Accessories

Transmitters to combine with pressure gauges

Model 891.34
Model 892.34 Ex-Version
WIKA Data Sheet AC 08.02

Applications

 For installation in pressure gauges, measuring ranges from

0 … 2.5 mbar to 0 … 1000 bar
 Transmitter with magnetic field-dependent sensor and
amplifier
 Industry standard signals are available 4 ... 20 mA resp.
0 ... 20 mA
 With mechanical analogue indication

Special Features

 Basic pressure gauge with mechanical analogue indica-

tion, needing no external power
 Transmitter without effect on mechanical analogue
indication
 Combination of transmitters and alarm contacts possible
 Liquid filling case possible
 Optional accessories in accordance with details given in Bourdon tube pressure gauge, Model 632.50
the respective basic pressure gauge data sheets with transmitter Model 891.34

Description

Service intended
WIKA pressure gauges with integrated transmitter Model The standard 4 ... 20 mA current signals in 2-wire system or
89X.34 combine the advantages of on-site mechanical 0 ... 20 mA in 3-wire system are generated by the integrated
indication with the demands for electrical signal transmis- amplifier on the pressure gauge with transmitter, Model
sion for modern measured value registration in industry. 891.34.

Operating principle The intrinsically safe version, Ex-class version Model

Spring-elastic measuring elements in bourdon tube, 892.34, has to be used in explosion hazardous areas.
diaphragm or capsule form are used as pressure pick-ups. The EC-Type Examination Certificate of the DMT (Deutsche
The movement of the measuring element is used on the Montan Technologie GmbH) for intrinsically safe instru-
mechanical side for movement deflection and converted ments in ignition protection Class “Ex II 2G EEx ia IIC T6”
into an electrical output signal on the electrical side by a and “I M2 EEx ia I” is provided for Model 892.34.
magnetic field-dependent sensor (Hall sensor). Due to the standard 4 ... 20 mA output signal these gauges
can be used in all industries.

WIKA Data Sheet AC 08.02 ∙ 05/2008 Page  of 4

Data Sheets showing similar devices:

Electrical Alarm Contacts; Models 8xx; see Data Sheet AC 08.01
 Specifications Model 891.34 and Model 892.34 (Ex-version)
Power supply UB
 For non-Ex-class version DC V 10 < UB ≤ 30
 For Ex-class version see section Ex-class protection
Supply voltage effect % of FS/10 V ≤ 0.1
Permissible residual ripple % ss ≤ 10
 Output signal for non-Ex-class version, Model 891.34:
4 … 20 mA, 2-wire
0 … 20 mA, 3-wire
{0 ... 10 V, 3-wire}
 Permissible max. load RA RA ≤ (UB - 10 V)/0.02 A with RA in Ohm and UB in Volt, however max. 600 Ω Ω
 Output signal for Ex for Ex-class version, Model 892.34:
4 … 20 mA, 2-wire
 Permissible max. load RA for Ex RA ≤ (UB - 12.5 V)/0.02 A with RA in Ohm and UB in Volt, however max. 600 Ω Ω
Effect of load % FS ≤ 0.1
Response time ms approx. 50 (Model 736.51 approx. 1 s, optional 50 ms)
Output signal adjustment
 Zero point, electrical % of span ±5
 Span, electrical % of span ±5
Linearity by accuracy of local readout
 Class 1.6 % of span ± 1.0 (limit point calibration)
 Class 1.0 % of span ± 0.8 (limit point calibration)
Hysteresis by accuracy of local readout:
 Class 1.6 % of span ≤ 0.8
 Class 1.0 % of span ≤ 0.5
Permissible
 Medium temperature 1) °C -25 … +100
 Ambient temperature 1) °C -20 … +60
Compensated temperature range °C -25 … +60
Temperature coefficient in compensated temperature range
 Average TK on zero point % of span/10 K ≤ 0.3
 Average TK on span % of span/10 K ≤ 0.3
Ex-class protection according to EC-Type Examination Certificate DMT 01 ATEX E 021 for Model 892.34
Output signal 4 … 20 mA, 2-wire
Ex-certification Ex II 2G EEx ia IIC T6 and I M2 EEx ia I
Conformity specifications
 Power supply DC V 12.5 … 28
 Short circuit rating mA 100
 Rating mW 1000
 Internal capacitance nF Ci ≤ 24
 Internal inductance mH Li ≤ 0.2
 Medium temperature °C -20 … +60
 Ambient temperature °C -20 … +60
CE-Conformity Interference emission and immunity per EN 61 326
Wiring Terminal box (screw terminal up to 2,5 mm²)
Wiring protection Protected against reverse polarity and overvoltage
Ingress protection IP 65 per EN 60 529 / IEC 529
{ } Items in curved brackets { } are optional for additional price.
1) For maximum values of Ex-class versions: see Ex-class protection

