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WIKA DPGT40 User Manual

Page 11

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GB

WIKA operating instructions differential pressure transmitter, model DPGT40

11

14093267.01 03/2014 GB/D/F/E

4. Design and function

4.1 Description

4. Design and function

Pressures p

1

and p

2

act on the media chambers ⊕ and ⊖, which are separated by

an elastic diaphragm (1).

The differential pressure (Δp = p

1

- p

2

) leads to an axial deflection of the

diaphragm against the measuring range springs (2).

The deflection, which is proportional to the differential pressure, is transmitted to

the movement (4) in the indicating case via a pressure-tight and low friction rocker

arm (3).

A magnet (5), fixed to the rear of the movement, affects the electromagnetic field

of the HALL sensor. The signal that results from this is converted to a standardised

current output signal by the signal conditioning board (6).

Overpressure safety is provided by metal bolsters (7) resting against the elastic

diaphragm.

14077606.01

4.2 Scope of delivery

Cross-check scope of delivery with delivery note.