Level and Pressure
Product Information
Process pressure transmitters
p
Contents
Contents
1 Product description ......................................................................................... 3
2 Function and application
2.1
2.2
2.3
Pressure measuring principles ........................................................................... 4
Principle of operation of the measuring cell ....................................................... 4
Features of the ceramic measuring cells ........................................................... 4
3 Types and versions
3.1
3.2
3.3
3.4
3.5
3.6
Instrument overview ............................................................................................. 6
Electronic versions ............................................................................................... 8
The differences at a glance ............................................................................... 10
Measuring ranges .............................................................................................. 11
Process fittings ................................................................................................... 14
Approvals and certificates ................................................................................ 15
4 Technical data
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
VEGABAR 14 ......................................................................................................
VEGABAR 15 ......................................................................................................
VEGABAR 40 ......................................................................................................
VEGABAR 41 ......................................................................................................
VEGABAR 44 ......................................................................................................
VEGADIS 10 .......................................................................................................
Ex technical data ................................................................................................
Dimensions ..........................................................................................................
16
18
20
22
24
26
27
28
5 Mounting
5.1
5.2
Mounting instructions ......................................................................................... 36
Mounting VEGADIS 10 ....................................................................................... 36
6 Electrical connection
6.1
6.2
6.3
6.4
6.5
Connection
Connection
Connection
Connection
Connection
instructions ......................................................................................
plans ................................................................................................
examples ........................................................................................
instructions for Ex-applications ....................................................
examples for Ex-applications .......................................................
37
38
39
39
40
7 Hot steam measurement with VEGABAR 40 ................................................. 41
8 Pressure transmitters with isolating diaphragms
8.1
8.2
8.3
8.4
8.5
8.6
General information on isolating diaphragms ..................................................
Applications ........................................................................................................
Function ...............................................................................................................
Selection criteria .................................................................................................
Error calculation ..................................................................................................
Application temperatures ..................................................................................
42
42
42
42
43
44
9 Accessories ................................................................................................... 46
2
Process pressure transmitters
Product description
1 Product description
These process pressure transmitters
represent an efficient, proven sensor
system for process pressure measurement. Ongoing development in
conjunction with the latest advances
in materials science guarantee quality and precision. Beside their
processing quality and high ageing
resistance, the pressure transmitters
are characterised by process fittings
exactly adapted to the measurement
conditions. One common feature of
the VEGA pressure transmitters is the
incorporation of the completely dry,
ceramic-capacitive CERTEC ® measuring cell with a diaphragm of high
purity sapphire ceramic®.
Maximum accuracy and excellent
long-term stability characterise these
pressure transmitters. In cooperation
with various industries, pressure
transmitters for sophisticated applications have been developed. Specially adapted materials and design
variants enable their use in corrosive
and abrasive products as well as in
processes with increased aseptic requirements (food processing or pharmaceutical industry).
The sensors are used in all industries:
- Chemicals
- Pharmaceutical/Cosmetics
- Petrochemicals
- Water/Waste water
- Foodstuffs
- Beverage industry
- Paper industry
- Shipbuilding
- Printing industry
- Mining
- Mechanical engineering
Process pressure transmitters
Several versions for the output of the
measuring signal are available:
- 4 … 20 mA
- HART®
- Profibus PA
Process pressure transmitters are
also available in different adjustment
and indication versions.
Certified instruments are available for
use in hazardous areas, in pressurized vessels, in hygienic products or
as part of an overfill protection system. They are certified acc. to:
- CENELEC EEx ia IIC
- PTB Ex-Zone 0 (Germany)
- EHEDG
- WHG
- 3A
- FDA
Instrument features
• Dry ceramic measuring cells.
• Ceramic measuring cell up to
150-fold overload resistant.
• Resistant against abrasive and
corrosive products.
• Continuous self-monitoring
right up to the diaphragm.
• Measuring ranges for absolute
and relative pressure.
• Digital output signal (Profibus
PA, HART® ) or 4 … 20 mA output signal.
• Accuracy optionally 0.1 %,
0.25 % or 0.5 %.
• Exact, digital processing of
measured data.
• Long-term stability better than
0.1 %/12 months.
• Temperature stability better
than 0.05 %/10 K.
• Turn down 1 : 30, Turn up
+95 %.
• Medium temperatures up to
400°C.
• Unpressurised adjustment (dry
adjustment).
• Pointer function for pressure
and temperature.
• Multisensor - two measured
values from one sensor:
Profibus PA instruments deliver
beside the pressure signal also
the measuring cell temperature
as additional information.
• Special aseptic applications for
the food processing and pharmaceutical industry (FDA, 3A,
EHEDG certified).
• Adjustment/indication also in
separate housing VEGADIS 10
possible.
3
Function and application
2 Function and application
2.1 Pressure measuring
principles
2.2 Principle of operation of
the measuring cell
There are basically three types of
pressure measurement:
- absolute pressure measurement
- relative pressure measurement
- differential pressure measurement.
Plate capacitor principle
Self test and self monitoring
The
ceramic
measuring
cell
CERTEC® is manufactured from the
newly developed sapphire ceramic®
material. A ceramic diaphragm is
bonded to the ceramic base element
with solder glass. The ceramic base
element and diaphragm are printed
inside with a gold layer and form the
plates of the capacitor.
To increase reliability, all pressure
transmitters monitor themselves continuously. The measured value, the
temperature and the operating voltage are checked.
The process pressure transmitters introduced in this product information
brochure are available as absolute or
relative pressure transmitters.
P=0
(Vacuum)
Pref.
P
Diaphragm
P1
Relative
P2
16 µm
P
Absolute
Gold electrodes
Solder
Pmess
glass
Difference
Principle of absolute, relative and differential
pressure measurement
Absolute pressure measurement
In absolute pressure measurement,
the absolute vacuum is the reference
pressure to which all measured values refer. In an unpressurised state,
these pressure transmitters indicate
the existing air pressure. This is why
they can be also used as barometers.
Relative pressure measurement
Pressure measurement according to
the relative pressure measuring principle is the most commonly used
measuring technique. The existing
ambient pressure (air pressure) is the
reference pressure. Relative pressure transmitters thus indicate zero
bar in an unpressurised state.
Differential pressure measurement
Basic
element
PAir
Cmeas
Cref
The process pressure transmitters
with ceramic CERTEC® measuring
cell also offer in addition the advantage of a continuous self monitoring
right up to the diaphragm: Meas. and
reference capacitance of the measuring cell are in a defined ratio over
the entire measuring range. Any deviation from this ratio is a reliable indicator of failure of the measuring cell.
If failures or malfunctions are detected during these routines, a fault
signal is triggered. The fault signal
can then be processed in the signal
conditioning instrument or in the connected signal processing (e.g. PLC
system).
Cut through a relative pressure ceramic measuring cell.
The "plate distance" between the ceramic base element and the diaphragm is 16 µm. The diaphragm
moves in a microscopically small distance over the measuring range and
causes capacitance changes by
means of the varying plate distance.
This capacitance change is detected
by an ASIC (Application Specific Integrated Circuit) and converted into a
pressure-proportional signal by the
integrated oscillator with microcontroller. The exact, digital processing
of measured data with maximum
resolution ensures outstanding accuracy.
Differential pressure transmitters detect the difference between two pressures. The two pressures to be detected are transferred to one sensor
element through two separate process fittings.
4
Process pressure transmitters
Function and application
2.3 Features of the ceramic
measuring cells
The sapphire ceramic ® developed by
VEGA consists of a special finegrained aluminium oxide with an average grain size of only 2.5 µm, in
contrast to other ceramics that have a
grain size of more than 30 µm. With a
previously unreached purity of
99.9 %, the CERTEC ® sapphire ceramic® exhibits undreamt-of mechanical and chemical properties:
- completely hysteresis-free
- ideal elastic properties
- extremely overload resistant
- maximum corrosion and acid resistance
- resistant to very abrasive products
- maximum hardness
- absolutely ageing-resistant
Chemically resistant
In field tests and test series using
10 % caustic soda solution, hydrochloric acid, sulphuric acid, phosphoric acid and nitric acid for artificial
ageing, sapphire ceramic® has
proven to be a highly corrosion resistant material.
Abrasion resistant
Abrasion is basically a machining
process in which very small hard particles remove microscopically small
chips. Ceramic is resistant to this
abrasion process.
Ten times harder than stainless steel,
the sapphire ceramic® diaphragm effectively prevents wear, abrasion or
damage of the diaphragm by microscopic chipping. Whether caused by
paper pulp carrying metal particles,
which can act like grinding paste, or
by nut chocolate which, due to nut
fragments, can be extremely erosive,
the hard ceramic material can withstand any form of diaphragm abrasion.
Absolutely flush
The seal concept unique in comparison to other sensors, enables perfect
flushness, a critical factor in many
applications.
In the food processing and pharmaceutical industry, flushness is the key
to solving the well-known problems
regarding the instrumentation of a
plant. Beside the expected high durability, accuracy, long-term stability,
ruggedness and user-friendly setup,
a sensor must also meet utmost hygienic and aseptic requirements. GMP,
GHP, FDA, sterilisation, EHEDG and
3A are the requirements measurement technology always has to meet
in the food processing and pharmaceutical industry. The sensor must be
reliably cleaned or sterilised with CIP
(Cleaning in place) and SIP (Sterilisation in place). Perfect flushness is the
solution.
metallic process
fitting
Form seal
Overload resistant
The CERTEC® sapphire ceramic®
measuring cell exhibits overload resistance up to 150 fold. A flowing liquid suddenly blocked by a valve closing in 20 ms, produces local shock
waves with 20 to 40 times the nominal
pressure. For a few milliseconds, the
pressure rises to levels that can destroy sensors with a lower overload
resistance.
Features of the CERTEC® measuring cell
• Dry, ceramic-capacitive sensor element of sapphire ceramic® (99.9 %
Al2O3).
• Versions for relative and absolute
pressure (measuring ranges from
-1 bar … 0.1 bar … 60 bar).
• Up to 150 fold overload resistance
(also dynamic!).
• Excellent long-term stability and
reproducibility.
• Excellent abrasion and corrosion
resistance.
• Minimal internal air volume.
• Absolutely flush mounting possible.
• FDA tested.
• Integrated continuous self-monitoring.
• Integrated temperature sensor.
Ceramic
Absolutely flush ceramic pressure transmitters
with patented seal concept
Dirt and impurities mainly stick in
pores,
gaps,
shoulders
and
scratches. Such are avoided by the
flushness and surface quality.
