Pressure measuring device

Details Pressure measuring device Pressure measuring device

1979-10-25

1981-04-21

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

361283, G01L 912

Patent

active

042625408

ABSTRACT:
A pressure sensor the output of which is substantially immune from errors caused by temperature variation or exteriorly applied forces. An insulating disc with metal foil electrodes on the flat surfaces thereof is disposed in an inner cylinder housing between a pressure measuring diaphragm and a reference electrode plate. A first measurement pressure is applied directly to the opposite side of the diaphragm and a second measurement pressure is applied to the side adjacent the insulating disc via a soft rubber diaphragm and an insulating liquid which fills the space between the soft rubber diaphragm and measuring diaphragm extending through apertures in the inner cylinder and insulating disc. The difference pressure is determined by measuring the capacitance difference between capacitors formed by the reference electrode plate and the metal foil layer adjacent thereto and the measuring diaphragm and the metal foil layer adjacent thereto.

REFERENCES:
patent: 3965746 (1976-06-01), Rabek
patent: 4158311 (1979-06-01), Yasuhara et al.
patent: 4169389 (1979-10-01), Yasuhara et al.

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