WIKA 891.34.1998 892.34.1998

高靜壓不銹鋼防爆兩線差壓變送器

Differential Pressure Transmitter,

Stainless Steel,
Pressure Rating PN 2.5/25/40 bar
     Standard Model 891.34.1998, Ex-Version

  Model 892.34.1998

WIKA 891.34.1998 892.34.1998 高靜壓不銹鋼防爆兩線差壓變送器

     Applications
      For corrosive gaseous and liquid media, provided they are not highly viscous or crystallising, and also for corrosive environments Monitoring and control of pumps Filter monitoring
       Level measurement in closed tanks
      Special Features
       Pressure ranges from 0 ... 6 mbar to 0 … 25 bar
       High working pressure （static pressure） up to 40 bar
       High overpressure safety up to 40 bar
       Industrial standard signals 4 ... 20 mA or 0 ... 20 mA
       Approval: German Lloyd, No. 99180-96HH

      General features
       The principle features of these differential pressure transmitter are their highly corrosion-resistant stainless steel design and their all welded sealing of the pressure chamber providing for an increased tightness in the long term （no
elastomer sealing rings）.
       The differential pressure transmitter consists mainly of a mechanical measuring system of model 732.51 with elastic pressure element, magnetic-field-dependent sensor （Hall sensor） with amplifier and case with the connecting parts
for the electronics. A permanent magnet rigidly coupled to the pressure element influences the flow field of a sensor.
       The resulting differential voltage is amplified to a standard
current signal.

       Standard output signals of 4 ... 20 mA （2 wire system） or 0 ... 20 mA （3 wire system） can be provided from a nonstabilized DC supply of 10 ... 30 V.
       Upon request, the transmitters may also be supplied in intrinsically safe Ex-approved design with the output signal 4 ... 20 mA.
       For recalibration, zero and span can be adjusted by means
of easily accessible potentiometers.
       The use of high-quality stainless steel material is intended for applications within the chemical industry for gaseous, liquid and aggressive media. Typical applications are, for example, the monitoring of pumps, filters and compressors.
       As an optional extra, the design of the pressure transmitter can also be modified to allow for a higher max. total overpressure and higher overload values.
       Electrical connection is made by means of a cable box with screwed cable gland M20 x 1.5.

      Power supply devices for Differential Pressure Transmitter,
      Model 891.34.1998 under non-Ex-operation
      For non-Ex-operation the following power supply devices are available for DC- supply of transmitter model 891.34.1998:
      Model A-VA-1 （old model 903.30.400） - Power supply, line voltage AC 230 V, output voltage DC 24 V, 70 mA max.
      Model KFA6-STR-1.24.500 - Power supply, line voltage AC 90 ... 253 V, 48 ... 63 Hz, output voltage DC 24 V, 500 mA max. Ex-Line transformer for Differential Pressure Transmitter,
      Model 892.34.1998 under Ex-operation
For Ex-operation the following Ex-line transformers are available for galvanical separation and transfer of power supply for transmitter model 892.34.1998:
      Model KFD2-STC4-Ex1, Ex-line transformer, line voltage: DC 20 ... 32 V, output voltage: DC 25.4 V max., 88.2 mA max.
      Model SI 815-52, Ex-line transformer with power supply transfer for 2-wire system 4 ... 20 mA. The line transformer is
usable with power supply or electronic indicating instrument with integrated power supply for transmitter. When calculating
the permissible max. load RA a voltage drop of 7.7 V at the line transformer has to be considered.

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

  
   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
?

  Surface or pipe mounting bracket （option）

  
  For wall mounting
   1. Screw the console to the wall using the fastening bores （A） by means of
2-4 screws （depending on the respective mounting situation）.
The fastening material is not part of the scope of delivery.
   2. Screw the pressure gauge to the fastening thread （B） or （C） of the con
sole by means of the screws and distance bushes enclosed.

?Approval German Lloyd

  Ordering information
  Model / Pressure range / Working pressure max. （static pressure rating） ... bar / Connecting size and connection location
  Output signal / Options

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