Process pressure transmitters
5
Types and versions
3 Types and versions
3.1 Instrument overview
VEGABAR 14
VEGABAR 15
VEGADIS 10
Process pressure transmitters
with CERTEC ®
Process pressure transmitters
with piezoresistive sensor element
External indicating instrument
- dry, ceramic-capacitive sensor element
- up to 150-fold overload resistance
- two-wire system 4 … 20 mA
- supply voltage 12 … 30 V
- zero point shift ± 5 % without current limitation (with IP 65)
- housing with connecting plug acc.
to DIN 43 650 in protection IP 65
- housing with direct cable outlet in
protection IP 67
- accuracy class 0.5
- two-wire system 4 … 20 mA
- supply voltage 10 … 30 V
- housing with connection plug acc.
to DIN 43 650 in protection IP 65
- process fitting G 1 / 2 A acc. to
DIN 16 288 of 1.4404
- accuracy class 0.3
- external housing for surface mounting with adjustment/display for
VEGABAR 40 … 44 process pressure transmitters
- LC display for digital and quasianalogue display of measured values
- display range -9999 … 9999, with
individually adjustable decimal
point
- protection IP 66/IP 67
Applications:
Pressure measurement of gases, vapours and liquids in all areas of process control technology.
With flush diaphragm for dense liquids, non-uniform and crystallising
products.
6
Applications:
Pressure measurement of gases, vapours and liquids in all areas of process control technology.
Process pressure transmitters
Types and versions
VEGABAR 40
VEGABAR 41
VEGABAR 44
Process pressure transmitters
with internal CERTEC®
Process pressure transmitters
with isolating diaphragm
Process pressure transmitters
with flush CERTEC®
- dry, ceramic-capacitive sensor element
- up to 150-fold overload resistance
- repair and service-friendly through
interchangeable process fittings
with measuring cell and interchangeable electronics requiring
no fresh adjustment
- microcomputer controlled electronics with Profibus-PA interface or twowire system 4 … 20 mA, HART® ,
VVO
- optional: continuous self-monitoring of electronics and measuring
cell
- housing of powder-coated aluminium or durable, shock-resistant
plastic in protection IP 65
- adjustment/indication also in separate housing VEGADIS 10 possible
- TÜV tested acc. to regulations for
pressurized vessels
Applications:
Pressure measurement of gases, vapours, liquids and dusts in all areas of
process technology.
Process pressure transmitters
- interchangeable electronics requiring no fresh adjustment
- microcomputer controlled electronics with Profibus-PA interface or twowire system 4 … 20 mA, HART® , VVO
- housing of powder-coated aluminium or durable, shock-resistant
plastic in protection IP 65
- adjustment/indication also in separate housing VEGADIS 10 possible
Applications:
Pressure detection in very corrosive
products at high process temperatures.
- dry, ceramic-capacitive sensor element
- up to 150-fold overload resistance
- interchangeable electronics requiring no fresh adjustment
- microcomputer controlled electronics with Profibus-PA interface or twowire system 4 … 20 mA, HART® ,
VVO
- optional: continuous self-monitoring of electronics and measuring
cell
- housing of powder-coated aluminium or durable, shock-resistant
plastic in protection IP 65
- adjustment/indication also in separate housing VEGADIS 10 possible
Applications:
Pressure detection of abrasive, high
viscosity products such as in the paper, chemical, food processing, pharmaceutical and water/waste water industries.
7
Types and versions
3.2 Electronics versions
Connection technologies
Adjustment versions
There are basically three different
connection technologies for VEGA
process pressure transmitters.
The VEGA process pressure transmitters can be adjusted (configuration
and parameter adjustment) in different ways depending on the instrument version.
4 … 20 mA
Dependent on the pressure, the process pressure transmitter consumes a
current between 4 mA and 20 mA.
This current is a measure on the pressure or the level (e.g. 4 mA correspond to 0 bar, 20 mA correspond to
10 bar).
VEGADIS 10, like VEGABAR, can be
either equipped with the module for
"adjustment of the basic functions" or
the module for the "menu-driven adjustment with additional functions".
VEGADIS 10 is also available without
adjustment module, equipped only
with an indicating module.
Adjustment of the basic functions
Adjustment of HART ® instruments
with VEGA Visual Operating (VVO)
OPERATE
ti
ZERO
HART®
Pressure transmitters with HART®
technology also consume a supply
current between 4 mA and 20 mA,
which corresponds to the acting pressure. In addition a digital signal containing information from the pressure
transmitter, e.g. on the acting pressure, is superimposed on the current.
At the same time, these signals are
also used to transmit commands, e.g.
for adjustment.
The operating mode "Multidrop" is
also possible. Several instruments
are connected in parallel to one twowire cable (max. 15). Each instrument
must have an address for identification. The current consumption of
each instrument is 4 mA.
Profibus PA
Profibus PA is an open field bus especially for process technology. With
this it is possible to connect several
sensors, also in Ex area, to one bus
cable. The connection is carried out
in two-wire technology, but with special cable types.
A diskette with the sensor master file,
to enable connection to the Profibus
system, comes with the pressure
transmitter. This file contains information required for programming, e.g. of
a PLC. These files are also available
on the VEGA homepage as download
files (www.vega.com).
8
SPAN
With this adjustment module you can
adjust the pressure transmitter and
adjust an integration time.
Menu-driven adjustment with additional functions
OK
With this adjustment module you can
reach all functions of the pressure
transmitter (adjustment, integration
time adjustment, modification of the
menu language, simulation etc.). In
addition, an LCD matrix displays the
measured values and the adjustment
steps.
VEGACONNECT
The software VVO enables all adjustments, such as configuration and parameter adjustment, and also displays of course the measured values.
Working with VVO is very easy, the
creation of measurement loops and
other adjustment steps can be easily
learned.
A VEGACONNECT interface converter must be interposed to connect
the PC with the software VVO to the
sensor line.
R = 100 Ω
to the
sensor
{
+
–
VEGACONNECT
Adjustment with VEGADIS 10
VEGADIS 10 is an adjustment and indicating instrument which can be
mounted up to 25 m away from
VEGABAR. The instrument connection consists of a four-wire standard
cable.
Process pressure transmitters
Types and versions
Adjustment with HART ® handheld
Here also, all functions of the pressure transmitter can be adjusted. The
measured values and other information of the pressure transmitter are
displayed on the HART ® display.
Adjustment of Profibus PA
instruments with VEGA Visual
Operating (VVO)
To operate the sensors with the adjustment software VVO, a Profibus DP
interface card (from Softing) is required in the PC. This card must be
used to enable the connection between computer and Profibus DP cable (a connection directly on the sensor or on the Profibus PA cable is not
possible). The computer with VVO has
therefore the status "Master of class
2".
Segment
coupler
Indication module
Tendency
indicaBar
tion
graph
Digital
value
VEGABAR 40 … 44 as well as the
VEGADIS 10 can be equipped with
the indication module.
- 4 digits and decimal point
- tendency indication
- quasi-analogue indication (bar
graph)
DP cable
Profibus PA
cable
VVO
When using the adjustment module
"Adjustment of the basic functions"
the measured value will only be indicated in bar.
+
250 Ω
–
Ri < 250 Ω
Profibus DP interface card
(Messrs. Softing)
Field distributor
Sensor
Process pressure transmitters
Sensor
Sensor
When using the adjustment module
"Menu-driven adjustment with additional functions" the measured value
can be scaled individually.
Sensor
9
Types and versions
3.3 The differences at a glance
The table clearly shows the main criteria and the differences between the process pressure transmitters.
VEGABAR
40
41
44
•
•
•
•
•
•
Adjustment options
- basic function module
- menu-guided adjustment
- VEGA Visual Operating
- HART ® handheld
- adjustment with VEGADIS 10
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Indication
- internal indication
- indication with VEGADIS 10
•
•
•
•
•
•
Plastic housing
•
•
•
•
•
•
Version in EExd
•
•
•
Tested acc. to DruckbehV
•
•
•
•
•
Electrical interface
- 4 … 20 mA
- 4 … 20 mA and HART ®
- Profibus PA
Metal housing
14
15
•
•
•
Flush process fittings
•
•
Process fittings of PVDF
•
High process temperature/
Special materials
•
Gauge pressure range in bar
- smallest measuring range
- largest measuring range
0…0.1
0…60
0…1
0…600
0…0.1
-1…60
0…0.4
-1…60
0…0.1
-1…60
Absolute pressure range in bar
- smallest measuring range
- largest measuring range
0…1
0…60
––
––
0…1
0…60
0…1
0…60
0…1
0…60
0.5
0.3
0.1
0.25
0.1
0.25
0.1
0.25
•
•
Accuracy class
Interchangeable process fitting
•
