirements
Increased
safety
Application
in zone
Basic principle
Standard
Examples
1
2
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
General requirements for the type and
EN 60079-0
testing of electrical equipment intended for
the Ex area.
Applies only to equipment, or its component parts, that normally does not create
sparks or arcs, does not attain hazardous
temperatures, and whose mains voltage
does not exceed 1 kV.
EN 60079-7
IEC 60079-7
FM 3600
UL 2279 REPG
Terminals,
connection
boxes
Flamed
proof
enclosure
If an explosion occurs inside the enclosure,
the housing will withstand the pressure
and the explosion will not be propagated
outside the enclosure.
EN 60079-1
IEC 60079-1
FM 3600
UL 2279 REPG
Switchgear,
transformers
Pressurp
ized
enclosure
The ignition source is surrounded by a
pressurized (minimum 0.5 mbar) protective
gas – the surrounding atmosphere cannot
enter.
EN 60079-2
IEC 60079-2
FM 3620
NFPA 496
Control cabinets,
switching
cabinets
Intrinsic
safety
By limiting the energy in the circuit, the for- EN 50020
mation of impermissibly high temperatures IEC 60079-11
sparks, or arcs is prevented.
FM 3610
UL 2279 REPG
Actuators,
sensors,
PROFIBUS DP
RS 485-iS
Oil
o
immersion
Equipment or equipment parts are imEN 50015
mersed in oil and thus separated from the IEC 60079-6
Ex atmosphere.
FM 3600
UL 2279 REPG
Transformers,
switchgear
Sand
filling
q
Ignition source is buried in sand. The Ex
EN 50017
atmosphere surrounding the housing can- IEC 60079-5
not be ignited by an arc.
FM 3600
UL 2279 REPG
Heater strips,
capacitors
Molding
m
By embedding the ignition source in a
molding, it cannot ignite the Ex atmosphere.
Sensors,
switchgear
e
i
Protection n
types
10
0
Zone 2:
This protection type
comprises several
types of protection
EN 60079-18
IEC 60079-18
FM 3600
UL 2279 REPG
Slightly simplified application of the other EN 60079-15
Zone-2 protection types – "n" stands for
IEC 60079-15
"non-igniting".
Classification of explosion-proof equipment
Programmable
controllers
■
Dusts – Types of protection
Application
in zone
Type of
protection
Label
Basic principle
Pressurized
enclosure
pD
Molding
mD
Standard
Examples
20
21
22
The penetration of a surrounding atmosphere into the en- EN 502811)
closure of electrical equipment is prevented in that a pro- IEC 61241
tective gas (air, inert gas or other suitable gas) is kept within
the enclosure at a pressure higher than the surrounding
atmosphere.
Equipment where
sparks, arcs or hot
components occur
in normal operation
■
■
■
Parts which could ignite an explosive atmosphere through EN 502811)
sparks or warming-up are potted in a casting compound
IEC 61241
such that the explosive atmosphere cannot ignite. This is
achieved by surrounding the components on all sides by a
casting compound which is resistant to physical (in particular electrical, thermal and mechanical) and chemical influences.
Large machines,
slipring or collector
motors, switchgear
and control cabinets
■
■
■
Protection by
enclosure
tD
The enclosure is sealed so tight that no combustible dust
EN 502811)
can penetrate into it. The surface temperature of the exter- IEC 61241
nal enclosure is limited.
Measuring and
monitoring systems
■
■
■
Intrinsic
safety
iaD, ibD
Current and voltage are limited such that intrinsic safety is EN 502811)
guaranteed. No sparks or thermal effects can ignite a
IEC 61241
dust/air mixture.
Sensors and
actuators
■
■
■
Explosion groups
Determination of explosion group
In the explosion groups, a distinction is first made between
equipment of Group I and of Group II:
A gas is present both inside and outside a flame-proof
enclosure. The gas inside the explosion chamber is ignited.
Electrical equipment of Group I is used for mines subject to
fire-damp.
Result:
If an ignition inside the explosion chamber is not transferred
through the gap of defined width to the outside, the explosion
group has been determined.
