Measuring Cell For Absolute Pressure, Front-Flush Membrane - Siemens SITRANS P Operating Instructions Manual

● The inlet pressure (p
diaphragm
● The displacement 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.
4.4.2.4

Measuring cell for absolute pressure, front-flush membrane

①
②
③
Figure 4-10
● The inlet pressure (p
diaphragm
● The displacement 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 P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC
) is transferred to the absolute pressure sensor
e
③
and the fill fluid
Measuring cell
Process connection
Seal diaphragm
Function chart of the measuring cell for absolute pressure, flush mounted diaphragm
) is transferred to the absolute pressure sensor
e
③
and the filling liquid
④
, displacing its measuring diaphragm.
④
Filling liquid
⑤
Absolute pressure sensor
p Inlet pressure
e
④
, and displaces its measuring diaphragm.
Description
4.4 Functional principle
⑤
via the seal
⑤
via the seal
35