Interchangeable electronics
(without new adjustment)
•
10
Process pressure transmitters
Types and versions
3.4 Measuring ranges
VEGABAR 14
Nominal measuring range
Gauge pressure ranges
0…0.1 bar / 0…10 kPa
0…0.25 bar / 0…25 kPa
0…0.4 bar / 0…40 kPa
0…0.6 bar / 0…60 kPa
0 ... 1.0 bar/ 0 ... 100 kPa
0…1.6 bar / 0…160 kPa
0…2.5 bar / 0…250 kPa
0…4.0 bar / 0…400 kPa
0…6.0 bar / 0…600 kPa
0…10.0 bar / 0…1 000 kPa
0…16.0 bar / 0…1 600 kPa
0…25.0 bar / 0…2 500 kPa
0…40.0 bar / 0…4 000 kPa
0…60.0 bar / 0…6 000 kPa
-0.1…+0.1 bar / -10…+10 kPa
-0.2…+0.2 bar / -20…+20 kPa
-0.5…+0.5 bar / -50…+50 kPa
-1.0…+0.6 bar / -100…+60 kPa
-1.0…+1.0 bar / -100…+100 kPa
-1.0…+1.5 bar / -100 …+150 kPa
-1.0…+3.0 bar / -100…+300 kPa
-1.0…+5.0 bar / -100…+500 kPa
-1.0…+9.0 bar / -100…+900 kPa
-1.0…+15.0 bar / -100…+1 500 kPa
Absolute pressure ranges
0…1.0 bar / 0…100 kPa
0…1.6 bar / 0…160 kPa
0…2.5 bar / 0…250 kPa
0…4.0 bar / 0…400 kPa
0…6.0 bar / 0…600 kPa
0…10.0 bar / 0…1 000 kPa
0…16.0 bar / 0…1 600 kPa
0…25.0 bar / 0…2 500 kPa
0…40.0 bar / 0…4 000 kPa
0…60.0 bar / 0…6 000 kPa
Gauge pr. resistance
Low pr. resistance
15 bar / 1 500 kPa
30 bar / 3 000 kPa
30 bar / 3 000 kPa
35 bar / 3 500 kPa
35 bar / 3 500 kPa
50 bar / 5 000 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
20 bar / 2 000 kPa
30 bar / 3 000 kPa
35 bar / 3 500 kPa
50 bar / 5 000 kPa
50 bar / 5 000 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
-0.2 bar
-0.8 bar
-0.8 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-0.4 bar
-0.8 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
35 bar / 3 500 kPa
50 bar / 5 000 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
VEGABAR 15
Nominal measuring range
Gauge pressure ranges
0 ... 1.0 bar/ 0 ... 100 kPa
0…1.6 bar / 0…160 kPa
0…2.5 bar / 0…250 kPa
0…4.0 bar / 0…400 kPa
0…6.0 bar / 0…600 kPa
0…10.0 bar / 0…1 000 kPa
0…16.0 bar / 0…1 600 kPa
0…25.0 bar / 0…2 500 kPa
0…40.0 bar / 0…4 000 kPa
0…60.0 bar / 0…6 000 kPa
0…100 bar / 0…10 000 kPa
0…160 bar / 0…16 000 kPa
0…250 bar / 0…25 000 kPa
0…400 bar / 0…40 000 kPa
0…600 bar / 0…60 000 kPa
Process pressure transmitters
/ -20 kPa
/ -80 kPa
/ -80 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -40 kPa
/ -80 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
Max. test pressure
2 bar / 200 kPa
8 bar / 800 kPa
8 bar / 800 kPa
8 bar / 800 kPa
20 bar / 2 000 kPa
20 bar / 2 000 kPa
50 bar / 5 000 kPa
50 bar / 5 000 kPa
80 bar / 8 000 kPa
200 bar / 20 000 kPa
200 bar / 20 000 kPa
320 bar / 32 000 kPa
600 bar / 60 000 kPa
600 bar / 60 000 kPa
900 bar / 90 000 kPa
Internal
diaphragm
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Flush
diaphragm
•
•
•
•
•
•
•
11
Types and versions
VEGABAR 40 and 44
12
Nominal measuring range
Gauge pressure
0…0.1 bar / 0…10 kPa
0…0.2 bar / 0…20 kPa
0…0.4 bar / 0…40 kPa
0…1.0 bar / 0…100 kPa
0…2.5 bar / 0…250 kPa
0…5.0 bar / 0…500 kPa
0…10.0 bar / 0…1 000 kPa
0…20.0 bar / 0…2 000 kPa
0…40.0 bar / 0…4 000 kPa
0…60.0 bar / 0…6 000 kPa
-0.05…+0.05 bar / -5…+5 kPa
-0.1…+0.1 bar / -10…+10 kPa
-0.2…+0.2 bar / -20…+20 kPa
-0.5…+0.5 bar / -50…+50 kPa
-1.0…0.0 bar / -100…0 kPa
-1.0…+1.5 bar / -100…+150 kPa
-1.0…+4.0 bar / -100…+400 kPa
-1.0…+10.0 bar / -100…+1 000 kPa
-1.0…+20.0 bar / -100…+2 000 kPa
-1.0 …+40.0 bar / -100…+4 000 kPa
-1.0…+60.0 bar / -100…+6 000 kPa
Absolute pressure
0…1.0 bar / 0…100 kPa
0…2.5 bar / 0…250 kPa
0…5.0 bar / 0 …500 kPa
0…10.0 bar / 0…1 000 kPa
0…20.0 bar / 0…2 000 kPa
0…40.0 bar / 0…4 000 kPa
0…60.0 bar / 0…6 000 kPa
Gauge pr. resistance
Low pr. resistance
15 bar / 1 500 kPa
20 bar / 2 000 kPa
30 bar / 3 000 kPa
35 bar / 3 500 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
15 bar / 1 500 kPa
20 bar / 2 000 kPa
30 bar / 3 000 kPa
35 bar / 3 500 kPa
35 bar / 3 500 kPa
50 bar /5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
-0.2 bar
-0.4 bar
-0.8 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-0.2 bar
-0.4 bar
-0.8 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
/ -20 kPa
/ -40 kPa
/ -80 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -20 kPa
/ -40 kPa
/ -80 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
35 bar / 3 500 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
Process pressure transmitters
Types and versions
VEGABAR 41
Process pressure transmitters
Nominal pressure range
Gauge pressure
0…0.4 bar / 0…40 kPa
0…1.0 bar / 0…100 kPa
0…2.5 bar / 0…250 kPa
0…5.0 bar / 0…500 kPa
0…10.0 bar / 0…1 000 kPa
0…20.0 bar / 0…2 000 kPa
0…40.0 bar / 0…4 000 kPa
0…60.0 bar / 0…6 000 kPa
-0.05…+0.05 bar / -5…+5 kPa
-0.1…+0.1 bar / -10…+10 kPa
-0.2…+0.2 bar / -20…+20 kPa
-0.5…+0.5 bar / -50…+50 kPa
-1.0…0.0 bar / -100…0 kPa
-1.0…+1.5 bar / -100…+150 kPa
-1.0…+4.0 bar / -100…+400 kPa
-1.0…+10.0 bar / -100…+1 000 kPa
-1.0…+20.0 bar / -100…+2 000 kPa
-1.0 …+40.0 bar / -100…+4 000 kPa
-1.0…+60.0 bar / -100…+6 000 kPa
Absolute pressure
0…1.0 bar / 0…100 kPa
0…2.5 bar / 0…250 kPa
0…5.0 bar / 0 …500 kPa
0…10.0 bar / 0…1 000 kPa
0…20.0 bar / 0…2 000 kPa
0…40.0 bar / 0…4 000 kPa
0…60.0 bar / 0…6 000 kPa
Gauge pr. resistance
Low pr. resistance
30 bar / 3 000 kPa
35 bar / 3 500 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
15 bar / 1 500 kPa
20 bar / 2 000 kPa
30 bar / 3 000 kPa
35 bar / 3 500 kPa
35 bar / 3 500 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
-0.8 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-0.2 bar
-0.4 bar
-0.8 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
-1.0 bar
/ -80 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -20 kPa
/ -40 kPa
/ -80 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
/ -100 kPa
35 bar / 3 500 kPa
50 bar / 5 000 kPa
65 bar / 6 500 kPa
90 bar / 9 000 kPa
130 bar / 13 000 kPa
200 bar / 20 000 kPa
300 bar / 30 000 kPa
13
Types and versions
3.5 Process fittings
VEGABAR 14
GP
GR
GN
GA
GB
G1/2A, manometer connection DIN 16 288, PN 60, 1.4571
G1/2A, inner G1/4, PN 60, 1.4571
G1/2A, inner hole 11.4 mm, PN 60, 1.4571
1
/ 2" NPT, inner 1/4" NPT, PN 60, 1.4571
1
/ 2" NPT, inner hole 11.4 mm, PN 60, 1.4571
M20 x 1.5, manometer connection DIN 16 288, PN 60, 1.4571
VEGABAR 15
G 1/2 A acc. to DIN 16 288, 1.4401/1.4301
G 1/2 A acc. to DIN 228/1, 1.4401/1.4301; flush
VEGABAR 40
GM
GV
GP
GR
GI
GN
GA
GB
G 1/2 A, manometer connection DIN 16 288 PN 60, brass 2.0401
G 1/2 A, manometer connection DIN 16 288 PN 160, 1.4571
G 1/2 A, inner G 1/4 PN 160,1.4571
G 1/2 A, inner hole 11.4 mm PN 160, 1.4571
G 1/2 A, volume-reduced connection DIN 16 288, 1.4571
1
/ 2" NPT, inner 1/4" NPT PN 160, 1.4571
1
/ 2" NPT, inner hole 11.4 mm PN 160, 1.4571
M20 x 1.5, manometer connection DIN 16 288 PN 160,1.4571
VEGABAR 41
FA
Flange DN 25 PN 40, DIN 2501, seal surface DIN 2526, Form D, 1.4571
FB
Flange DN 40 PN 40, DIN 2501, seal surface DIN 2526, Form D, 1.4571
FC
Flange DN 50 PN 40, DIN 2501, seal surface DIN 2526, Form D, 1.4571
FE
Flange DN 50 PN 40 with extension 100 mm, 1.4571
FG
Flange DN 50 PN 40 with extension 200 mm, 1.4571
FH
Flange DN 80 PN 40, DIN 2501, seal surface DIN 2526, Form D, 1.4571
FK
Flange DN 80 PN 40 with extension 100 mm, 1.4571
FN
Flange 1" 300 lbs acc. to ANSI B 16.5, seal surface RF, 1.4571
FO
Flange 2" 600 lbs acc. to ANSI B 16.5, seal surface RF, 1.4571
RC
Tube isolating diaphragm for mounting between flanges DN 50, 1.4571
Process fittings for food processing/pharmaceutical industry (3A certification)
RF
Tube isolating diaphragm hygienic fitting DIN 11 851 DN 50, 1.4435
RH
Tube isolating diaphragm with TRI-Clamp 2", 1.4435
LA
Hygienic connection with compression nut F40 PN 40, 1.4435
LB
Hygienic connection with tension flange DN 32 PN 25, 1.4435
CA
TRI-Clamp 2", PN 10, 1.4435
VEGABAR 44
GG
Thread G 11/2 A PN 60, 1.4571
GN
Thread 11/2" NPT PN 60, 1.4571
Process fittings for the paper industry
BA
M44 x 1.25 with pressure screw Alu 3.1645 PN 25, 1.4571
BB
M44 x 1.25 with pressure screw 1.4571 PN 60, 1.4571
Process fittings for the chemical and pharmaceutical industry
GW
Thread G 11/2 A PN 10, PVDF
FW
Flange DN 50 PN 10, PVDF
Process fittings for food processing/pharmaceutical industry (3A certification)
RA
Bolting DN 40 PN 40 DIN 11 851, 1.4571
RB
Bolting DN 50 PN 25 DIN 11 851, 1.4571
LA
Hygienic connection with compression nut F40 PN 40, 1.4571
LB
Hygienic connection with tension flange DN 32 PN 25, 1.4571
PA
APV connection flange PN 6, 1.4571
TA
Tuchenhagen Varivent DN50/40 PN 25, 1.4571
AA
DRD, PN 40, 1.4571
CA
TRI-Clamp 2", PN 10, 1.4571
Further process fittings available on request.
14
Process pressure transmitters
Types and versions
3.6 Approvals and certificates
VEGABAR 40 … 44 process pressure transmitters with different approvals are available for use in Ex areas.
VEGABAR 40 VEGABAR 41 VEGABAR 44 VEGADIS 10
Ex Zone 2
•
StEx Zone 10
•
Ship approval
1)
•
•
•
•
•
•
CENELEC EEx ia IIC
•
•
•
ATEX II 1G EEx ia IIC
•
•
•
•
•
•
ATEX II 2G EEx d ia IIC
1)
1)
•
not with Profibus PA version
If for certain applications the use of approved instruments is required, the respective official documents (test reports, test
certificates and conformity certificates) must be noted. They are supplied with the respective instrument.
