VEGA DIF55 User Manual
Ope
p
rating Instructions
VEGADIF 55
4 … 20 mA/HART
Differe
ntial pressure
Contents
Conten
1 About this document
2 For your safety
3 Product description
4 Mounting
ts
1.1 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Target group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Symbolism used . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Authorised personnel . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Appropriate use . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Warning about misuse . . . . . . . . . . . . . . . . . . . . . . .
2.4 General safety instructions . . . . . . . . . . . . . . . . . . . .
2.5 Safety approval markings and safety tips . . . . . . . . .
2.6 Safety approval markings and safety tips . . . . . . . . .
2.7 CE conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Safety instructions for Ex areas . . . . . . . . . . . . . . . .
2.9 Environmental instructions . . . . . . . . . . . . . . . . . . . .
3.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Principle of operation . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Packaging, transport and storage . . . . . . . . . . . . . . .
4.1 General instructions . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Mounting instructions for flow measurement . . . . . . .
4.3 Mounting instructions for level measurement . . . . . . .
4.4 Mounting instructions with differential pressure
measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Mounting for instruments with isolating diaphragms ..
4.6 Mounting instructions for seal with flange mounting . .
4.7 Heat insulation of instruments with flange isolating
diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.8 Mounting instructions for wall or tube mounting . . . . .
4.9 Mounting control . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
4
4
5
5
5
5
6
6
6
6
6
7
8
9
9
11
12
15
20
21
24
24
26
26
5 Connecting to power supply
5.1 Preparing the connection . . . . . . . . . . . . . . . . . . . . .
5.2 Connection procedure . . . . . . . . . . . . . . . . . . . . . . .
5.3 Wiring plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Take 4 … 20 mA test signal . . . . . . . . . . . . . . . . . . .
5.5 Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6 Connection control . . . . . . . . . . . . . . . . . . . . . . . . .
5.7 Switch on phase . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Operation
6.1 Short description . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Local indication (optional) . . . . . . . . . . . . . . . . . . . .
6.3 Adjustment elements . . . . . . . . . . . . . . . . . . . . . . . .
6.4 Local adjustment - local indication not connected . . .
2 VEG
27
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28
30
30
30
31
31731-EN-081119
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37
ADIF 55 • 4 … 20 mA/HART
Contents
6.5 Loca
6.6 Data memory module (optional) . . . . . . . . . . . . . . . .
6.7 Copy configuration data . . . . . . . . . . . . . . . . . . . . . .
6.8 Adjustment via HART handheld . . . . . . . . . . . . . . . .
6.9 Lock/Unlock adjustment . . . . . . . . . . . . . . . . . . . . . .
6.10 Default setting (reset) . . . . . . . . . . . . . . . . . . . . . . .
6.11 Menu schematic . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Set up
7.1 Warning instructions . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Installation and function control . . . . . . . . . . . . . . . . .
7.3 Select language and measuring mode . . . . . . . . . . .
7.4 Position correction . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5 Flow measurement . . . . . . . . . . . . . . . . . . . . . . . . .
7.6 Level measurement . . . . . . . . . . . . . . . . . . . . . . . . .
7.7 Differential pressure measurement . . . . . . . . . . . . . .
8 Maintenance and fault rectification
8.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Remove interferences . . . . . . . . . . . . . . . . . . . . . . .
8.3 Replacement parts . . . . . . . . . . . . . . . . . . . . . . . . .
8.4 Instrument repair . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Dismounting
9.1 Dismounting steps . . . . . . . . . . . . . . . . . . . . . . . . . .
9.2 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 Supplement
10.1 Technical data and dimensions . . . . . . . . . . . . . . . .
l adjustment - local indication connected . . . . . .
40
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48
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52
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31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
Supplementary documentation
tion:
Informa
Supplementary documents appropriate to the ordered version come
with the delivery. You can find them listed in chapter "Product
description".
RT 3
1 Abou
t this document
1 Abou
t this document
1.1 Function
This operating instructions manual provides all the information you
need for mounting, connection and setup as well as important
instructions for maintenance and fault rectification. Please read this
information before putting the instrument into operation and keep this
manual accessible in the immediate vicinity of the device.
1.2 Target group
This operating instructions manual is directed to trained personnel.
The contents of this manual should be made available to these
personnel and put into practice by them.
