Description
3.6 Principle of operation
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
33
Measuring cell for absolute pressure from the gauge pressure series
Figure 3-11 Function chart of measuring cell for absolute pressure
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.
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