891.34.2189
Operating Instructions
Betriebsanleitung
Mode d’emploi
Differential Pressure Transmitter DELTA-trans
Model 891.34.2189
Differenzdruck-Messumformer DELTA-trans
Typ 891.34.2189
Transmetteur de pression différentielle DELTA-trans
Type 891.34.2189
W
GB
D
F
DELTA-trans Model 891.34.2189 with integrated 3½-digit LCD-display
(optional) and compression fitting with ferrule (optional)
Operating Instructions Differential Pressure Transmitter
GB
DELTA-trans Model 891.34.2189 Page 3 - 15
Betriebsanleitung Differenzdruck-Messumformer
D
DELTA-trans Typ 891.34.2189 Seite 17 - 29
Mode d‘emploi Transmetteur de pression différentielle
F
DELTA-trans Type 891.34.2189 Page 31 - 43
2279453 08/2009 GB/D/F
Contents
Contents
1. Safety instructions 4
2. Operating principle 4
3. Installation instructions 5
4. Installation and commissioning 6
5. Measuring arrangements 7
6. Wiring details 7
7. Version with LCD-display (optional extra) 8
8. Technical data 9
9. Service and maintenance 11
10. Special instructions for integrated pressure equalising valve
or 4-way valve manifold
11. Storage 14
12. Troubleshooting 14
13. Maintenance and servicing 15
GB
12
14. Repairs 15
15. Disposal 15
Warning!
This symbol warns you against actions that can cause
injury to people or damage to the instrument.
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WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans 3
1. Safety instructions / 2. Operating principle
1. Safety instructions
GB
The appropriate national safety regulations (i.e. VDE 0100 /
EN 60 079-14 / EN 837-2) must be observed when installing,
commissioning and operating these instruments.
Do not work on the gauge while it is powered
Serious injuries and/or damage can occur should the appropriate regulations
not be observed
Only appropriately qualified personnel should work on these instruments
2. Operating principle
The differential pressure transmitter consists mainly of a mechanical measuring system (1) with an elastic pressure element (2), a Hall-effect sensor (3) with
signal processing board (4) and a case with the connections for the electronics.
A magnet (5), rigidly coupled to the
pressure element, influences the
electromagnetic field of the HALLeffect sensor. The resulting signal is
amplified to a standard output signal
via the signal processing board.
2155079.01
For recalibration, zero and span
can be adjusted by means of easily
accessible potentiometers (6).
Pressure entries are identified by the
symbols; j high pressure and i low
pressure
WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans4
2279453 08/2009 GB/D/F
3. Installation instructions
3. Installation instructions
Installation arrangement
The pressure transmitter should be installed and operated without exposure
to vibration. It is common practise to install the pressure transmitter fitted to
an isolating device to enable replacement while the system is pressurised
and to isolate the transmitter when reading is not required.
Test connector
Local safety codes such as those for pressure or steam vessels may specify
isolating devices to enable on-site testing of the pressure transmitter.
Mounting provisions
If the pressure system or tailpipe is not rigid enough to accept the weight of
the transmitter, or capable of withstanding any vibrations present, the transmitter should be wall-mounted using a suitable bracket.
Effects of temperature
The operating temperature of the pressure transmitter, resulting from the
effects of the pressure medium, ambient temperatures and possible radiated
heat, must not exceed the temperature range the pressure transmitter is
intended for. Suitably shaped tailpipes or syphons with water filling may be
used to separate the pressure transmitter and its isolating device from hot
pressure media.
Overload protection for pressure elements
Should the measuring media be subject to rapid pressure fluctuations or
there is a possibility of pressure surges, these must not be allowed to act
directly on the pressure element. The effect of any pressure surges must
be restricted, for example, by fitting integral restrictor screws (to reduce the
bore in the pressure connection) or by using adjustable snubber devices.
GB
Pressure test connection
The pressure test connection, with a sufficiently large bore (≥ 6 mm diameter), should be arranged, as far as possible, over a shut-off device, in a
position where the accuracy of reading will not be affected by the flow of the
media being measured. The piping between the pressure test connection
and the pressure transmitter should have an inner diameter large enough to
avoid blockages or delays in pressure transmission. It should also not have
any sharp bends. It is recommended that it is laid with a continuous incline
of approx. 1:15.