A further division into explosion groups is made for the electrical equipment of Group II. The division depends on the spark
ignition capability through a gap of defined width and length
(according to EN 60079-14).
Gap length
Explosion chamber
Electrical equipment with approval for explosion group IIC may
also be used in explosion groups IIA and IIB.
Explosion group
Use
Group I
Electrical equipment for
mines subject to fire-damp
==> fire-damp protection EEx...I
Group II
Electrical equipment for all other areas
subject to explosion hazard
==> explosion protection EEx...II
Gap
width1)
Potentially explosive
atmosphere
1)
2)
Explosion group
Gap width limits for
flameproof
enclosure2)
IIA
> 0.9 mm
IIB
0.5 mm to 0.9 mm
IIC
< 0.5 mm
Degree of
hazard
Equipment
requirements
low
Parallel to DIN 50281 there is already EN 61241-1.
The gap width limit is the width between two 25-mm long,
parallel flange surfaces of an explosion chamber.
low
high
high
Classification of explosion-proof equipment
11
Classification of explosion-protected equipment
Temperature classes
The ignition temperature of flammable gases or a flammable
liquid is the lowest temperature of a heated surface at which
the gas/air or vapor/air mixture ignites.
Thus the highest surface temperature of any equipment must
always be less than the ignition temperature of the surrounding atmosphere.
Temperature classes T1 to T6 have been introduced for electrical equipment of Explosion Group II. Equipment is assigned to
each temperature class according to its maximum surface
temperature.
Equipment that corresponds to a higher temperature class can
also be used for applications with a lower temperature class.
Explosion
group
Temperature classes
I
Methane
II A
T1
Flammable gases and vapors are assigned to the relevant temperature class according to ignition temperature.
Temperature
class
Maximum upper
surface temperature of the
equipment
Ignition
temperatures of
combustible
substances
T1
450 °C
> 450 °C
T2
300 °C
> 300 °C
T3
200 °C
> 200 °C
T4
135 °C
> 135 °C
T5
100 °C
> 100 °C
T6
85 °C
> 85 °C
T2
T3
T4
Acetone
Ethane
Ethylacetate
Ammonia
Benzene (pure)
Ethanoic acid
Carbon monoxide
Carbon oxide
Methane
Methanol
Propane
Toluol
Ethyl alcohol
i-amyl acetate
n-butane
n-butylalcohol
Petrol
Diesel fuel
Aircraft fuel
Heating oils
n-hexane
Acetylaldehyde
Ethylether
II B
City gas
(illuminating gas)
Ethylene
II C
Hydrogen
Acetylene
Classification of gases and vapors into explosion groups and temperature classes
12
Classification of explosion-proof equipment
T5
T6
Carbon bisulfide
Product range of
Low-voltage controls and distribution
for potentially explosive areas
Systems
AS-Interface – consistent system, superior strategy
As a cost-effective and robust bus system at field level, AS-Interface connects –
open and manufacturer-independent – actuators and sensors to control – for
standard as well as safety applications. A serial field bus connects all
automatization components easily, safely and consistently.
The ATEX-certified K60 compact modules make the application of AS-Interface possible
even in potentially explosive areas.
Type
Digital I/O modules
IP67 – K60
Series Certificate number
3RK1 400-1DQ05-0AA3, K60
3RK1 200-0CQ05-0AA3
ATEX 2705
Certification
based on
Type of
protection/
Identification
EN 60947-5-2, Ex II (3) D X
EN 50281-1-1
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 2.
Low-voltage controls and distribution for potentially explosive areas
13
Product range of
Low-voltage controls and distribution
for potentially explosive areas
Protecting1)
SIRIUS motor starter protectors for motor protection
3RV motor starter protectors are compact, current limiting motor starter protectors. They
guarantee safe disconnection in the event of a short circuit and protect consumers and plants
from overload. Moreover, they are suitable for normal switching of loads with low switching
frequency as well as for the safe disconnection of the plant from the mains during maintenance
or changes. SIRIUS 3RV is the only universal product family on the market for motor starter protectors up to 100 A.