1.3 Symbolism used
Inform
ation, tip, note
This symbol indicates helpful additional information.
Cauti
on: If this warning is ignored, faults or malfunctions can
result.
Warning: If this warning is ignored, injury to persons and/or serious
damage to the instrument can result.
Danger: If this warning is ignored, serious injury to persons and/or
destruction of the instrument can result.
applications
Ex
This symbol indicates special instructions for Ex applications.
l List
The dot set in front indicates a list with no implied sequence.
à Action
Th
is arrow indicates a single action.
1 Sequence
Numbers set in front indicate successive steps in a procedure.
4 VEG
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
your safety
2 For
or your safety
2 F
2.1 Authorised personnel
All operations described in this operating instructions manual must be
carried out only by trained specialist personnel authorised by the plant
operator.
During work on and with the device the required personal protection
equipment must always be worn.
2.2 Appropriate use
VEGADIF 55 is a differential pressure transmitter for measurement of
flow, level or differential pressure.
You can find detailed information on the application range in chapter
"Product description".
Operational reliability is ensured only if the instrument is properly used
according to the specifications in the operating instructions manual as
well as possible supplementary instructions.
For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by the manufacturer. Arbitrary
conversions or modifications are explicitly forbidden.
2.3 Warning about misuse
Inappropriate or incorrect use of the instrument can give rise to
application-specific hazards, e.g. vessel overfill or damage to system
components through incorrect mounting or adjustment.
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
2.4 General safety instructions
This is a high-tech instrument requiring the strict observance of
standard regulations and guidelines. The user must take note of the
safety instructions in this operating instructions manual, the countryspecific installation standards as well as all prevailing safety
regulations and accident prevention rules.
The instrument must only be operated in a technically flawless and
reliable condition. The operator is responsible for trouble-free
operation of the instrument.
During the entire duration of use, the user is obliged to determine the
compliance of the required occupational safety measures with the
current valid rules and regulations and also take note of new
regulations.
RT 5
2 For
your safety
2.5 Safety
The safety approval markings and safety tips on the device must be
observed.
approval markings and safety tips
2.6 Safety approval markings and safety tips
The safety approval markings and safety tips on the device must be
observed.
2.7 CE conformity
VEGADIF 55 is CE conform to EMVG (89/336/EWG), NSR (73/23/
EWG) and corresponds to NAMUR recommendation EMC (NE 21).
Conformity has been judged according to the following standards:
l EMC: Emission EN 61326 instrument B, susceptibility EN 61326
supplement A (industrial area)
l LVD: EN 61010-1
The instrument corresponds to article 3 (3) of EG directive 97/23/EG
pressure device regulation and is designed according to good
engineering experience. VEGADIF 55 as basic instrument with PN 420
withtout isolating diaphragm is suitable for stable gases of group 1,
category 1.
2.8 Safety instructions for Ex areas
Please note the Ex-specific safety information for installation and
operation in Ex areas. These safety instructions are part of the
operating instructions manual and come with the Ex-approved
instruments.
2.9 Environmental instructions
Protection of the environment is one of our most important duties. That
is why we have introduced an environment management system with
the goal of continuously improving company environmental protection.
The environment management system is certified according to DIN
EN ISO 14001.
Please help us fulfil this obligation by observing the environmental
instructions in this manual:
l Chapter "Packaging, transport and storage"
l Chapter "Disposal"
6 VEG
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
+ –
2
1
3
3 Produc
t description
Scope of delivery
Components
3 Produc
t description
3.1 Configuration
The scope of delivery encompasses:
l VEGADIF 55 differential pressure transmitter
l Version with lateral flanges of 316L or C22.8: in addition 2
ventilation valves, 316L
l Version with lateral flanges of 316L or C22.8 and lateral
ventilations: in addition 4 closing screws, 316L
l Optional accessory
l Documentation
- this operating instructions manual
- Short instruction (in housing cover)
- Final inspection protocol
- Supplementary instructions manual - 31732 "Service instruc-
tions for VEGADIF 55"
- Ex-specific "Safety instructions" (with Ex-versions)
- if necessary, further certificates
VEGADIF 55 consists of the following components:
l Process fitting w ith measuring cell
l Housing with electronics, optionally available with plug connector
l Housing cover, optionally available with local indication
The components are available in different versions.
