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● The inlet pressure (p
e
) is transferred to the absolute pressure sensor
⑤
via the seal
diaphragm
③
and the fill fluid
④
, displacing its measuring 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.
4.4.3.4
Measuring cell for absolute pressure, front-flush membrane
S
H
①
Measuring cell
④
Filling liquid
②
Process connection
⑤
Absolute pressure sensor
③
Seal diaphragm
p
e
Inlet pressure
Figure 4-10
Function chart of the measuring cell for absolute pressure, flush mounted diaphragm
● The inlet pressure (p
e
) is transferred to the absolute pressure sensor
⑤
via the seal
diaphragm
③
and the filling liquid
④
, and displaces its measuring 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.
Description
4.4 Functional principle
SITRANS P320/P420 (mA/HART)
Operating Instructions, 06/2018, A5E44852162-AA
33
Содержание SITRANS P320
Страница 10: ...Table of contents SITRANS P320 P420 mA HART 10 Operating Instructions 06 2018 A5E44852162 AA ...
Страница 18: ...Introduction 2 7 Notes on warranty SITRANS P320 P420 mA HART 18 Operating Instructions 06 2018 A5E44852162 AA ...
Страница 174: ...Functional Safety 10 7 Repair and service SITRANS P320 P420 mA HART 174 Operating Instructions 06 2018 A5E44852162 AA ...
Страница 260: ...Index SITRANS P320 P420 mA HART 260 Operating Instructions 06 2018 A5E44852162 AA ...