Motor starter protectors for
motor protection
Type
Size
Certificate number
Certification
based on
3RV10 11
S00
3RV10 21
S0
DMT 02 ATEX F 001,
IEC 60947-4-1,
DMT 02 ATEX F 001 N1 EN 60079-14
3RV10 31
S2
3RV10 41
S3
3RV10 42
S3
Type of
protection/
Identification
Ex II (2) GD
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 5.
1)
Information for the implementation of current monitoring motor protection devices.
Definition of the locked-rotor time tE: if the rotor of an explosion-protected three-phase AC motor of protection type "Increased Safety" EEx e stalls (locks) at
operating temperature during runtime, the motor must be switched off, at the very latest, when either the rotor or the stator winding have reached their maximum temperature. The time that elapses until the rotor or stator winding has reached maximum temperature is called the locked-rotor time tE or tE time.
The demands made on overload protective devices with regard to tE time: for tripping devices and relays with inverse time-delay operation, tripping characteristics must be available at the operating site. The characteristics should show the release time for 3-pole loading, assuming a cold state and a room temperature
of 20 °C, depending on at least a 3 - 8-fold setting current. The protective devices must comply with the specified release times with a permissible deviation of
± 20 %. The tripping devices and relays for machines with cage rotors must be selected such that the release times for 3-pole loading do not exceed the lockedrotor time tE specified on the type plate.
For information on the tripping characteristics of our circuit-breakers and overload relays, visit our web site at:
www.siemens.com/lowvoltage/manuals
14
Low-voltage controls and distribution for potentially explosive areas
Protecting1) (continued)
SIRIUS 3RB2 and 3RU1 overload relays
SIRIUS overload relays, which are available as solid-state (3RB2) and thermal (3RU1) versions,
are designed for the inverse-time delayed protection from overload in the main circuit. This includes all electrical loads – as well as all other relevant switching and protection devices in the
respective load feeder.
The overload relays are certified according to ATEX and thus suitable for motors with "increased
safety" type of protection EEx e.
3RB20, 3RB21
3RU11
Type
Size
Certificate number
Certification
based on
Type of
protection/
Identification
for standard applications
3RB20, 3RB21
EN 60079-14,
IEC 60947-4-1,
IEC 61508
Ex II (2) GD
3RB22, 3RB29
S00
to
S12
PTB 06 ATEX 3001
for High-Feature applications
3RU11 1
S00
3RU11 2
S0
DMT 98 ATEX G 001,
IEC 60079-14,
DMT 98 ATEX G 001 N1 EN 60079-14
3RU11 3
S2
3RU11 4
S3
3RB solid-state overload relays
PTB 05 ATEX 3022
3RU1 thermal overload relays
for standard applications
Ex II (2) GD
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 5.
1)
Information for the implementation of current monitoring motor protection devices.
Definition of the locked-rotor time tE: if the rotor of an explosion-protected three-phase AC motor of protection type "Increased Safety" EEx e stalls (locks) at
operating temperature during runtime, the motor must be switched off, at the very latest, when either the rotor or the stator winding have reached their maximum temperature. The time that elapses until the rotor or stator winding has reached maximum temperature is called the locked-rotor time tE or tE time.
The demands made on overload protective devices with regard to tE time: for tripping devices and relays with inverse time-delay operation, tripping characteristics must be available at the operating site. The characteristics should show the release time for 3-pole loading, assuming a cold state and a room temperature
of 20 °C, depending on at least a 3 - 8-fold setting current. The protective devices must comply with the specified release times with a permissible deviation of
± 20 %. The tripping devices and relays for machines with cage rotors must be selected such that the release times for 3-pole loading do not exceed the lockedrotor time tE specified on the type plate.
For information on the tripping characteristics of our circuit-breakers and overload relays, visit our web site at:
www.siemens.com/lowvoltage/manuals
Low-voltage controls and distribution for potentially explosive areas
15
Product range of
Low-voltage controls and distribution
for potentially explosive areas
Starting
SIRIUS 3RW soft starters
Soft starters offer you a complete spectrum covering all standard and High-Feature
applications of motor starting. Thus the advantages of soft starting and smooth ramp-down
for simple and economical realization of optimal machine concepts are available today for the
most diverse applications.