CE conformity
VEGABAR process pressure transmitters meet the requirements of EMC (89/336/EWG) and NSR (73/23/EWG). Conformity
has been judged acc. to the following standards:
EMC
Emission
EN 50 081 - 1: 1992
Susceptibility
EN 50 082 - 2: 1995
NSR
EN 61 010 - 1: 1993
NAMUR regulations
VEGABAR 14 … 44 process pressure transmitters (4 … 20 mA and HART ® version) meet the NAMUR regulations NE 21 and
NE 43.
VEGABAR 40 … 44 process pressure transmitters (Profibus PA version) meet the NAMUR regulations NE 21, May 1993.
Process pressure transmitters
15
Technical data
4 Technical data
4.1 VEGABAR 14
Mechanical data
Materials, wetted parts
Process fitting
Diaphragm
Seal measuring cell
stainless steel 1.4571
sapphire ceramic® (99.9 % Oxydeceramic)
Viton
Materials, non-wetted parts
Housing
Plug/Cable outlet
brass nickel-plated
PA
Weight
VEGABAR 14
approx. 450 g
Adjustment elements (only with plug version)
Trim potentiometer for zero point adjustment
Adjustment ranges (only with plug version)
Zero point adjustment
±5%
Electrical data
Supply and signal circuit
12 … 30 V DC
USS ≤ 1 V
3 … 23 mA
approx. 23 mA
1 ms (0 % – 63 %)
2-wire
depending on the supply voltage
(see load diagram)
Load RLtotal in Ohm
Supply voltage
Permissible residual ripple
Output signal
Current limitation
Rise time
Connection cable
Max. permissible load
675
600
300
12
18
24
30
Supply voltage UH in Volt
Connection
Plug
- cable entry
- screw terminals
Direct cable outlet
Pg 9 (for cable ø 4.5 … 7 mm)
for wire cross section up to 2.5 mm2
Protective measures
Protection 1)
- with plug connection DIN 43 560 A
- with direct cable outlet
Protection class
Overvoltage category
1)
16
IP 65
IP 67
III
III
To maintain the housing protection, a seal
suitable for the cable should be used in the
cable entry. If the seal used does not fit the
cable, it should be exchanged for a suitable
one.
Process pressure transmitters
Technical data
Accuracy (similar to DIN 16 086, DIN V 19 259 - 1 and IEC 770)
Deviation
Reference conditions (acc. to IEC 770)
- temperature
- rel. humidity
- air pressure
Determination of characteristics
Characteristics
Deviation of characteristics 1)
Hysteresis 1)
Repeatability 1)
15°C … 35°C
45 % … 75 %
860 mbar … 1060 mbar/86 kPa … 106 kPa
limit point adjustment acc. to DIN 16 086
linear
< 0.5 %
< 0.02 %
< 0.02 %
Influence of the ambient temperature
Average temperature coefficient
of the zero signal 1) 2)
< 0.15 %/10 K
Long-term stability
Long-term drift of the zero signal 1) 2)
< 0.15 % per year
Other actuating variables
Vibration resistance
mechanical vibrations with 4 g and
5 … 100 Hz
Ambient conditions
Ambient temperature
- protection IP 65
- protection IP 67
Medium temperature
Storage and transport temperature
1)
2)
-25°C … +85°C
-25°C … +60°C
-20°C … +100°C
-40°C … +100°C
Relating to the nominal measuring range.
Acc. to IEC 770, point 6.1.2 relating to the
nominal measuring range.
Process pressure transmitters
17
Technical data
4.2 VEGABAR 15
Mechanical data
Materials, wetted parts
Process fitting
Diaphragm
- internal sensor element
- flush version
stainless steel 1.4404
stainless steel 1.4404
stainless steel 1.4401
Materials, non-wetted parts
Housing
- internal sensor element
- flush version
Plug
stainless steel 1.4404
stainless steel 1.4301
PA
Weight
VEGABAR 15
approx. 300 g
Electrical data
Supply and signal circuit
Supply voltage
Permissible residual ripple
Output signal
Current limitation
Rise time
Connection cable
Max. permissible load
10 … 30 V DC
USS ≤ 1 V
3.5 … 23 mA
approx. 28 mA
< 4 ms (0 % – 63 %)
2-wire
depending on the supply voltage
(see load diagram)
Load RLtotal in Ohm
1000
500
0
10
15
20
25
30
Supply voltage U H in Volt
Connection
Cable entry
Pg 9 (DIN 43 650)
Protective measures
Protection 1)
Protection class
Overvoltage category
1)
18
IP 65
III
III
To maintain the housing protection, a seal
suitable for the cable should be used in the
cable entry. If the seal used does not fit the
cable, it should be exchanged for a suitable
one.
Process pressure transmitters
Technical data
Accuracy (similar to DIN 16 086, DIN V 19 259 - 1 and IEC 770)
Deviation
Reference conditions (acc. to IEC 770)
- temperature
- rel. humidity
- air pressure
Determination of characteristics
Characteristics
Deviation in characteristics 1)
- internal sensor element
- flush version
Hysteresis 1)
Repeatability 1)
15°C … 35°C
45 % … 75 %
860 mbar … 1060 mbar/86 kPa … 106 kPa
limit point adjustment acc. to DIN 16 086
linear
<
<
<
<
0.3
0.2
0.1
0.1
%
%
%
%
Influence of the ambient temperature
Average temperature coefficient
of the zero signal 1) 2)
< 0.20 %/10 K
Long-term stability
Long-term drift of the zero signal 1) 2)
< 0.25 % per year
Other actuating variables
Vibration resistance
mechanical vibrations with 4 g and
5 … 100 Hz
Ambient conditions
Ambient temperature
Medium temperature
Storage and transport temperature
1)
2)
-40°C … +85°C
-40°C … +100°C
-50°C … +85°C
Relating to the nominal measuring range.
Acc. to IEC 770, point 6.1.2 relating to the
nominal measuring range.
Process pressure transmitters
19
Technical data
4.3 VEGABAR 40
Mechanical data
Materials, wetted parts
Process fitting
Diaphragm
Seal measuring cell
brass 2.041, stainless steel 1.4571
sapphire ceramic® (99.9 % Oxydeceramic)
Viton, EPDM, Hifluor, Kalrez
Materials, non-wetted parts
Housing
- optional
Ground terminals
Window of the indicating module
high resistance plastic PBT (Polyester)
Alu die-casting, powder-coated
stainless steel 1.4305
Lexan
Weight
VEGABAR
approx. 0.8 kg
Adjustment and indicating elements
Menu-driven adjustment with additional function
- adjustment elements
4 keys
- indicating elements
DOT matrix display, 3 lines with 7 figures each
Version with adjustment module
- adjustment element
8-pole mini coding switch for adjustment of the
bus address
Indicating module
LC display with
- bar graph (20 segments)
- digital value (4-digits)
- tendency indicators for rising or falling values
Electrical data
Adjustment ranges
Zero
Span
adjustable from -20 … +95 % of nominal range
adjustable from 3.3 … 120 % of nominal range
Supply and signal circuit with 4 … 20 mA and HART® version
12 … 36 V DC
18 … 36 V DC
USS ≤ 1 V
USS ≤ 10 mV (only with HART® version)
3.8 … 20.5 mA
6 µA
approx. 22 mA
22 mA (3.6 mA)
0 … 10 s adjustable
85 ms (ti = 0 sec; 0 – 63 %)
2-wire
depending on the supply voltage
(see load diagram)
Load RLtotal in Ohm
Supply voltage
Exd version (pressure-tight encapsulation)
Permissible residual ripple
- at 500 Hz … 10 kHz
Output signal
- range
- resolution
Current limitation
Fault signal
Integration time
Rise time
Connection cable
Max. permissible load
1000
750
500
250
0
12
18
24
30
36
Voltage of the external
energy U H in Volt
Supply and signal circuit with Profibus PA version
Supply voltage
Current consumption
Integration time
Rise time
20
9 … 32 V DC
(provided by the segment coupler)
10 mA ± 1 mA
0 … 50 s
85 ms (ti = 0 sec; 0 – 63 %)
Process pressure transmitters
Technical data
Indication and adjustment circuit
For connection to
Data transmission
Connection cable
Max. cable length
VEGADIS 10 and/or indicating module
digital
4-wire (standard cable)
25 m
Connection
Cable entry
Screw terminals
Recommended bus cable types
M20 x 1.5 (for cable ø 5 … 9 mm)
for wire cross section up to 2.5 mm2
- SINEC 6XV 830-5AH10 (Siemens AG)
- SINEC L2 6XV1 830-35H10 (Siemens AG)
- 3079 A (Belden)
Protective measures
Protection 1)
Protection class
Overvoltage category
IP 65
III
III
Accuracy (similar to DIN 16 086, DIN V 19 259 - 1 and IEC 770)
Deviation
Reference conditions (acc. to IEC 770)
- temperature
- rel. humidity
- air pressure
Determination of characteristics
Characteristics
Deviation in characteristics 2)
- Turn Down 1 : 1
- Turn Down up to 1 : 5
- Turn Down up to 1 : 10
Hysteresis 2)
Repeatability 2)
15°C … 35°C
45 % … 75 %
860 mbar … 1060 mbar/86 kPa … 106 kPa
limit point adjustment acc. to DIN 16 086
linear
< 0.25 % with accuracy class 0.25
< 0.1 % with accuracy class 0.1
typ. < 0.3 % with accuracy class 0.25
typ. < 0.1 % with accuracy class 0.1
typ. < 0.4 % with accuracy class 0.25
typ. < 0.2 % with accuracy class 0.1
< 0.02 %
< 0.02 %
Influence of the ambient temperature
Average temperature coefficient of the zero signal 2) 3)
- Turn Down 1 : 1
< 0.15 %/10 K with accuracy class 0.25
< 0.05 %/10 K with accuracy class 0.1
- Turn Down up to 1 : 5
typ. < 0.225 %/10 K with accuracy class 0.25
typ. < 0.075 %/10 K with accuracy class 0.1
- Turn Down up to 1 : 10
typ. < 0.3 %/10 K with accuracy class 0.25
typ. < 0.1 %/10 K with accuracy class 0.1
Long-term stability
Long-term drift of the zero signal 2) 4)
< 0.1 % 2 years each
Other actuating variables
Calibration position
Influence of the calibration position
Vibration resistance
upright, diaphragm points downwards
< 0.2 mbar/20 Pa
mechanical vibrations with 4 g and
5 … 100 Hz, tested acc. to the regulations of
German Lloyd GL characteristics 2
Operating conditions
1)
2)
3)
4)
To maintain the housing protection, a seal
suitable for the cable should be used in the
cable entry. If the seal used does not fit the
cable, it should be exchanged for a suitable
one.
Relating to the nominal range.
In the compensated temperature range of
0°C … +80°C, reference temperature 20°C.
