Patent ID: 6940414

Claim:
A pressure switch, which emits an electrical switching signal as a function of magnitude of a pressure which is supplied thereto, which electrical switching signal assumes a first value when the pressure is less than an adjustable threshold value, and assumes a second value when the pressure is greater than the threshold value, wherein: the pressure (pe) is supplied to a pressure sensor ( 11 ) which emits an electrical output signal (ua 1 ) which is a measure of the pressure (pe); the pressure switch ( 10 , 20 ) is supplied with an electrical input signal (ues) which is a measure of the threshold value (ps); the electrical output signal (ua 1 ) from the pressure sensor ( 11 ) and the electrical input signal (ues) are supplied to a logic circuit ( 12 ; 21 ), which then emits an electrical switching signal (ua 2 ) which assumes one of two values (ua 20 , ua 21 ) as a function of magnitude of difference between the electrical signals (ua 1 , ues) which are supplied thereto; and the logic circuit ( 12 ; 21 ) is supplied with an electrical correction signal (uk 1 ) which shifts the pressure at which a switching process takes place with respect to the threshold value (ps) which is predetermined by the electrical input signal (ues).