WIKA 891.34.2189 User Manual
Page 4
GB
1. Safety instructions / 2. Operating principle
2155079.01
2279453 08/2009 GB/D/F
WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans
4
1. Safety instructions
The appropriate national safety regulations (i.e. VDE 0100 /
EN 60 079-14 / EN 837-2) must be observed when installing,
commissioning and operating these instruments.
Do not work on the gauge while it is powered
Serious injuries and/or damage can occur should the appropriate regulations
not be observed
Only appropriately qualified personnel should work on these instruments
2. Operating principle
The differential pressure transmitter consists mainly of a mechanical measu-
ring system (1) with an elastic pressure element (2), a Hall-effect sensor (3) with
signal processing board (4) and a case with the connections for the electronics.
A magnet (5), rigidly coupled to the
pressure element, influences the
electromagnetic field of the HALL-
effect sensor. The resulting signal is
amplified to a standard output signal
via the signal processing board.
For recalibration, zero and span
can be adjusted by means of easily
accessible potentiometers (6).
Pressure entries are identified by the
symbols; j high pressure and i low
pressure