Wika 890.09.2190 Uživatelský manuál stáhnout pdf (Strana 9)

WIKA operating instructions dierential pressure transmitter model 890.09.2190 9

11171545.02 08/2010 GB/D/F/E

4. Design and function ... 6. Commissioning, operation

Design and operating principle

The dierential pressure transmitter has a ceramic dierential pressure sensor

with thick lm technology, which works according to the principle of a Wheat-

stone bridge. The dierential pressure deects the ceramic diaphragm, thereby

changing the strain gauge signal, which is amplied to a standard current output

signal by the integrated electronics. The sensor is mounted between the two case

halves and sealed by O-rings. The sensor signal is transmitted, free of interfe-

rence, to the printed circuit board via ex cables. The transmitter is electrically

connected by means of a 3-wire cable which is led to the room for service

connections through a protective tube. The instrument has 2 lugs for mounting.

The dierential pressure transmitter is both factory calibrated and temperature

compensated.

Scope of delivery

Cross-check scope of delivery with delivery note.

5. Transport, packaging and storage

5.1 Transport

Check transmitter for any damage that may have been caused by transport.

Obvious damage must be reported immediately.

5.2 Packaging

Do not remove packaging until just before mounting.

Keep the packaging as it will provide optimum protection during transport (e.g.

change in installation site, sending for repair).

5.3 Storage

Permissible conditions at the place of storage:

 Storage temperature: -20 ... +50 °C

6. Commissioning, operation

Mechanical connection

The transmitter is designed for mounting on at mounting plates. For screwing it to

the mounting plate, the instrument has a mounting bore

Ø 5.5 mm and an elongated hole with a width of 5.5 mm.

The IP 55 ingress protection (front panel) is only guaranteed when the supplied

cable gland, with internal sealing element, and corrugated hose are used. To

ensure this, the M8 connection cable is pre-assembled with the associated corru-

gated hose / cable gland combination, and then mounted into the built-in M8

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Wika 890.09.2190 Uživatelský manuál Strana 9