Acc. to IEC 770, point 6.1.2 relating to the
nominal range.
Process pressure transmitters
Ambient conditions
Ambient temperature
- with indicating module
Storage and transport temperature
Product temperature, depending on the
seal material of the measuring cell
- Viton
- EPDM
- Hifluor
- Kalrez
-40°C … +85°C
-20°C … +70°C
-40°C … +85°C
-20°C … +100°C
-40°C … +100°C
-10°C … +100°C
0°C … + 100°C
21
Technical data
4.4 VEGABAR 41
Mechanical data
Materials, wetted parts
Process fitting
Diaphragm
Extension
stainless steel 1.4571
stainless steel 1.4571, Hastelloy C276, Tantalum,
PTFE foil on 1.4571
stainless steel 1.4571
Materials, non-wetted parts
Housing
- optional
Ground terminals
Window of the indicating module
high resistance plastic PBT (Polyester)
Alu die casting, powder-coated
stainless steel 1.4305
Lexan
Weights
VEGABAR
approx. 0.8 … 8 kg (depending on the isolating
system)
Adjustment and indicating elements
Adjustment of the basic functions
Menu-driven adjustment with additional function
adjustment elements
indicating elements
Indicating module
2 keys, 1 rotary switch
4 keys
DOT matrix display, 3 lines with 7 figures each
LC display with
- bar graph (20 segment)
- digital value (4-digit)
- tendency indicators for rising or falling values
Electrical data
Adjustment ranges
Zero
Span
adjustable from -20 … +95 % of nominal range
adjustable from 3.3 … 120 % of nominal range
Supply and signal circuit with 4 … 20 mA and HART® version
12 … 36 V DC
18 … 36 V DC
USS ≤ 1 V
USS ≤ 10 mV (only with HART® version)
3.8 … 20.5 mA
6 µA
approx. 22 mA
22 mA (3.6 mA)
0 … 10 s adjustable
85 ms (ti = 0 sec; 0 – 63 %)
2-wire
depending on the supply voltage
(see load diagram)
Load RLtotal in Ohm
Supply voltage
Exd version (pressure-tight encapsulation)
Permissible residual ripple
- at 500 Hz … 10 kHz
Output signal
- range
- resolution
Current limitation
Fault signal
Integration time
Rise time
Connection cable
Max. permissible load
1000
750
500
250
0
12
18
24
30
36
Voltage of the external
energy UH in Volt
Supply and signal circuit with Profibus PA version
Supply voltage
Current consumption
Integration time
Rise time
22
9 … 32 V DC
(provided by the segment coupler)
10 mA ± 1 mA
0 … 50 s
85 ms (ti = 0 sec; 0 – 63 %)
Process pressure transmitters
Technical data
Indication and adjustment circuit
For connection to
Data transmission
Connection cable
Max. cable length
VEGADIS 10 and/or indicating module
digital
4-wire (standard cable)
25 m
Connection
Cable entry
Screw terminals
M20 x 1.5 (for cable ø 5 … 10 mm)
for wire cross section up to 2.5 mm2
Protective measures
Protection 1)
Protection class
Overvoltage category
IP 65
III
III
Accuracy (similar to DIN 16 086, DIN V 19 259 - 1 and IEC 770)
Deviation
Reference conditions (acc. to IEC 770)
- temperature
- rel. humidity
- air pressure
Determination of characteristics
Characteristics
Deviation in characteristics 2)
- Turn Down 1 : 1
- Turn Down up to 1 : 5
- Turn Down up to 1 : 10
Hysteresis 2)
Repeatability 2)
15°C … 35°C
45 % … 75 %
860 mbar … 1060 mbar/86 kPa … 106 kPa
limit point adjustment acc. to DIN 16 086
linear
< 0.25 % with accuracy class 0.25
< 0.1 % with accuracy class 0.1
typ. < 0.3 % with accuracy class 0.25
typ. < 0.1 % with accuracy class 0.1
typ. < 0.4 % with accuracy class 0.25
typ. < 0.2 % with accuracy class 0.1
< 0.02 %
< 0.02 %
Influence of the ambient temperature
Average temperature coefficient of the zero signal 2) 3)
- Turn Down 1 : 1
< 0.15 %/10 K with accuracy class 0.25
< 0.05 %/10 K with accuracy class 0.1
- Turn Down up to 1 : 5
typ. < 0.225 %/10 K with accuracy class 0.25
typ. < 0.075 %/10 K with accuracy class 0.1
- Turn Down up to 1 : 10
typ. < 0.3 %/10 K with accuracy class 0.25
typ. < 0.1 %/10 K with accuracy class 0.1
Long-term stability
Long-term drift of the zero signal 2) 4)
< 0.1 % 2 years each
Other actuating variables
Calibration position
Influence of the installation position
Vibration resistance
upright, diaphragm points downwards
< 0.2 mbar/20 PA
mechanical vibrations with 4 g and
5 … 100 Hz, tested acc. to the regulations of
German Lloyd GL regulation 2
Operating conditions
Ambient conditions
1)
2)
3)
4)
To maintain the housing protection, a seal
suitable for the cable should be used in the
cable entry. If the seal used does not fit the
cable, it should be exchanged for a suitable
one.
Relating to the nominal range.
In the compensated temperature range of
0°C … +80°C, reference temperature 20°C.
Acc. to IEC 770, point 6.1.2 relating to the
nominal range.
Process pressure transmitters
Ambient temperature
- with indicating module
Storage and transport temperature
-40°C … +85°C
-20°C … +70°C
-40°C … +85°C
23
Technical data
4.5 VEGABAR 44
Mechanical data
Materials, wetted parts
Process fitting
Diaphragm
Seal measuring cell
brass 2.041, stainless steel 1.4571
sapphire ceramic® (99.9 % Oxydeceramic)
Viton, EPDM, Hifluor, Kalrez
Materials, non-wetted parts
Housing
- optional
Ground terminal
Window of the indicating module
high resistance plastic PBT (Polyester)
Alu die casting, powder-coated
stainless steel 1.4305
Lexan
Weight
VEGABAR
approx. 0.8 … 2 kg (depending on process fitting)
Adjustment and indicating elements
Adjustment of the basic functions
2 keys, 1 rotary switch
Menu-driven adjustment of the additional function
- adjustment elements
4 keys
- indicating elements
DOT matrix display, 3 lines with 7 figures each
Indicating module
LC display with
- bar graph (20 segments)
- digital value (4-digit)
- tendency indicators for rising or falling values
Electrical data
Adjustment ranges
Zero
Span
adjustable from -20 … +95 % of nominal range
adjustable from 3.3 … 120 % of nominal range
Supply and signal circuit with 4 … 20 mA and HART® version
12 … 36 V DC
18 … 36 V DC
USS ≤ 1 V
USS ≤ 10 mV (only with HART® version)
3.8 … 20.5 mA
6 µA
approx. 22 mA
22 mA (3.6 mA)
0 … 10 s adjustable
85 ms (ti = 0 sec; 0 – 63 %)
2-wire
depending on the supply voltage
(see load diagram)
Load RLtotal in Ohm
Supply voltage
Exd version (pressure-tight encapsulation)
Permissible residual ripple
- at 500 Hz … 10 kHz
Output signal
- range
- resolution
Current limitation
Fault signal
Integration time
Rise time
Connection cable
Max. permissible load
1000
750
500
250
0
12
18
24
30
36
Voltage of the external
energy U H in Volt
Supply and signal circuit with Profibus PA version
Supply voltage
Current consumption
Integration time
Rise time
24
9 … 32 V DC
(provided by the segment coupler)
10 mA ± 1 mA
0 … 50 s
85 ms (ti = 0 sec; 0 – 63 %)
Process pressure transmitters
Technical data
Indicating and adjustment circuit
For connection to
Data transmission
Connection cable
Max. cable length
VEGADIS 10 and/or indicating module
digital
4-wire (standard cable)
25 m
Connection
Cable entry
Screw terminals
M20 x 1.5 (for cable ø 5 … 10 mm)
for wire cross section up to 2.5 mm2
Protective measures
Protection 1)
Protection class
Overvoltage category
IP 65
III
III
Accuracy (similar to DIN 16 086, DIN V 19 259 - 1 and IEC 770)
Deviation
Reference conditions (acc. to IEC 770)
- temperature
- rel. humidity
- air pressure
Determination of characteristics
Characteristics
Deviation in characteristics 2)
- Turn Down 1 : 1
- Turn Down up to 1 : 5
- Turn Down up to 1 : 10
Hysteresis 2)
Repeatability 2)
15°C … 35°C
45 % … 75 %
860 mbar … 1060 mbar/86 kPa … 106 kPa
limit point adjustment acc. to DIN 16 086
linear
< 0.25 % with accuracy class 0.25
< 0.1 % with accuracy class 0.1
typ. < 0.3 % with accuracy class 0.25
typ. < 0,1 % with accuracy class 0.1
typ. < 0.4 % with accuracy class 0.25
typ. < 0.2 % with accuracy class 0.1
< 0.02 %
< 0.02 %
Influence of the ambient temperature
Average temperature coefficient of the zero signal 2) 3)
- Turn Down 1 : 1
< 0.15 %/10 K with accuracy class 0.25
< 0.05 %/10 K with accuracy class 0.1
- Turn Down up to 1 : 5
typ. < 0.225 %/10 K with accuracy class 0.25
typ. < 0.075 %/10 K with accuracy class 0.1
- Turn Down up to 1 : 10
typ. < 0.3 %/10 K with accuracy class 0.25
typ. < 0.1 %/10 K with accuracy class 0.1
Long-term stability
Long-term drift of the zero signal 2) 4)
< 0.1 % 2 years each
Other actuating variables
Calibration position
Influence of the calibration position
Vibration resistance
upright, diaphragm points downwards
< 0.2 mbar/20 Pa
mechanical vibrations with 4 g and
5 … 100 Hz, tested acc. to regulations of
German Lloyd GL regulation 2
Operating conditions
Ambient conditions
1)
2)
3)
4)
To maintain the housing protection, a seal
suitable for the cable should be used in the
cable entry. If the seal used does not fit the
cable, it should be exchanged for a suitable
one.
Relating to the nominal range.
In the compensated temperature range of
0°C … +80°C, reference temperature 20°C.
Acc. to IEC 770, point 6.1.2 relating to the
nominal range.