Type label
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
Fig. 1: VEGADIF 55 in
1 Housing cover, optionally available with subjacent on-site indication
2 Housing with electronics
3 Process fitting with measuring cell
The type label contains the most important data for identification and
use of the instrument:
l Article number
l Serial number
basic version
RT 7
1
2
3
4
5
1
p
2
p
3 Produc
t description
hnical data
l Tec
l Article numbers documentation
With the serial number, you can access the delivery data of the
instrument via "
search". In addition to the type label outside, you can also find the
serial number on the inside of the instrument.
www.vega.com", "VEGA Tools" and "serial number
3.2 Principle of operation
Area of application
Functional principle
VEGADIF 55 is a differential pressure transmitter for measurement of
flow, level or differential pressure. Measured products are gases,
vapours and liquids.
The sensor element is a metallic measuring cell. The process pressure
is transmitted via the separating diaphragm and filling oil to the
resistance measuring bridge (semi-conductor technology). The differential-pressure dependent change of the bridge voltage is measured,
further processed and converted into a corresponding output signal.
The configuration of the measuring cell differs depending on the
measuring range:
Fig. 2: Metal
1 Measuring element
2 Silicone diaphragm
3 Separating diaphragm
4 Filling oil
5 Integrated overvoltage arrester
measuring cell 10 mbar and 30 mbar
8 VEG
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
1
2
3
4
1
p
2
p
3 Produc
t description
Voltage supply
Packaging
Fig. 3: Metal
1 Measuring element
2 Overload diaphragm/Middle diaphragm
3 Filling oil
4 Separating diaphragm
Two-wire electronics 4 … 20 mA/HART for power supply and
measured value transmission over the same cable.
The voltage supply range can differ depending on the instrument
version. The exact range is stated in chapter "Wiring plan " or
"Technical data" in the product information manual "VEGADIF 55".
measuring cell from 100 mbar
3.3 Operation
VEGADIF 55 can be adjusted with different adjustment media:
l via integrated adjustment keys and local indication (available as
options)
l an adjustment software according to FDT/DTM standard, e.g.
PACTware and PC
l with manufacturer-specific adjustment programs AMS™ or PDM
l With a HART handheld
The entered parameters are generally saved in VEGADIF 55,
optionally also in PACTware.
3.4 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
according to DIN EN 24180.
The packaging of standard instruments consists of environmentfriendly, recyclable cardboard. For special versions, PE foam or PE foil
is also used. Dispose of the packaging material via specialised
recycling companies.
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
RT 9
3 Produc
t description
Transport
Transport inspection
Storage
Storage and transport
temperature
sport must be carried out under consideration of the notes on the
Tran
transport packaging. Nonobservance of these instructions can cause
damage to the device.
The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or
concealed defects must be appropriately dealt with.
Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.
Unless otherwise indicated, the packages must be stored only under
the following conditions:
l Not in the open
l Dry and dust free
l Not exposed to corrosive media
l Protected against solar radiation
l Avoiding mechanical shock and vibration
l Storage and transport temperature see chapter "Supplement -
Technical data - Ambient conditions"
l Relative humidity 20 … 85 %
10 VEG
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
max. 380°
4 M
ounting
Materials, wetted parts
Mounting position
4 Moun
ting
4.1 General instructions
Make sure that the wetted parts of VEGADIF 55, especially the seal
and process fitting, are suitable for the existing process conditions
such as pressure, temperature etc. as well as the chemical properties
of the medium.
You find the specification in the "Product information manual"
VEGADIF 55 in chapter "Technical data".
Select such a mounting position that the instrument is in easy reach
when mounting or connecting as well as for later retrofitting of the
indicating and adjustment module. After loosening the pin, the housing
can be rotated by 380°.
Proceed as follows:
1 Loosen the pin with a 2 mm Allen wrench
2 Rotate the housing (max. up to 380°)
3 Tighten the pin
Installation position
Effective pressure lines
Valve block
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
Fig. 4: Direct
Due to the installation position of VEGADIF 55, a zero point shifting
can be caused, i.e. the measured values is not zero with empty vessel.
You can correct this zero point shoft either directly on the instrument
via the "E" key or the remote adjustment, see chapter "Operating
elements" and "Position adjustment".