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WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans 5
Installation instructions / 4. Installation and commissioning
Piping
The piping should be arranged and fitted so that it can withstand the
GB
stresses caused by expansion, vibration and the influence of heat. When
the media is gaseous, a water drain point should be provided at the lowest
point. For liquid pressure media, an air bleed should be provided at the
highest point.
4. Installation and commissioning
Correct sealing of pressure connections should be achieved by means of
suitable sealing rings, sealing washers or WIKA profile seals.
If the pressure transmitter is positioned lower than the pressure test connection, the tailpipe should be thoroughly cleaned prior to fitting the transmitter.
Once the pressure and electrical connections have been made, the transmitters
are ready for immediate use.
No attempt should be made to remove a pressurised transmitter. If the transmitter cannot be otherwise isolated, the pressure system must be fully vented.
Any residual pressure medium contained in the pressure element may be
hazardous or toxic. This should be taken into account when handling and
storing pressure gauges which have been removed.
2279453 08/2009 GB/D/F
6
WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans
5. Measuring arrangements / 6. Wiring details
5. Measuring arrangements
Proven measuring arrangements for various types of media.
The recommended arrangements for particular applications are shown below.
Liquid media Gaseous media
Contents of
tailpipe
Typically
Pressure
instrument
higher than
tapping point
Pressure
instrument
lower than
tapping point
Liquid Liquid with
vapour
Condensate Boiling liquid Liquefied gas Dry air Moist air,
Vapour
only
Gas only Wet gas Liquid gas
Flue gas
condensate
Steam
6. Wiring details
Electrical connection of this pressure transmitter is made by cable and connector. Precise wiring diagrams can be seen in the following drawings.
In addition to the wiring details, output signal and required power supply are
given on the rating plate.
GB
Description of terminal designations used:
UB+ Plus terminal for supply voltage
0 V Minus terminal for supply voltage
S+ Plus terminal for output signal
S- Minus terminal for output signal
Test Test terminal
The instruments must be included within the plant’s equipotential bonding
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WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans 7
6. Wiring details / 7. Version with LCD-display (optional extra)
Terminal assignment
Terminals 1 and 5 are bridged internally within the connector, so that two terminals are available for the 0 V / S - connection.
GB
4 ... 20 mA 2-wire system 0 ... 20 mA 3-wire system
0 V / S-
UB+ / S+
Test -
Test +
mA
Evaluation
(display/recorder)
Power supply
Connector
housing
0 V / S-
UB+
Test +
S+ / Test-
mA
Evaluation
(display/recorder)
Power suppy
Connector
housing
The transmitter can operate using a non-stabilised supply voltage within the
given limits, so long as the voltage available to the transmitter does not fall
below 10 V, or below 14 V for the LCD-display version.
7. Version with LCD-display (optional)
On integrated LCD-displays, for local pressure read-out, the output signal is 2wire 4 ... 20 mA. For the required power supply for the integrated LCD display,
please refer to Chapter 8, Technical Data.
Limitation on zero point and span adjustment:
If an LCD display is integrated, it must be noted that the zero point and span
adjustment is only to be used for resetting the measuring range. Changes to
the measuring range, made using the zero and span adjustment will not be
shown on the display.
1416 324.03
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WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans8
8. Technical data
8. Technical data
Technical data DELTA-trans, Model 891.34.2189
Differential measuring range bar 0 ... 0.16 to 0 ... 25
Working pressure (stat.) max. bar 25
Overload value either side max.