Process pressure transmitters
Ambient temperature
- with indicating module
Storage and transport temperature
Product temperature, depending on the
seal material of the measuring cell
- Viton
- EPDM
- Hifluor
- Kalrez
-40°C … +85°C
-20°C … +70°C
-40°C … +85°C
-20°C … +100°C (1 h up to 140°C)
-40°C … +100°C (1 h up to 140°C)
-10°C … +100°C (1 h up to 140°C)
0°C … +100°C (1 h up to 140°C)
25
Technical data
4.6 VEGADIS 10
General
Housing material
Indication window
Breather facility
Weight
plastic PBT
glass
PTFE filter element 1)
approx. 350 g
Adjustment and indicating elements
Adjustment of the basic functions
Menu-driven adjustment with additional function
- adjustment elements
- indicating elements
Indicating module
2 keys, 1 rotary switch
4 keys
DOT matrix display, 3 lines with 7 figures each
LC display with
- bar graph (20 segments)
- digital value (4-digit)
- tendency indicators for rising or falling values
Connection
Cable entry
Screw terminals
Pg 13.5 (for cable ø 5 … 10 mm)
for wire cross sections up to 2.5 mm2
Adjustment circuit
Connection to
Connection cable
Cable length
VEGABAR process pressure transmitters
4-wire (standard cable)
max. 25 m
Ambient conditions
Ambient temperature
- VEGADIS 10
- indicating module
Storage and transport temperature
-40°C … +85°C
-20°C … +70°C
-40°C … +85°C
Electrical protective measures
Protection 2)
IP 65
CE conformity
VEGADIS 10 meets the protective regulations of EMC (89/336/EWG) and NSR (73/23/EWG). The
conformity has been judged acc. to the following standards:
EMC
Emission
EN 50 081 - 1
Susceptibility
EN 50 082 - 2
NSR
EN 61 010 - 1
1)
2)
26
Air permeable and moisture offering.
To maintain the housing protection, a seal
suitable for the cable should be used in the
cable entry. If the seal used does not fit the
cable, it should be exchanged for a suitable
one.
Process pressure transmitters
Technical data
4.7 Ex technical data
Classification mark
VEGABAR 40 … 44 Ex
VEGADIS 10 Ex
EEx ia IIC T6, T5, T4
EEx ia IIC T6, T5, T4
Intrinsically safe supply and signal current circuit VEGABAR 40 … 44 Ex
Flame proofing
Max. values
- supply voltage
- current
- power
Inner effective capacitance
Inner effective inductance
EEx ia IIC
UO = 29 V
IK = 116 mA
P = 841 mW
Cint = 1 nF
Lint = 0.17 mH
or
UO = 24 V
IK = 131 mA
P = 786 mW
Intrinsically safe indicating and adjustment circuit VEGABAR 40 … 44 Ex
Flame proofing
Only for connection to
Max. permissible outer capacitance
Max. permissible outer inductance
EEx ia IIC
VEGADIS 10 Ex and/or indicating module
Cext = 824 nF
Lext = 62 µH
When using adjustment and indicating modules, the following values must be deducted from the max.
permissible outer capacitance:
- adjustment of the basic function
200 nF
- menu-driven adjustment
with additional functions
600 nF
- indicating module
200 nF
The values for the electronics for connection to VEGA signal conditioning instruments, without
adjustment with factory setting as well as of VEGADIS 10 Ex are negligible.
Intrinsically safe input VEGADIS 10 Ex
Flame proofing
Inner effective capacitance
Inner effective inductance
EEx ia IIC
Cint negligible
Lint negligible
Ambient conditions
VEGABAR 40 … 44 Ex
Ambient temperature around the
oscillator
-40°C … +40°C
-40°C … +55°C
-40°C … +85°C
Temperature class
Ignition temperature
T6
T5
T4
85°C
100°C
135°C
VEGADIS 10 Ex
Ambient temperature
-40°C … +50°C
-40°C … +65°C
-40°C … +70°C
Temperature class
T6
T5
T4
Ignition temperature
85°C
100°C
135°C
Note:
Temperature class T6 refers to combustible gases, vapours and fog which are easily ignitable, i.e. this
is the highest order temperature class. The temperature classes T5 and T4 are automatically included.
Process pressure transmitters
27
Technical data
4.8 Dimensions
Housing dimensions VEGABAR 14 with process fittings
Version with plug connection
36
Version with direct cable outlet
153
25
49,5
45
124
ø38
3
G½A
GP
GR
20
ø11,4
5
ø17,5
G½A
36
25
20
15
36
25
G½A
ø17,5
36
25
ø6
½" NPT
ø11,4
G¼
ø3
¼" NPT
31
20
3
31
20
25
5
36
SW 27
ø3
½" NPT
ø6
M20x1,5
GN
28
GA
GB
Process pressure transmitters
Technical data
Housing dimensions VEGABAR 15
Version with internal sensor element
Version with flush diaphragm
131
36
34
20
20
5
38
SW 27
ø6
G½A
G½A
ø 33
Process pressure transmitters
29
Technical data
Housing dimensions VEGABAR 40/41/44 (without process fittings)
without indicating module
with indicating module
85
~76
72
82
Version
plastic PBT
M20x1,5
90
Ground connection
~76
82
Version
Alu die casting
M20x1,5
Ground connection
82
78
90
~76
156
Version
Alu die casting in
EExd
½" NPT
Ground connection
30
Process pressure transmitters
Technical data
Dimensions process fittings VEGABAR 40 (here with plastic housing)
without indicating module
85
with indicating module
~76
174
164
M20x1,5
92
92
92
Ground connection
¼" NPT
20
25
5
25
20
15
25
SW 27
ø 11,4
ø3
ø6
½" NPT
½" NPT
M20x1,5
G½A
G¼
ø 17,5
G½A
GM/GV
Process pressure transmitters
ø 11,4
ø 17,5
G½A
GP
5
92
25
3
20
3
20
5
25
ø3
ø6
GA
87
GB
87
92
GN
ø3
ø6
G½A
GR
GI
31
Technical data
51
Dimensions process fittings VEGABAR 41 (here with plastic housing without indicating module)
D
b
k
d2
d4
d5
f
RL
dM
f
b
d2
d4
RL
k
D
=
=
=
=
=
=
=
=
=
outer flange diameter
flange thickness
diameter of hole circle
diameter of holes
seal ledge diameter
extension diameter
seal ledge strength
extension length
diaphragm diameter
FA, FB, FC
FH
FN, FO
d5
FE, FG, FK
Flange connection acc. to DIN 2501, seal ledge acc. to DIN 2526 form D
Order
code
Flange
Size
D
b
Holes
k
No.
d2
Seal ledge
d4
f
Extension
RL
d5
dM
FA
FB
FC
FE
FG
FH
FK
DN 25 / PN 40
DN 40 / PN 40
DN 50 / PN 40
115
150
165
22
18
20
85
110
125
4
4
4
14
18
18
68
88
102
2
3
3
DN 80 / PN 40
200
24
160
8
18
138
3
––
––
––
100
200
––
100
––
––
––
47
47
––
72
51
92
2
6.4
––
––
––
48.3
48.3
––
76
Flange connection acc. to ANSI B 16.5, seal ledge RF
FN
FO
32
DN 1" / 300 lbs
DN 2" / 600 lbs
125
165
22
32
89
127
4
8
20
20
Process pressure transmitters
Technical data
60
D
Order
code
DN
PN
D
Mb
RC
50
6 … 400
95
54.5
Mb
Tube isolator for mounting between
flanges with connection acc. to DIN
2501
L2
g
DN
PN
G1
L2
D2
d6
g
m
RF
50
25
Rd78x1/6
156
70
68.5
11
18
D2
Order
code
d6
Tube isolator with connection acc. to DIN 11 851
PN
L
D
d
D1
D2
Mb
RH
2"
40
156
64
56.3
56
75
48
Process pressure transmitters
D2
DN
D
d
Mb
Order
code
D1
L
Tube isolator with Clamp connection
33
Technical data
Dimensions process fittings VEGABAR 44 (here plastic housing)
without indicating module
85
with indicating module
131
121
~76
M20x1,5
25
25
49
49,5
Ground connection
24,5
G 1½ A
ø 55
ø 60
GG
GW
1½ " NPT
GN
34,5
G 1½ A
21
51,5
64
SW 46
82
82
39
49
SW 60
M44 x 1,25
ø 78
ø 90
ø 64
BA/BB
LA
LB
CA
ø 84
ø 78
64
64
64
64
SW 46
ø 65,8
ø 92
ø 105
RA
RB
51,5
64
SW 46
ø 100
AA
20,5
TA
ø 100
ø 165
PA
34
FW
Process pressure transmitters
Technical data
Dimensions VEGADIS 10
without indicating module
38
72
85
118
108
135
ø5
M20x1,5
with indicating module
82
Process pressure transmitters
35
Mounting
5 Mounting
5.1 Mounting instructions
5.2 Mounting VEGADIS 10
VEGABAR can be mounted in any position. The cable entry should point
downward to avoid humidity ingress.
For this purpose, the housing of
VEGABAR 40 … 44 can be rotated by
330° against the mounting body.
VEGADIS 10 can be mounted in the
following ways:
- on carrier rail 35 x 7.5 acc. to
EN 50 022
- on mounting bracket or on the wall.
It is necessary to use a gasket for
mounting. This is either supplied with
VEGABAR or must be provided by the
user.
Compensation of the atmospheric pressure
The atmospheric pressure of instruments used for gauge measurement
is compensated via a breather facility
integrated in the housing.
36
Process pressure transmitters
Electrical connection
6 Electrical connection
6.1 Connection instructions
The electronics in VEGABAR requires
a supply voltage of 12 … 36 V DC. It is
provided in two-wire technology, i.e.
supply voltage and current signal are
looped via the same two-wire cable to
the terminals.
This external energy is provided via a
separate power supply unit:
- power supply unit, e.g. VEGASTAB
690
- processing unit with integral DCcurrent source (e.g. active DCSinput)
- VEGAMET or VEGADIS 371
Make sure that the external supply is
reliably isolated from the mains circuits acc. to DIN VDE 0106, part 101.
The above mentioned VEGA instruments meet this requirement and protection class III is hence ensured.
The external supply must provide a
terminal voltage of at least 12 V to the
transmitter. The actual terminal voltage on the transmitter depends on the
following factors:
- output voltage of the external power
supply under nominal load.
- electrical resistances of the connected instruments in the circuit
(see connected instruments, load
resistance).
Note the following instructions for
electrical connection:
- The connection must be made acc.
to the local installation standards
(e.g. in Germany acc. to the VDEregulations).
- The terminal voltage must not exceed 36 V to avoid damage to the
electronics.
- The electrical connection is provided with a reverse polarity protection.
- The wiring between VEGABAR and
power supply can be made with
standard two-wire cable.
- If strong electromagnetic interferences are expected, screened cable is recommended. The screening must be earthed at one side on
the sensor.
- If overvoltages are expected, we
recommend the installation of VEGA
overvoltage arresters.
- A seal suitable for the cable must be
used in the cable entry.
- With instrument version EExd (pressure-tight encapsulation) screened
cable must be used for the instrument connection. Observe the
mounting regulations.
Note the following instructions for
electrical connection:
- The connection must be made acc.
to the local installation standards
(e.g. in Germany acc. to the VDEregulations).
