Mechatronic
Pressure Measurement
Differential Pressure Transmitter
Model 891.34.2189
WIKA Data Sheet PV 17.18
Applications
Suitable for all gaseous and liquid media that will not
obstruct the pressure system
Heating, climatic, ventilating, dust removing technoclogy
Technical building equipment, filter plants,
drinking and service water treatment
Monitoring and control of pumps in pressure boosting
and fire exstinguishing plants
Special Features
Differential pressure measuring ranges from
0 ... 160 mbar
High working pressure (static pressure) up to 25 bar
Overpressure safety either side up to 25 bar
Solid case construction for protection against external
mechanical effects DELTA-trans with integrated 3½-digit LCD-display and
Integrated pressure equalising valve (option) compression fitting with ferrule (option)
Description
The differential pressure transmitters DELTA-trans are parti- As an option, the differential pressure transmitter DELTA-
cularly intended for the measurementof very low differential trans (in 2-wire design; 4 ... 20 mA) may be supplied with an
pressures with high demands on one-sided overload. integrated 3½-digit LCD-display.
Standard output signals of 4 … 20 mA (2-wire system) or Electrical connection is made by means of a cable box with
0 … 20 mA (3-wire system) can be provided from a non- cable gland M20 x 1.5.
stabilised DC supply of 10 … 30 V.
Due to the solid and compact design of the instrument,
the operation requires almost no maintenance even under
arduous industrial service conditions.
WIKA Data Sheet PV 17.18 ∙ 12/2009 Page 1 of 4
Data sheets showing similar devices:
DELTA-plus, Differential pressure gauges with integrated working pressure gauges; Model 702.01.100; see data sheet PM 07.15
DELTA-switch, Differential pressure switches; Model 851.02.100; see data sheet PV 27.17
DELTA-comb, Differential pressure gauges with alarm contacts, and micro switch; Model 702.02.100; see data sheet PV 27.16
Specifications DELTA-trans Model 891.34.2189
Differential pressure range bar 0 ... 0.16 to 0 ... 25
Max. working pressure (stat.) bar 25
Overpressure safety bar Either side max. 25
Process connections (wetted) 2x G ¼ female, lower mount (LM), in-line, axle base 26 mm
(option: other pressure connections male or female or
conpression fitting with ferrule for pipe Ø 6, 8 or 10 mm respectively)
Media chamber (wetted) GD-AISi 12 (Cu) 3.2982, black lacquered
(option GD-AlSi 12 (Cu) HART-COAT-surface protection or stainless steel)
Press. element compress. spring (wetted) Stainless steel 1.4310 or FD SiCr EN 10270-2
Press. element separ. diaphragm (wetted) FPM/FKM fabric back stay (option: NBR)
Links (wetted) Stainless steel 1.4305, FPM/FKM (option: NBR)
Sealings (wetted) FPM/FKM (option: NBR)
Press. equalising valve (option) (wetted) Stainless steel and FPM/FKM
4-way valve manifold (option) (wetted) Cu-alloy or stainless steel, 1x pressure equalising valve, 2x gauge valve,
1x valve for purging or air bleeding
Power supply UB DC V 10 < UB ≤ 30 (option: LCD-display 14 < UB ≤ 30)
Permissible residual ripple % of span / 10 V ≤ 0.1
Supply voltage effect % ss ≤ 10
Output signal and 4 … 20 mA, 2-wire system RA ≤ (UB - 10 V) / 0.02 A with RA in Ohm and UB in Volt
permissible max. load RA 0 … 20 mA, 3-wire system RA ≤ (UB - 10 V) / 0.02 A with RA in Ohm and UB in Volt
Effect of load % of span ≤ 0.1
Response time s Approx. 1 (approx. 50 ms option)
Output signal adjustment
Zero point, electrical % of span ±15
Span, electrical % of span ±30
Linearity % of span 2.5 (limit point calibration)
(including hysteresis) Option: 1.6 (limit point calibration)
Permissible
Medium temperature °C +80 max.