Pressure connections exposed
Pressure media chamber
Press. element comp. spring stainless steel 1.4310 or FD SiCr EN 10 270-2
Press. element separ. diaphr. FPM/FKM fabric back stay (optional NBR)
Links stainless steel 1.4305, FPM/FKM (optional NBR)
Sealing rings FPM/FKM (optional NBR)
Press. equalising valve
(optional)
4-way valve manifold
(optional)
Power supply U
Permissible residual ripple ≤ 0.1 % of span/10 V
Supply voltage effect % ss ≤ 10
Output signal and permissible
max. load R
Effect of load % of span ≤ 0.1
Response time s approx. 1 (optional approx. 50 ms)
Output signal adjustment
Zero point, electrical % of span ± 15
Span, electrical % of span ± 30
Linearity % of span 2.5 (limit point calibration)
(including hysteresis) optional 1.6 (limit point calibration)
Permissible
Medium temperature °C +80 maximum
Ambient temperature °C -10 … +60 (optional LCD-display 0 … 50)
Compensated temp. range °C -10 … +60 (optional LCD-display 0 … 50)
Temperature coefficient in
compensated temp. range
Average TK on zero point ≤ 0.4 % of span/10 K
Average TK on span ≤ 0.4 % of span/10 K
LCD-display (optional)
Voltage load DC V 3.5
Display 3 ½-digit, height 12.7
Ambient temperature °C 0 … 50
Storage temperature °C -10 … +80
Wiring Terminal box (screw terminals up tu 2.5 mm²)
Wiring protection Protected against reverse polarity and overvoltage
EMC (electro-magnetic
compatibility)
Ingress protection IP 54 (optional IP 65) according EN 60 529 / IEC 529
Weight kg approx. 1.3
B
A
bar 25
to medium
exposed to medium
DC V
2 x G ¼ female, bottom, in-line, centre distance 26 mm (optional: other
pressure connections male or female or compression fitting with ferrule for
pipe Ø 6, 8 or 10 mm respectively)
GD-AlSi 12 (Cu) 3.2982, black painted (optional GD-AlSi 12 (Cu) HARD-COAT
surface protection or stainless steel)
stainless steel and FPM/FKM
Cu-alloy or stainless steel, 1x Press. equalising valve, 2 x gauge valve,
1 x valve for purging or air bleeding
10 < UB ≤ 30 (optional LCD-display 14 < UB ≤ 30)
4 … 20 mA, 2-wire system RA ≤ (UB - 10 V) / 0.02 A with RA in Ohm and UB in Volt
0 … 20 mA, 3-wire system RA ≤ (UB - 10 V) / 0.02 A with RA in Ohm and UB in Volt
Interference emission per EN 50 081 - 1 (March 93) and EN 50 081 - 2 (March 94),
Interference immunity per EN 50 082 - 2 (March 95)
GB
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WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans 9
8. Technical data
Approval German Lloyd (optional)
GB
Additional or deviating technical data
Pressure ranges bar 0 ... 0.25 to 0 ... 10
Output signal 4 ... 20 mA, 2-wire or 0 ... 20 mA, 3-wire current limit I < 32 mA
Permissible ambient
temperature
EMC (electro-magnetic
compatibility)
ESD kV ± 8 contact discharge IEC 1000-4-2
Electromagnetic fields V/m 10 80 % AM, 1 kHz, 0.01 ... 1000 MHz IEC 1000-4-3
Burst kV ± 2 coupling clamp IEC 1000-4-4
Conducted HF-disturbance V 3 80 % AM, 1 kHz, 0.01 ... 100 MHz IEC 1000-4-6
Surge kV ± 0.5 symmetrically IEC 1000-4-5
Conducted NF-disturbance Veff 3 0.05 ... 10 kHz IEC 945
Vibration test Fc
2 ... 25 Hz, +/- 1.6 mm % < 2.5 error IEC 68-2-6
25 ... 100 Hz, 4 g % < 2.5 error
°C -10 … +70
Interference emission per EN 50 081-1 (March 93) and
EN 50 081-2 (March 94),
interference immunity per EN 50 082-2 (March 95)
kV ± 1 asymmetrically, R i = 42 Ohm
kV ± 1 symmetrically
kV ± 2 asymmetrically, R i = 42 Ohm, with surge
protection only e.g. model MM-DS/xNFE(L), firm Dehn & Söhne or equivalent
10
2279453 08/2009 GB/D/F
WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans
9. Service and maintenance
9. Service and maintenance
Always open isolating devices gently, as abrupt opening may generate sudden
pressure surges that may damage the transmitter.
The pressure transmitters require no maintenance or servicing and will give very
long service when handled and operated correctly. It may well be necessary
to check and readjust the zero point periodically. This depends on the working
conditions.
To check zero point
In general, the zero point should be checked and adjusted with the instrument in the unpressurised state.
With differential pressure transmitters the zero point should be checked and
adjusted by opening the pressure equalising valve while under a static load.
The plug screw (NP), found on the top of the case, must be unscrewed to
correct the zero point of the pressure transmitter. The zero point potentiometer
can then be readjusted using a small screwdriver:
turning anticlockwise ⇒ reduces the output signal
turning clockwise ⇒ increases the output signal
To check measuring span
Checking and adjusting the measuring span is a little more complex and has
to be carried out when the pressure transmitter is under pressure, up to the
upper limit of the effective range.