- The electrical connection must
have a protective measure against
polarity reversal.
- The connection of field instruments
is generally made via T-adapters on
stubs.
- Screened cable is recommended
for connection (cable types see
chapter "Technical data"). The
shielding must be grounded on both
ends (on the T-adapter and on the
connection housing).
- For use in Ex areas, the installation
regulations must be observed.
Connection instructions for
Profibus PA instruments
The electronics in process pressure
transmitters for Profibus PA requires a
supply voltage of 9 … 32 V DC. The
supply voltage and the digital output
signal are led via the same two-wire
connection cable to the terminals.
The external energy is provided by a
segment coupler.
Process pressure transmitters
37
Electrical connection
6.2 Connection plans
VEGABAR 14/15 with plug connection DIN 43 650 A
VEGABAR 14 with direct cable outlet
Breather capil- Suspenlaries
sion
cable
+ Supply voltage
– 12 … 30 V DC
1
br
+
3
+
bl
–
–
2
ye free
RL
RL
+
Cable
screen
Power supply
12 … 30 V DC
+
–
–
VEGABAR 40 … 44 (4 … 20 mA and HART ®) with indicating module and VEGADIS 10
Note:
An ammeter for local inspection of the output current can be connected to terminals 1 and 3. This measurement can be made during operation, without interrupting the supply cable.
Ammeter for local
inspection
Function
earth1)
Plug connection
1
2
3
5
6
7
Indicating module
VEGADIS 10 with indicating module
8
rd wt vio or
0 - 20 bar
0 - 20 bar
+ –
Supply voltage
12 … 36 V DC
VEGABAR 40 … 44 (Profibus PA) with indicating module and VEGADIS 10
Ammeter for local
inspection
Indicating module
Function
earth 1)
1
+
VEGADIS 10 with indicating module
Plug connection
2
3
5
6
7
8
–
0 - 20 bar
0 - 20 bar
PA +
PA –
Profibus PA field distributor
1)
38
If a screened cable is used, the screen should be connected to function ground in the terminal box and the ground terminal on the housing exterior grounded
according to the instructions. Both terminals are connected to each other in the housing.
Process pressure transmitters
Electrical connection
6.3 Connection examples
6.4 Connection instructions
for Ex-applications
Supply via a power supply unit
Applications in Ex-areas acc. to
- CENELEC Ex-regulations
- PTB (Germany) Zone 0
require the use of approved instruments.
Conditioning via an indicating instrument.
Ammeter for local
inspection
+
1
analogue / digital
indicating instrument
Terminals
– – VEGABAR
40 … 44
(4 … 20 mA or
2 3
HART®)
For these applications, note the appropriate official documents (test reports, test certificates and conformity
certificates). These are supplied with
the respective instrument.
–
~
+
For applications in Ex-area, the supply voltage must be in the range of
12 … 29 V and must only be made via
an intrinsically safe circuit. The following options are available:
- VEGAMET signal conditioning instrument in Ex-version
- non-certified VEGAMET signal conditioning instruments with VEGAsafety barrier type 145
- Ex-separator (VEGATRENN 544 Ex)
- VEGADIS 173 indicating and power
supply unit in Ex-version
Power supply
unit
Supply via a DCS with active input circuit
Conditioning via a DCS with active input circuit.
Ammeter for local
inspection
+
1
–
2
Terminals
VEGABAR
40 … 44
(4 … 20 mA or
HART®)
–
3
–
PLC
The official documents of these instruments must also be noted.
+
Supply via segment coupler (Profibus PA)
Ex area
Non Ex area
Terminals
VEGABAR 40 … 44
(Profibus PA)
1
2
Segment
coupler
3
Profibus PA
cable
PA +
PA –
Profibus PA
Profibus DP
Field distributor
Note:
Max. 32 instruments can be connected to a
Profibus PA branch in non Ex area,
- approx. 20 instruments with EEx ia/ib IIB,
- approx. 10 instruments with EEx ia/ib IIC,
(depending on the power consumption of
the instruments).
Process pressure transmitters
Supply for instruments
on Profibus PA branch
39
Electrical connection
6.5 Connection examples for Ex-applications
Supply voltage by the Ex-separator
Conditioning via an indicating instrument through the non-Ex area. In addition, a
VEGADIS 10 Ex can be connected.
Non Ex area
Ex area
+
–
1
2
– Terminals VEGABAR
40 … 44 (4 … 20 mA
3 or HART® )
Ex separator
–
+
=
~
4 … 20 mA
Indicating
instrument
Supply voltage via a VEGA non-Ex signal conditioning instrument
with safety barrier type 145
Conditioning via the signal conditioning instrument. In addition, a VEGADIS 10 Ex
can be connected.
Ex area
Non Ex area
Terminals
± VEGABAR
40 … 44
(4 … 20 mA or
1 2 3
HART®)
+
±
Safety barrier
type 145
VEGAMET in non Ex
version
Adjustment
It is absolutely necessary that the safety barrier is connected during adjustment.
Reason: The internal power consumption of the safety barrier (approx. 300 µA)
must be taken into account for the adjustment.
40
Process pressure transmitters
Hot steam measurement with VEGABAR 40
7 Hot steam measurement with VEGABAR 40
With VEGABAR 40, hot steam can be
measured without the use of isolating
systems for temperature decoupling.
Ring pipe
For this purpose, VEGA offers as accessory special siphons acc. to DIN
16 282 with connection tap on the
pressure extraction side (see chapter
"9 Accessories"). The function of the
siphon is to cool the process temperature of the hot steam. The cooling
is done via a condensate chamber in
a U-tube or a ring tube.
In practice, the rule of thumb is as follows:
A siphon in ring or U form filled with
condensate can cool the medium
(steam) by approx. 100°C.
If there are still higher product temperatures in front of the siphon, a tube
of sufficient length must be provided
between the siphon and the measuring instrument for heat dissipation.
In power stations, for example, tubes
three or four meters in length, depending on the steam temperature,
are often welded in to provide cooling
distance.
U form
Hot steam
Condensate
pipe
Hot steam
Condensate
Mounting instructions
For wall, tube or stand mounting of
VEGABAR 40, VEGA offers a bracket
for measuring instruments acc. to DIN
16 281, as well as the required
adapter as supplementary accessory
(see chapter "9 Accessories").
Condensate
pipe
Condensate
Process pressure transmitters
41
Pressure transmitters with isolating diaphragms
8 Pressure transmitters with isolating diaphragms
8.1 General information on
isolating diaphragms
Isolating diaphragms transfer the
measured pressure of the substance
to the pressure transmitter, if for certain reasons, the pressure transmitter
should or cannot come into contact
with the measured substance.
Isolating diaphragms and pressure
transmitters form a complex measuring system, the accuracy of which is
influenced by many factors. The optimum dimensioning for solving an individual measuring problem can only
be carried out if the operating conditions are exactly known.
The goal of this presentation is to
show the problem involved with isolating systems and to give basic information on possible solutions.
42
8.2 Applications
8.3 Function
There are many reasons why a separator between measured substance
and pressure transmitter might be
necessary:
• The measured substance is corrosive. The sensor element cannot be
protected effectively.
• The measured substance is highly
viscous. The often inevitable dead
zones of the pressure transmitter
cause measuring problems.
• The measured substance crystallizes, especially in dead zones.
• The measured substance polymerizes. Connection tubes to the pressure transmitter can clog.
• The measured substance is heterogeneous, e.g. fibrous; buildup and
unmixing are caused in dead zones.
• The measured substance has a very
high temperature. An unwanted temperature increase is caused in the
pressure transmitter.
• The measurement location is unfavourable. Due to space reasons,
the pressure transmitter cannot be
mounted or read correctly. The pressure transmitter is connected to the
isolating diaphragm via a capillary
line so that mounting in a more favourable place is possible.
• Hygienic regulations must be observed for the measured substance.
Bacterial growth can result in corners which are difficult to clean.
The function of an isolating diaphragm is best shown in a diagram.
The pressure to be detected is transferred via the separating diaphragm
and the oil filling to the sensor element.
CERTEC®
Oil filling for pressure transmission
Separating diaphragm
Construction of an isolation diaphragm
Process pressure transmitters
Pressure transmitters with isolating diaphragms
8.4 Selection criteria
Isolating systems have a characteristic temperature reaction which can
substantially influence the measurement. To reduce this influence to a
minimum, some important factors
should be considered.
First of all, the diaphragm diameter
should be as large as possible. Reason: Diaphragms with small diameters are more rigid than those with
larger diameters. The temperature
dependent expansion of the isolating
liquid is better compensated by a diaphragm with larger diameter (larger =
more elastic) as the diaphragm compensates a part of the isolation liquid
expansion. This selection criterion is
of course limited by the required process connection.
The second possibility for optimising
the temperature reaction is the thickness of the separating diaphragm.
Here is valid: the thicker the diaphragm, the worser the temperature
coefficient! Usual diaphragm thicknesses are between 50 µm and
100 µm. However the mechanical
ruggedness should be always taken
into account, as a thin diaphragm can
be easily damaged by carelessness
or substances containing solids.
The selection of the fill fluid (e.g. silicone oil, water-glycerine) also offers
the possibility to influence the temperature reaction, as the liquids have
different temperature expansion coefficients. The characteristics of different fill fluids are discussed in detail
later on.
8.5 Error calculation
The necessary oil volume for filling
the isolating system must also be considered. However, the mechanical
design is usually such that the required oil volume is already minimised and therefore no realistic
optimisation possibilities exist.
In general, the selection of the separating diaphragm material also offers a means for optimisation. In practice, however, it is a matter of fact that
the diaphragm material is primarily
determined by the product compatibility.
Additional characteristic properties
result from the design of the isolating
system.
Quick temperature changes will
reach the sensor element considerably damped. This eliminates the
sometimes unfavourable temperature
shock reaction of the CERTEC® cell
and also reduces temperature-related ageing effects. One disadvantage of the temperature decoupling is
that the read-out temperature values
correspond only in a few cases to the
actual product temperature.
Another aspect is the noticeable reduction of dynamic pressure peaks
by the transmitting oil, which also has
a positive effect on the reliability of the
pressure transmitter.
The influence of an isolating system
is primarily determined by the temperature of the isolating liquid.
The total temperature error is the sum
of the temperature dependencies of
the pressure transmitter and the isolating system.
TKTot = TKIsolating system + TKPressure transmitter
Example:
The selected pressure transmitter has
- a nominal range of 0 … 1 bar and
- a TK of 0.05 %/10 K (see technical
data).
This corresponds to a TKPressure transmitter
of 0.5 mbar/10K.
The isolating diaphragm used has a
temperature influence of 2.7 mbar/
10 K
TKTot = TKIsolating diaphragm + TKPressure transmit.
