Differential pressure transducer
AssigneeHaenni Instruments AG
InventorsBertrand Dutoit, Andreas Friedrich, Kurt Hug, Radivojc Popovic
Life of this patent
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Abstract
A differential pressure transducer has a measurement chamber which is divided by a membrane into first and second measurement spaces which can be exposed to first and second pressures whereby differential pressure causes deflection of the membrane from its neutral position. A deflection sensor measures the deflection of the membrane and produces a deflection signal. An electromagnet arrangement produces a magnetic force which compensates for the deflection force which is caused by the differential pressure. The coil current for producing the magnetic compensation force represents a measure of the differential pressure.
Claims26
A differential pressure transducer comprising
- a 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.
A differential pressure transducer comprising
- a chamber;
- said chamber comprising first and second measurement spaces that are exposed to first and second pressures;
- a measurement membrane;
- said measurement membrane being deflected in response to a pressure differential between said first and second pressures;
- a sensor and compensating device for producing a deflection signal responsive to said deflection and for compensating for the deflection said sensor and compensating device comprising a same electromagnetic device and a same magnetic means,
- wherein the same electromagnetic device is simultaneously a part of both of the sensor and compensating device and the same magnetic means is simultaneously a part of both of the sensor and compensating device.
Dependencies are inferred from the claim text.