Patent ID: 6484586
Filing Date: 2002-11-26
Classification: G01L

Abstract:
A differential pressure transducer comprisinga housing defining a chamber; said chamber comprising first and second measurement spaces that are exposed to first and second pressures; a measurement membrane; a first pressure pick-up membrane exposed to the first pressure, said first pick-up membrane being coupled to the measurement membrane by a solid coupling part to transfer force to said measurement membrane, the effective surface of the first pressure pickup membrane being different from the effective surface of the measurement membrane; said measurement membrane being deflected in response to a pressure differential between said first and second pressures; a deflection sensor producing a deflection signal responsive to said deflection; an electrical switching device generating a current responsive to the deflection signal; said transducer including an electromagnet device and magnetic means; one of said electromagnet device and said magnetic means being mounted on said housing and the other of said electromagnet device and said magnetic means being mounted on said measurement membrane; said current generating in said electromagnet device a magnetic field that exerts a non-contact magnetic force on said magnetic means and said measurement membrane which compensates for the deflection force resulting from the pressure differential; said current representing a measure of the differential pressure; and a measure of said current being output as an indication of the pressure differential.