Ambient temperature °C -10 … +60 (option LCD-display 0 … +50)
Compensated temperat. range °C -10 … +60 (option LCD-display 0 … +50)
Temperature coefficients in
compensated temperat. range
average TK of zero point % of span / 10 K ≤ 0.4
average TK of span % of span / 10 K ≤ 0.4
LCD-display (option) Only with electrical output signal 4 ... 20 mA, 2-wire system
Voltage load DC V 3.5
Display 3½-digit, height 12.7 mm
Ambient temperature °C 0 … +50
Storage temperature °C -10 … +80
Wiring Terminal box ( screw terminals up to 2.5 mm2)
Wiring protection Protected against reserve polarity and overvoltage
EMC (electromagnetic Interference emission per EN 50 081 - 1 (March 93) and EN 50 081 - 2 (March 94),
compatibility) Interference immunity per EN 50 082 - 2 (March 95)
Ingress protection IP 54 per EN 60 529 / IEC 529 (option: IP 65)
Weight kg Approx. 1.3
Dimensions mm See drawings
Page of 4 WIKA Data Sheet PV 17.18 ∙ 12/2009
Approval German Lloyd (option)
Additional or deviating specifications
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 temperatur °C -10 ... +70
EMC (electromagnetic Interference emission per EN 50 081 - 1 (March 93) and EN 50 081 - 2 (March 94),
compatibility) Interference immunity per EN 50 082 - 2 (March 95)
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 ... 1000 MHz IEC 1000-4-6
Surge kV ±0.5 symmetrically IEC 1000-4-5
kV ±1 asymmetrically, Ri= 42 Ohm
kV ±1 symmetrically
kV ±2 asymmetrically, Ri= 42 Ohm, with surge protection only
e.g. MM-DS/x-NFE(L), firm Dehn & Söhne, or equivalent
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
Design and operating principle Illustration of operating principle
The differential pressure transmitter consists mainly of a
mechanical measuring system (1) with elastic pressure
element (2), magnetic-field-dependent sensor (3) with signal
processing board (4) and case with the connecting parts for
the electronics.
A magnet (5) rigidly coupled to the pressure element influ-
ences the electromagnetic field of the HALL sensor. The
resulting signal is amplified to a standard output signal via
2155079.01
the signal processing board.
For recalibration, zero and span can be adjusted by means
of easily accessable potentiometers (6).1)
1) Restriction: If an LCD display is integrated, it must be noted that the zero point and
span adjustment is to be used only for recalibration of the measuring range. Changes
Pressure entries identified, of the measuring range made by the user by means of the zero and span adjustment
will not be taken into account by the display. If zero / span adjustments are to be
j high pressure, i low pressure applied during use, we recommend a display 0 ... 100 %.
Position of the potentiometer Connection details
The potentiometers are accessible The terminal 1 and 5 are briged internally in the
after unscrewing the screw plugs terminal box providing two terminals for the
in the top of the casing. 0 V / S - connection.
4 ... 20 mA 2-wire system 0 ... 20 mA 3-wire system
0V/S- 0V/S-
UB+/ S + U B+
Test - Test +
Test + S + / Test -
mA
Terminal box Receiving
mA instrument Terminal
Receiving instrument (e.g. indicator) box
2158991.01
1416324.03
(e.g. indicator)
SP Potentiometer for span
NP Potentiometer for zero point
Power supply Power supply
WIKA Data Sheet PV 17.18 ∙ 12/2009 Page 3 of 4
Dimensions in mm
Standard version Option LCD-display
2156921.03
Option Option Integrated Option
Panel mounting pressure equalising valve 4-way valve manifold
Pressure
equalising
valve
Valve for
purging
or air
bleeding
Panel cut-out
Gauge valve, Gauge valve,
high pressure low pressure
side j side i
2157322.02
2261804.01
2261821.04
Panel
Ordering information
Model / Measuring range / Output signal / Process connection / Material of media chamber / Material of seperation
diaphragm and sealings / Options
Modifications may take place and materials specified may be replaced by others without prior notice.
Specifications and dimensions given in this leaflet represent the state of engineering at the time of printing.
Page 4 of 4 WIKA Data Sheet PV 17.18 ∙ 12/2009
12/2009 GB
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. (+49) 9372/132-0
Fax (+49) 9372/132-406
E-mail info@wika.de
www.wika.de
