3.6.3.5
Measuring cell for absolute pressure from the gauge pressure series
①
②
③
Figure 3-11
The inlet pressure (p
diaphragm
changes the resistance of the four piezoresistors (bridge circuit) of the absolute pressure
sensor. The change in the resistance causes a bridge output voltage proportional to the inlet
pressure.
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09
Measuring cell
Process connection
Seal diaphragm
Function chart of measuring cell for absolute pressure
) is transferred to the absolute pressure sensor
e
③
and the fill fluid
④
⑤
⑥
④
, displacing its measuring diaphragm. The displacement
3.6 Functional principle
Filling liquid
Absolute pressure sensor
Inlet pressure
⑤
via the seal
Description
31