You find general recommendations for wiring of effective pressure
lines in DIN 19210 "Effective pressure lines for flow systems" or the
corresponding national or international standards. When wiring
effective pressure lines outdoors, keep in mind to use a suitable
antifreeze, e.g. by using tube heat tracing. Wire effective pressure
lines with a monotonic decrease of at least 10 %.
Using a three-fold or five-fold valve block ensures easy setup,
mounting and maintenance without interrupting the process.
RT 11
the housing
+
–
1
2
4
3
ounting
4 M
Oxygen applications
r:
Dange
Instruments for oxygen applications should be unpacked just before
mounting. After removing the protective cover of the process fitting, the
label "O₂" will be visible on the process fitting. Penetration of oil,
grease and dirt should be avoided. Danger of explosion!
Moisture
Flow measurement in
gases
Use the recommended cables (see chapter "Connecting to power
supply") and tighten the cable gland.
You can give your VEGADIF 55 additional protection against moisture
penetration by leading the connection cable downward in front of the
cable entry. Rain and condensation water can thus drain off. This
applies mainly to outdoor mounting as well as installation in areas
where high humidity is expected (e.g. through cleaning processes) or
on cooled or heated vessels.
4.2 Mounting instructions for flow measurement
Fig. 5: Measurement
1 VEGADIF 55
2 Three-fold valve block
3 Block valves
4 Orifice or impact pressure probe
setup, flow measurement in gases with VEGADIF 55
à Mount VEGADIF 55 above the measurement loop so that
12 VEG
condensate can drain off in the process cable.
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
+
–
1
2
3 3
5 5
6 6
7
4
Flow measurement in
vapours
4 M
ounting
Fig. 6: Measurement
1 Condensate vessels
2 Orifice or impact pressure probe
3 Block valves
4 VEGADIF 55
5 Precipitator
6 Drain valves
7 Three-fold valve block
à Mount VEGADIF 55 below the measurement loop
à Mount condensate vessels at the same height with the discharge
socket and at the same distance to VEGADIF 55
à Fill the effective pressure lines to the height of the condensate
vessels before setup
setup, flow measurement in vapours with VEGADIF 55
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
RT 13
+
–
1
2 2
3
5 5
6
4 4
ounting
4 M
Flow measurement in
liquids
Fig. 7: Measurement
1 Orifice or impact pressure probe
2 Block valves
3 VEGADIF 55
4 Precipitator
5 Drain valves
6 Three-fold valve block
à Mount VEGADIF 55 below the measurement loop so that the
effective pressure lines are always filled with liquid and gas
bubbles can bubble up to the process line
à For measurements in products with solid content such as e.g. dirty
liquids, the installation of separators and drain valves is
recommended to enable collection and removal of debris and
sediment.
à Fill the effective pressure lines to the height of the condensate
vessels before setup
setup, flow measurement in liquids with VEGADIF 55
31731-EN-081119
14 VEG
ADIF 55 • 4 … 20 mA/HART
+
p
atm
min.
p
atm
1
2
3
4
5
+
–
min.
p
atm
p
atm
1
2
4 M
ounting
Level measurement in
the open vessel with
effective pressure line
Level measurement in
the open vessel with
flange
4.3 Mount
Fig. 8: Measurement
1 Minus side is open to the atmospheric pressure
2 VEGADIF 55
3 Block valve
4 Precipitator
5 Drain valve
à Mount VEGADIF 55 below the lower measurement connection so
that the effective pressure lines are always filled with liquid
à Minus side is open to the atmospheric pressure
ing instructions for level measurement
setup, level measurement in the open vessel
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
Fig. 9: Measurement
1 VEGADIF 55
2 Minus side is open to the atmospheric pressure
à Mount VEGADIF 55 directly to the vessel
à Minus side is open to the atmospheric pressure
setup, level measurement in the open vessel
RT 15
+
–
min.
max.
1
3
4
3
4
5
1
2
ounting
4 M
Level measurement in
closed vessel with effective pressure line
Fig. 10: Measurement
1 Block valves
2 VEGADIF 55
3 Precipitator
4 Drain valves
5 Three-fold valve block
à Mount VEGADIF 55 below the lower measurement connection so
that the effective pressure lines are always filled with liquid
à Connect minus side always above the max. level
à For measurements in products with solid content such as e.g. dirty
liquids, the installation of separators and drain valves is
recommended to enable collection and removal of debris and
sediment.
setup, level measurement in closed vessel
16 VEG
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
+
–
max.
min.
