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4. Design and function ... 6. Commissioning, operation
Design and operating principle
The differential pressure transmitter has a ceramic differential pressure sensor
with thick film technology, which works according to the principle of a Wheat-
stone bridge. The differential pressure deflects the ceramic diaphragm, thereby
changing the strain gauge signal, which is amplified 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 flex 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 differential 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 flat 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
WIKA operating instructions differential pressure transmitter model 890.09.2190
GB
9
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