A sufficiently-accurate pressure standard is necessary as a reference.
Only when it is necessary to correct the measuring span should the plug
screw (SP) in the top of the case be unscrewed, and the measuring span
potentiometer can then be readjusted using a small screwdriver:
GB
turning anticlockwise ⇒ reduces the output signal
turning clockwise ⇒ increases the output signal
Once this has been done, the zero point must be checked again and, if necessary, the zero point must be readjusted. This procedure should be repeated
until the zero point and span are calibrated.
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WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans 11
9. Service and maintenance / 10. Special instructions ...
Position of potentiometers in the electronics case
GB
SP potentiometer for span
NP potentiometer for zero point
2158991.01
10. Special instructions for integrated pressure equalising valve or
4-way valve manifold
10.1 Integrated pressure equalising valve
For zero point control on working
processes. Offset errors can be adjusted
using the zero point potentiometer (see
Chapter 9. Service and Maintenance)
Principle of operation
When the button is pressed, the
separation between the measuring chambers is released. The pressure
is thus equalised in both chambers, and the differential pressure is zero.
Releasing the button separates the chambers again and the current differential pressure is measured.
12
valve
actuate
Differential pressure drops to zero
WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans
release
Measuring differential
pressure again
2279453 08/2009 GB/D/F
10. Special instructions for integrated pressure equalising valve ...
10.2 Four-way valve manifold
Functions
Shut off j- and i-process line for removing the transmitter from working
processes
Pressure equalisation for zero point control on working processes
Process line air bleeding
10.2.1 Handling instructions
Sequence of operations to start measuring
1. Open pressure equalising valve (middle
valve)
2. Open shut-off valve for the minus media
Gauge valve,
high pressure
j-
side
Pressure equalising valve
chamber (i) left valve
3. Open shut-off valve for the plus media
chamber (j) right valve
4. Close pressure equalising valve
Sequence of operations at the end of the
Gauge valve, low
pressure i-side
Valve for purging
or bleeding air
measuring operation (also for partial shutdown of the system)
1. Open pressure equalising valve
2. Close shut-off valve for the minus media chamber (i)
3. Close shut-off valve for the plus media chamber (j)
Sequence of operations to remove the transmitter during working processes
1. Open pressure equalising valve
2. Close shut-off valve for the minus media chamber (i)
3. Close shut-off valve for the plus media chamber (j)
4. Open valve for purging or air bleeding
GB
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WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans 13
11. Storage / 12. Troubleshooting
11. Storage
GB
Before installation, in order to prevent damage to the transmitters, the following
points should be observed:
The pressure transmitter should remain in its original packing until installation.
After taking out the transmitter (e.g. for tests), reuse the original packaging
material.
The storage temperature should not be less than -20 °C or more than +60 °C.
Transmitters should be protected against dust and humidity.
12. Troubleshooting
Defect Possible reason Remedy
No signal output Failure of power supply or wiring
Steady signal, despite pressure
changes
Steady and excessively high
signal, despite pressure
changes
Full span reading too low Supply voltage too low Adjust supply voltage
Zero signal too low Zero adjustment made incor-
Zero signal too high Zero adjustment made incor-
Non-linear signal output despite
correct zero adjustment
14
WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans
interrupted
Transmitter miswired Check wiring; if necessary
No pressure Check tailpipes
Electronic defect through incor-
rect supply voltage or external
voltage
Pressure entry blocked Check tailpipes and pressure
Electronic defect through incorrect supply voltage or external
voltage
Transmitter failure through
overpressurisation
Electronic defect through incorrect supply voltage or external
voltage
Load impedance too high Consider permissible max. load
Span adjustment made incor-
rectly
rectly
rectly
Transmitter over-pressurised Return transmitter to manufac-
Transmitter over-pressurised Return transmitter to manufac-
Check power supply and wiring;
replace defective components
rectify it
Return transmitter to manufacturer for repair
entry bore, if necessary clean it
carefully
Return transmitter to manufacturer for repair
Return transmitter to manufacturer for repair
Return transmitter to manufacturer for repair
Re-calibrate transmitter
Re-calibrate transmitter
Re-calibrate transmitter
turer for repair
turer for repair
2279453 08/2009 GB/D/F
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