1
2
3
4
+
–
min.
max.
1
Level measurement in
closed vessel with
flange
4 M
ounting
Level measurement in
closed vessel with cell
isolating diaphragms
Fig. 11: Measurement
1 Block valve
2 Precipitator
3 Drain valve
4 VEGADIF 55
à Mount VEGADIF 55 directly to the vessel
à Connect minus side always above the max. level
à For measurements in products with solid content such as e.g. dirty
liquids, the installation of separators and drain valves is
recommended to enable collection and removal of debris and
sediment.
Fig. 12: Measurement
1 VEGADIF 55
à Mount VEGADIF 55 below the lower isolating diaphragm
à The ambient temperature should be the same for both capillaries
setup, level measurement in closed vessel
setup, level measurement in closed vessel
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
RT 17
+
–
min.
max.
1
2
2
3
4
6
5 5
ounting
4 M
Level measurement in
closed vessel with
steam layer with effective pressure line
tion:
Informa
Level measurement is only ensured between the upper edge of the
lower and the lower edge of the upper pressure transmitter.
Fig. 13: Measurement
1 Condensate vessel
2 Block valves
3 VEGADIF 55
4 Precipitator
5 Drain valves
6 Three-fold valve block
à Mount VEGADIF 55 below the lower measurement connection so
that the effective pressure lines are always filled with liquid
à Connect minus side always above the max. level
à The condensate vessel ensures a constant pressure on the minus
side
à For measurements in products with solid content such as e.g. dirty
liquids, the installation of separators and drain valves is
recommended to enable collection and removal of debris and
sediment.
setup in closed vessel with superimposed steam
18 VEG
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
+
–
min.
max.
1
2
3
4
5
Level measurement in
closed vessel with
superimposed steam
with flange
4 M
ounting
Fig. 14: Measurement
1 Condensate vessel
2 Block valve
3 Precipitator
4 Drain valve
5 VEGADIF 55
à Mount VEGADIF 55 directly to the vessel
à Connect minus side always above the max. level
à The condensate vessel ensures a constant pressure on the minus
side
à For measurements in products with solid content such as e.g. dirty
liquids, the installation of separators and drain valves is
recommended to enable collection and removal of debris and
sediment.
setup in closed vessel with superimposed steam
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
RT 19
+
➃
1
2
33
+
–
1
2
4
5
6
4
5
2
3
4 M
ounting
Differential pressure
measurement in gases
and vapours
Differential pressure
measurement in liquids
4.4 Mount
ing instructions with differential
pressure measurement
Fig. 15: Measurement
vapours with VEGADIF 55
1 VEGADIF 55
2 Three-fold valve block
3 Block valves
4 E.g. filter
à Mount VEGADIF 55 above the measurement loop so that
condensate can drain off in the process cable.
setup, differential pressure measurement in gases and
Fig. 16: Measurement
1 E.g. filter
2 Block valves
3 VEGADIF 55
4 Precipitator
5 Drain valves
6 Three-fold valve block
setup, flow measurement in liquids with VEGADIF 55
20 VEG
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
+
–
1
4
22
3
4 M
ounting
Differential pressure
measurement in gases,
vapours and liquids
à Moun
à For measurements in products with solid content such as e.g. dirty
Fig. 17: Measurement
vapours and liquids with VEGADIF 55
1 Cell isolating diaphragm
2 Capillaries
3 E.g. filter
4 VEGADIF 55
à Mount isolating diaphragm with capillaries on top or laterally on the
à In vacuum applications: Mount VEGADIF 55 below the measure-
à The ambient temperature should be the same for both capillaries
t VEGADIF 55 below the measurement loop so that the
effective pressure lines are always filled with liquid and gas
bubbles can bubble up to the process line
liquids, the installation of separators and drain valves is
recommended to enable collection and removal of debris and
sediment.
setup, differential pressure measurement in gases,
pipeline
ment loop
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
4.5 Mounting for instruments with isolating
diaphragms
Isolating diaphragm
Note these general instructions to the isolating diaphragms:
Note:
isolating diaphragm together with a pressure transmitter forms
l An
a closed, calibrated system which is filled through openings in the
isolating diaphragm and the measuring element of the pressure
transmitter. These openings are sealed and must not be opened!
