Patent ID: 6925884

Claim:
Differential pressure sensor comprising a first ceramic body ( 20 a ) with a first membrane bed ( 22 a ), a second ceramic body ( 20 b ) with a second membrane bed ( 22 b ), a membrane ( 30 ), which is arranged between the two bodies ( 20 a , 20 b ) and separates the two oppositely situated membrane beds ( 22 a , 22 b ) from one another, a first measurement capacitor K 1 for producing a first measurement signal S 1 with a first electrode pair ( 40 a , 40 b ), which is present as one electrode on the membrane bed ( 22 a ) and one electrode on the membrane ( 30 ), a second measurement capacitor K 2 for producing a second measurement signal S 2 with a second electrode pair ( 41 a , 41 b ), which is present as one electrode on the membrane bed ( 22 b ) and one electrode on the membrane ( 30 ), an electronic circuit which determines from the two measurement signals S 1 and S 2 the capacitances CK 1 , CK 2 of the two measurement capacitors K 1 , K 2 , which produces a signal SIG 1 =1/CK 1 −1/CK 2 , which is essentially proportional to the value of the pressure difference DP and which depends on the nominal pressure NP, which produces a signal SIG 2 =1/CK 1 +1/CK 2 , which is proportional to the value of the nominal pressure NP, wherein the dependence of the measurement value DP on the nominal pressure NP is corrected with the help of the signal SIG 2 .