Soft starters for standard
applications
Type
Size
Certificate number
Certification
based on
Type of
protection/
Identification
3RW40
S6,
S10/
S12
BVS 05 ATEX F 002
EN 60079-14,
IEC 60947-4-2,
IEC 61508
Ex II (2) GD
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 6.
16
Low-voltage controls and distribution for potentially explosive areas
Monitoring and control1)
SIMOCODE pro 3UF7 motor management system
The communication-capable, modularly designed SIMOCODE pro motor management system
(SIRIUS Motor management and Control Devices) quickly and reliably protects motors of types
of protection EEx e and EEx d in potentially explosive areas. SIMOCODE pro is certified according to the latest ATEX standards.
The use of SIMOCODE pro also means that no time is lost because of periodically necessary
function tests of feeders in the Ex area.
SIMOCODE pro
motor management and
control devices
Type
Size
Certificate number
3UF7
S00 to BVS 06 ATEX F 001
S12
Certification
based on
Type of protect./
Identification
EN 60079-14,
IEC 60947-4-1,
IEC 61508
Ex I (M2),
Ex II (2) GD
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 7.
SIRIUS 3RN1 thermistor motor protection relays for PTC sensors
3RN1 thermistor motor protection relays are advantageous wherever current-dependent protection by means of motor starter protectors or overload relays are not the ideal means of
monitoring. In certain situations an overheating can occur often due to external influences.
This overheating cannot be detected by the thermal image in the motor starter protector/overload relay. SIRIUS thermistor motor protection relays are certified for gases and dust according
to ATEX.
Type
Width Certificate number
Certification
based on
Type of protect./
Identification
EN 60079-14,
IEC 60947-8
Ex II (2) G
mm
Thermistor motor protection 3RN10
relays for PTC sensors
3RN10 11-.B,
(PTCs Type A)
3RN10 11-.G,
3RN10 12-.B,
3RN10 12-.G,
3RN10 13-…0
22.5;
45
PTB 01 ATEX 3218
Ex II (2) GD
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 7.
1)
Information for the implementation of current monitoring motor protection devices.
Definition of the locked-rotor time tE: if the rotor of an explosion-protected three-phase AC motor of protection type "Increased Safety" EEx e stalls (locks) at
operating temperature during runtime, the motor must be switched off, at the very latest, when either the rotor or the stator winding have reached their maximum temperature. The time that elapses until the rotor or stator winding has reached maximum temperature is called the locked-rotor time tE or tE time.
The demands made on overload protective devices with regard to tE time: for tripping devices and relays with inverse time-delay operation, tripping characteristics must be available at the operating site. The characteristics should show the release time for 3-pole loading, assuming a cold state and a room temperature
of 20 °C, depending on at least a 3 - 8-fold setting current. The protective devices must comply with the specified release times with a permissible deviation of
± 20 %. The tripping devices and relays for machines with cage rotors must be selected such that the release times for 3-pole loading do not exceed the lockedrotor time tE specified on the type plate.
For information on the tripping characteristics of our circuit-breakers and overload relays, visit our web site at:
www.siemens.com/lowvoltage/manuals
Low-voltage controls and distribution for potentially explosive areas
17
Product range of
Low-voltage controls and distribution
for potentially explosive areas
Detection
3SE2 position switches
Position switches are used wherever movable parts in plants and on machines have to be
positioned, controlled and monitored.
Whether for monitoring protection equipment with hinges or for monitoring laterally movable
protection equipment or for detecting dangerous movements of machine parts – our devices
can meet practically all industrial requirements.
Type
Width
Certificate
number
Certification
based on
Type of
protection/
Identification
mm
Position switches
3SE2 100-.....-0AE0 56
3SE2 120-.....-0AE0 40
ATEX 2603a EN 50281-1,
EN 50014
Ex II 3D
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 8.
18
Low-voltage controls and distribution for potentially explosive areas
Commanding and signaling
3SB3 commanding and signaling devices
Commanding and signaling devices make sure that the conditions of machines and plants (e.g.
sources of error or disturbances) are being signaled in time and reliably and that machines and
plants are being controlled and brought to a safe condition in case of an emergency.