l Do not clean or touch the isolating diaphragm with hard or sharp
subjects
l Remove the diaphragm protection just before installation
l When using a mounting strap, there must be sufficient strain relief
for the capillaries to avoid bending them (bendingradius ≥ 100 mm)
RT 21
+ –
+
–
≥ 100 mm
4 M
ounting
l Reme
mber that due to the hydrostatic pressure of the liquid
columns in the capillaries, a zero point shift can occur. The zero
point shift can be corrected, see also "Position adjustment".
l Keep the application limits of the isolating diaphragm filling oil in
mind according to the Product Information manual VEGADIF 55,
"Planning instructions isolating diaphragms"
Capillaries
To achieve more precise measuring results and avoid instrument
malfunctions, the capillaries must be mounted as follows:
Note:
l Vibr
ation-free (to avoid additional pressure fluctuations)
l Not close to heating or cooling lines
l Insulate them in cooler or warmer environment
l Lay wire with a bend radius ≥ 100 mm
l With isolating diaphragms on both sides, the ambient temperature
and length of both capillaries should be the same
l Always two identical isolating diaphragms (e.g. diameter, material
etc.) should be used for the minus and plus side (standard
shipment)
Fig. 18: Mounting VEGADIF 55 with
vacuum application: place the pressure transmitter below the lower isolating
diaphragm
22 VEG
isolating diaphragms and capillaries with
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
+ –
+
–
H1
–
+
ounting
4 M
um application
Vacu
In applications under vacuum, we recommend mounting the pressure
transmitter below the lower isolating diaphragm. A vacuum load on the
isolating diaphragm due to the filling oil in the capillaries is thus
avoided.
When mounting the pressure transmitter above the lower isolating
diaphragm, the max. difference in height H1 must not be exceeded
according to the following illustrations. The max. difference in height
depends on the density of the filling oil and the smallest pressure
which can occur on the plus side of teh isolating diaphragm (empty
vessel), see following illustration.
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
Fig. 19: Mounting
above the lower isolating diaphragm
RT 23
0,0
2,0
4,0
6,0
8,0
10,0
12,0
50
100 300 400 500 600 700 800 900 1000
mbar
m
200
2
1
3
4
1 2
4 M
ounting
Fig. 20: Diagram
vacuum applications depending on the pressure on the isolating diaphragm on
the plus side
1 Vegetable oil
2 Silicone oil
3 High temperature oil
4 Inert oil
max. mounting height above the lower isolating diaphragm in
4.6 Mounting instructions for seal with flange
mounting
Fig. 21: Mounting
1 Diaphragm
2 Seal
4.7 Heat insulation of instruments with flange
isolating diaphragm
VEGADIF 55 with unilateral flange isolating diaphragm must only be
isolated up to a certain height. The max. permissible isolating heigth is
marked on the instruments and applies to an isolating material with a
heat conductance ≤ 0.04 W/(m x K) and fa max. permitted ambient
24 VEG
the versions with flange or isolating diaphragm
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
λ 0,04≤
W
m K•
T
A
T
P
4 M
ounting
temperature T
≤ 70 °C (158 °F) and process temperature TP< 350 °C
U
(662 °F). The data were determined under the critical application
"resting air".
Fig. 22: Max. permissible
isolating height
31731-EN-081119
VEGADIF 55 • 4 … 20 mA/HA
RT 25
97,5
135
74
124
106
74
37,5
1
4 M
ounting
4.8 Mount
mounting
Fig. 23: Mounting
ing instructions for wall or tube
strap for wall or tube mounting
Take note of the following when mounting:
l Instruments with capillary lines: Mount capillaries with a bending
radius of ≥ 100 mm
l Slightly grease the mounting screws so that the threaded
connetion remains detachable
l For tube mounting, tighten the nuts on the strap with a torque of at
least 30 Nm
4.9 Mounting control
Check the following after mounting the instrument:
26 VEG
l Did you tighten all screws?
l Housing cover tightened?
l Did you tighten the closing screws and the ventilation valves?
31731-EN-081119
ADIF 55 • 4 … 20 mA/HART
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