Page  of 4 WIKA Data Sheet AC 08.02 ∙ 05/2008

Dimensions in mm

only with filled version

1592513.01
Equipotential bonding terminal
only on Ex versions

Position of potentiometer
The potentiometers are accessible after unscrewing the screw plugs in the top of the casing.

SP Potentiometer for span

NP Potentiometer for zero point

1592483.01

Connection details
The terminals 1 and 5 are bridged internally in the terminal box providing two terminals for the 0 V / S- connection.

4 … 20 mA 2-wire system 0 … 20 mA 3-wire system

1416324.03

0 V / S- 0 V / S-

UB+ / S+ UB+
Test- Test+

Test+ S+ / Test-

mA

mA Receiving instrument
Terminal box e.g. indicator Terminal box
Receiving instrument
e.g. indicator

Power supply Power supply

Operating Instructions including further information about mounting and commissioning as well as operation and mainte-
nance is enclosed to each shipment of a pressure transmitter with local readout.

WIKA Data Sheet AC 08.02 ∙ 05/2008 Page  of 4

Feasibility of installing transmitters into pressure gauges
The described transmitters will be built in the following
pressure gauges 1). Furthermore in most alarm contacts can
be combined with transmitters (see food notes for limita-
tions).

Pressure gauge Transmitters Transmitters and alarm contacts

Mo- No- Pressure Data sheet Model Transmitter model
del minal connection 891.34 892.34 891.34 892.34
size Alarm contact model (data sheet AC 08.01)
821 831 831
632.50 100 bottom PM 06.03 x x
736.51 100/160 bottom PM 07.08 x x x 2) x x

1) Other feasibility of installing into pressure gauges on request.

2) Inquire feasibility when intended for flammmable gases!

Measuring instruments with integrated tranmitter see “Mechatronical Pressure Measurement” with Models PGT.

Accessories

Power supply unit devices for pressure gauge with Ex-Galvanic Separator for pressure gauge with trans-
Transmitter Model 891.34 under non-Ex-operation mitter Model 892.34 under Ex-operation
For non-Ex-operation the following power supply unit For Ex-operation the following ex-galvanic separator are
devices are available for DC-supply of transmitter Model available for galvanical separation and transfer of power
891.34: supply for transmitter Model 892.34:

Model A-VA-1 Model KFD2-STC4-Ex1

Power Supply Unit, line voltage AC 230 V, output voltage DC Ex-Transmitter Supply Isolator, line voltage: DC 20 ... 32 V,
24 V, max. 70 mA output voltage: max. DC 25.4 V, max. 88.2 mA

Model KFA6-STR-1.24.500 Model SI815-52

Power Supply Unit, line voltage AC 90 ... 253 V, 48 ... 63 Hz, Ex-Galvanic Separator with power supply transfer for 2-wire
output voltage DC 24 V, max. 500 mA system 4 ... 20 mA.
The galvanic separator is usable with power supply or
electronic indicating instrument with integrated power
supply for transmitter. When calculating the permissi-
ble max. load RA a voltage drop of 7.7 V at the galvanic
separator has to be considered.

Ordering information

Pressure gauge model / Nominal size / Scale range / Size and location of connection / Model-no. of Transmitter / Output
signal required

Specifications and dimensions given in this leaflet represent the state of engineering at the time of printing.
Modifications may take place and materials specified may be replaced by others without prior notice.
9029281 05/2008 GB

Page  of 4 WIKA Data Sheet AC 08.02 ∙ 05/2008

WIKA Alexander Wiegand GmbH & 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