Part of our extensive product range are actuators and switch blocks as well as lampholders with
LED which are called simple electrical apparatus in compliance with ATEX directive 94/9/EG
thus being suitable for application in intrinsic circuits.
Type
Version
Certificate
number
Certification
based on
Type of
protection
Actuator
3SB30 ..
3SB35 ..
Plastic or metal
actuator
Contact block
3SB34 ..
ATEX 2690b Simple electrical apparatus in
compliance
Spring-loaded
with EN 50020,
terminals or screw
IEC 60947-5-1
connection
Application only in
circuits of type of
protection i
(Intrinsic safety)
acc. to EN 50020
Spring-loaded
ATEX 2689b Simple electriterminals or screw
cal apparatus in
connection
compliance
with EN 50020,
Rated voltage
IEC 60947-5-1
24 V AC/DC,
BA 9s base
Application only in
circuits of type of
protection i
(Intrinsic safety)
acc. to EN 50020
Application up to a
voltage of 26,4 V
(LEDs)
Actuating elements
Components for actuating elements
Lampholder
3SB34 ..-1A
LED
3SB39 01-1.A
You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 9.
Visit us on the Internet:
www.siemens.com/lowvoltage/atex
Test certificates can be found under
www.siemens.com/automation/support
Low-voltage controls and distribution for potentially explosive areas
19
00_atex_U1_U4_200606_en.FH10 Tue Jul 11 13:27:40 2006
Seite 2
Further information
Literature
European Parliament and Council Directive 94/9/EC of 23 March
1994 on the forthcoming legislation for Member States on protective
devices and systems for use in potentially explosive atmospheres
Official Journal of the European Communities, No. L 100/1
DIN VDE 0170/0171 Part 1 ff.
Electrical apparatus for potentially explosive atmospheres
DIN VDE 0470 Part 1 (EN 60529)
IP degree of protection; protection of persons against access to
hazardous parts and of electrical equipment against ingress of
solid foreign objects and harmful quantities of water
DIN VDE 0165/02.91
Installation of electrical apparatus in potentially explosive areas
DIN EN 60079-14 VDE 0165 Part 1:2004-07
Electrical apparatus for potentially explosive gas atmospheres
Electrical installations in hazardous areas (other than mines)
VDE-Verlag GmbH, Berlin
NFPA 70 - 1996 National Electrical Code, Ausgabe 1996
National Fire Protection Association, Quincy, MA, USA
NFPA 70 - 1999 National Electrical Code, Ausgabe 1999
National Fire Protection Association, Quincy, MA, USA
1998 Canadian Electrical Code, 18. Ausgabe
Canadian Standards Association, Etobicoke, ON, Canada
1996 National Electrical Code Review and Application Guide
Killark Electric Manufacturing Company, St. Louis, MO, USA
1998 Canadian Electrical Code Review and Application Guide
Hubbell Canada Inc. - Killark, Pickering, ON, Canada
Publication
Explosionsschutz - Grundlagen
R. STAHL SCHALTGERÄTE GMBH,
Waldenburg
www.siemens.com/lowvoltage
Siemens AG
Automation and Drives
Low-Voltage Controls and Distribution
Postfach 48 48
90327 NÜRNBERG
GERMANY
w w w. si e m e n s .c o m/ a uto ma t i o n
The information provided in this brochure contains descriptions or
characteristics of performance which in case of actual use do not always
apply as described or which may change as a result of further development
of the products. An obligation to provide the respective characteristics shall
only exist if expressly agreed in the terms of contract. Availability and
technical specifications are subject to change without notice.
All product designations may be trademarks or product names of
Siemens AG or supplier companies whose use by third parties for their own
purposes could violate the rights of the owners.
Order No. E86060-T1811-A101-A1-7600
Token fee: 0,00 €
Subject to change without prior notice | Dispo 27602 | KB 0706 2. ROT 20 En / 603057 | Printed in Germany | © Siemens AG 2006
K. Nabert and G. Schön:
Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe
(Safety characteristics of flammable gases and vapors)
Deutscher Eichverlag, Braunschweig