= 2.7 mbar/10K + 0.5 mbar/10 K
= 3.2 mbar /10 K
The determined total temperature error corresponds therefore to 0.32 %/
10 K!
Due to these dependencies, there are
limitations on the available nominal
measuring ranges, depending on the
nominal width of the isolating system.
This limitation results from the fact
that the temperature errors of the isolating systems must be seen as absolute values and therefore have a considerable influence on the total error
small nominal measuring ranges.
Nom. width of the Nom. meas. ranges
isolating system in bar
0 – 0.4
0 – 1…60
Process pressure transmitters
DN 25
––
x
DN 40/1"
––
x
DN 50/2"
––
x
DN 80/3"
x
x
43
Pressure transmitters with isolating diaphragms
To reduce the total error of the pressure transmitter to a minimum, it is necessary to use a pressure transmitter in the best
available accuracy class (especially for small measuring ranges as well as small nominal widths!).
The following table gives an overview of the temperature dependencies of different standard versions.
VEGA
Code
Designation
Error in mbar/10 K
Direct connec- additional
tion
cooling element
FA
Flange DN 25 PN 40 acc. to DIN 2501,
seal surface acc. to DIN 2526 Form D;
reset diaphragm
1.8
2.6
FB
Flange DN 40 PN 40 acc. to DIN 2501,
seal surface acc. to DIN 2526 Form D
1.9
2.1
FC
Flange DN 50 PN 40 acc. to DIN 2501,
seal surface acc. to DN 2526 Form D
2.0
3.2
FE
Flange DN 50 PN 40 with extension 100 mm
1.9
2.1
FH
Flange DN 80 PN 40 acc. to DIN 2501,
seal surface acc. to DIN 2526 Form D
0.4
0.3
FK
Flange DN 80 PN 40 with extension 100 mm
1.0
1.0
FN
Flange DN 1" 300 lbs acc. to ANSI B 16.5,
seal surface RF
1.8
2.6
FO
Flange DN 2" 600 lbs acc. to ANSI B 16.5,
seal surface RF
2.0
3.2
RC
Tube isolating diaphragm for mounting
between DN 50 flange
3.6
2.2
RF
Tube isolating diaphragm with hygienic fitting
DIN 11851 DN 50 (groove nut on both ends)
4.0
2.2
RH
Tube isolating diaphragm with TRI-Clamp 2" connection
4.2
2.3
LA
Hygienic fitting with
groove nut F40 PN 25
7.0
7.6
LB
Hygienic fitting with tension flange
DN 32 PN 25
7.0
7.6
CA
TRI-Clamp 2" PN 10
7.0
7.6
When using capillary lines, an additional error of 0.1 … 15 mbar/10 K per meter must be considered in general (also depending on the diameter of the separating diaphragm). In these applications, a requested temperature gradient between measurement loop and mounting location of the pressure transmitter results, so that an examination of the temperature influences
is very difficult to present and is therefore not listed in the table.
The error values relate to the following products:
Silicone oil, vegetable oil, high temperature oil, medical white oil (Essomarcol).
When using water-glycerine, the error values will be reduced by a factor of 0.65 as this fill fluid has a lower temperature
expansion coefficient.
44
Process pressure transmitters
Pressure transmitters with isolating diaphragms
8.6 Application temperatures
Isolating systems extend the product
temperature range of pressure transmitters considerably. Therefore make
sure that the ambient temperature on
the pressure transmitter does not exceed the max. specified value. In critical applications, the use of a cooling
element or a capillary must be taken
into consideration.
Isolating liquid
The application temperatures are limited by the max. permissible ambient
temperature of the pressure transmitter (85°C) as well as the different thermal characteristics of the isolating
liquids.
In addition, take into consideration
that when pressures below 1 barabs
occur, the isolating liquids boil even
at low temperatures. The following
limit values result thereof:
permissible temperature range
Pressure > 1 barabs Pressure < 1 bar abs
Pressure > 0 barrel Pressure < 0 bar rel
Silicone oil
-40°C … +130°C
-40°C … +130°C
Silicone oil and cooling element
-40°C … +200°C
-40°C … + 130°C
Silicone oil and capillaries (1 m)
-40°C … +200°C
-40°C … +130°C
Vegetable oil
-10°C … +130°C
-10°C … +130°C
Vegetable oil and cooling element
-10°C … +250°C
-10°C … +130°C
High temperature oil and cooling element
-10°C … +400°C
-10°C … +200°C
High temperature oil and capillaries (1 m)
-10°C … +400°C
-10°C … +200°C
Medical white oil (Essomarcol)
-40°C … 130°C
-40°C … +130°C
Water-glycerine
-40°C … +130°C
-40°C … +130°C
Process pressure transmitters
45
Accessories
9 Accessories
Cut-off valve form A
with tension sleeve
G½
20
ø 63
100
- stainless steel ................................ Article no. 2.20057
- steel ................................................ Article no. 2.20056
ø6
G½
79
18
ø 26 h11
28
- stainless steel ................................ Article no. 2.20059
- steel ................................................ Article no. 2.20058
G½
117
100
Cut-off valve form B
with rotary sleeve and shaft
for measuring instrument holder
G½
Cut-off valve form B-AS12
with rotary sleeve and shaft
for measuring instrument holder;
with cutting ring screwing
- stainless steel ................................ Article no. 2.20219
- steel ................................................ Article no. 2.20218
Manometer connection tube
straight;
with welding connection and tension sleeve
100
- stainless steel ................................ Article no. 2.24462
- steel ................................................ Article no. 2.24463
G½
2,6
ø 20
46
Process pressure transmitters
Accessories
Manometer connection tube
Quadrant pipe 90°;
with weld connection and tension sleeve
G½
2,6
ø 20
100
- stainless steel ................................ Article no. 2.19990
- steel ................................................ Article no. 2.19989
100
Manometer connection tube
Quadrant pipe 90°;
with connection G 1/2 A and tension sleeve
3
ø 20
20
2,6
ø6
G½
- stainless steel ................................ Article no. 2.24480
- steel ................................................ Article no. 2.24481
100
G½
100
Adapter
with measuring instrument holder
with connection G1/2 A acc. to DIN 16 281
20 30
75
19
G½
ø 26 h11
- stainless steel ................................ Article no. 2.20504
- steel ................................................ Article no. 2.20503
- brass ............................................... Article no. 2.20502
ø6
G½
Siphon in U-form
for horizontal pressure extraction
with connection G 1/2 A and tension sleeve
180
145
G½
155
200
G½
ø6
- stainless steel ................................ Article no. 2.19993
- steel ................................................ Article no. 2.19991
56
Siphon in U-form
for horizontal pressure extraction
with weld connection and tension sleeve
ø 20
2,6
- stainless steel ................................ Article no. 2.25241
- steel ................................................ Article no. 2.25240
145
Process pressure transmitters
47
Accessories
Siphon in ring form
for vertical pressure extraction
with connection G 1/2 A and tension sleeve
G½
95
130
- stainless steel ................................ Article no. 2.19994
- steel ................................................ Article no. 2.19992
275
6
110
ø5
G½
Siphon in ring form
for vertical pressure extraction
with weld connection and tension sleeve
110
- stainless steel ................................ Article no. 2.25022
- steel ................................................ Article no. 2.25023
2,6
ø 20
Measuring instrument holder acc. to DIN 16 281
Length 100 mm
Form H for wall fastening
100
65
56
ø7
10
- stainless steel ................................ Article no. 2.20233
- Aluminium ...................................... Article no. 2.20232
ø 26 H11
Measuring instrument holder acc. to DIN 16 281
Length 100 mm
Form A for wall, tube and rack fastening
48
10
28
ø 11
72
- malleable cast iron ........................ Article no. 2.20234
100
72
Process pressure transmitters
Accessories
Welded socket thread G 11/2 A (GG)
G1½
19
- of stainless steel 1.4571 ...................... Article no. 2.21993
- of steel .................................................. Article no. 2.8239
- seal Klingersil ...................................... Article no. 2.4191
- seal lead .............................................. Article no. 2.3437
- seal copper coated ............................. Article no. 2.2503
ø65
21
Welded socket M44x1.25 (BA, BB)
- of stainless steel 1.4571 ...................... Article no. 2.15986
- seal Viton ............................................. Article no. 2.10491
- seal PTFE ............................................. Article no. 2.15185
ø60
- welding dummy brass ......................... Article no. 2.18000
- blind stopper 1.4571 ........................... Article no. 2.16098
21,5
Welded socket TRI-Clamp 11/2"
- of stainless steel 1.4571 ...................... Article no. 2.14140
ø35,6
ø38,6
21,5
Welded socket TRI-Clamp 2" (CA)
- of stainless steel 1.4435 ...................... Article no. 2.10974
- seal EPDM ............................................ Article no. 2.10975
ø48,6
ø51,6
Welded socket DRD PN 40 (AA)
ø84/4xM10
21
- of stainless steel 1.4571 ...................... Article no. 2.10500
- seal PTFE ............................................. Article no. 2.10360
ø125
Process pressure transmitters
49
Accessories
Welded socket hygienic with groove nut (LA)
Rd 65 x 1/6
40
- of stainless steel 1.4435 ...................... Article no. 2.23898
- seal EPDM ............................................ Article no. 2.17682
- welding dummy 1.4305 ....................... Article no. DMONT.A
Ø 79,6
- blind stopper 1.4571 ........................... Article no. DMONT.B
LA
Ø 72/6xM6
Welded socket hygienic with tension flange (LB)
40
- of stainless steel 1.4571 ...................... Article no. 2.18060
- seal EPDM ............................................ Article no. 2.17682
- welding dummy 1.4305 ....................... Article no. DMONT.C
Ø 79,6
- blind stopper 1.4571 ........................... Article no. DMONT.D
LB
Welded socket, threaded pipe coupling DIN 11 851 DN 40 (RA)
Rd 65 x 1/6
33
- of stainless steel 1.4404 ...................... Article no. 2.10955
- seal NBR .............................................. Article no. 2.10956
Ø 38
Ø 43
RA
Welded socket, threaded pipe coupling DIN 11 851 DN 50 (RB)
35
- of stainless steel 1.4404 ...................... Article no. 2.4177
- seal NBR .............................................. Article no. 2.4178
Ø 50
Ø 55
RB
50
Process pressure transmitters
Notes
Process pressure transmitters
51
Level and
Pressure
VEGA Grieshaber KG
Am Hohenstein 113
77761 Schiltach/Germany
Phone +49 (0) 7836 50-0
Fax
+49 (0) 7836 50-201
E-Mail info@de.vega.com
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ISO 9001
All statements concerning scope of delivery, application, practical use and operating conditions of the
sensors and processing systems correspond to the latest information at the time of printing.
52
Technical data subject to alterations
Process pressure20120-EN-010201
transmitters