Measuring Cell For Gauge Pressure - Siemens SITRANS P DS III Operating Instructions Manual

● Flange connection in accordance with EN 61518
● Flush-mounted process connections
3.6.3.1

Measuring cell for gauge pressure

①
②
③
④
Figure 3-7
The inlet pressure (p
④
resistance of the four piezoresistors (bridge circuit) of the gauge pressure sensor. The
change in the resistance causes a bridge output voltage proportional to the inlet pressure.
Transmitters with measuring span ≤ 63 bar measure the inlet pressure against atmosphere,
those with measuring spans ≥ 160 bar against vacuum.
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
Reference pressure opening
Measuring cell
Process connection
Seal diaphragm
Function chart of measuring cell for gauge pressure
) is transferred to the gauge pressure sensor
e
⑤
and the fill fluid , displacing its measuring diaphragm. The displacement changes the
3.6 Principle of operation
⑤
Filling liquid
⑥
Gauge pressure sensor
p Inlet pressure
e
⑥
via the seal diaphragm
Description
29