Protected pressure sensor and method of making

Details Protected pressure sensor and method of making Protected pressure sensor and method of making

1989-06-05

1991-02-19

Goldberg, Howard N.

Measuring and testing

Fluid pressure gauge

With protective separator

29593, 29856, 73723, 73754, 73756, 361283, G01L 700, H01R 4300

Patent

active

049932659

ABSTRACT:
A solid state measurand sensor is described in which the pressure sensor element is protected from the measurand by a combination of a pressure transfer medium and a thin covering membrane. A method is described for forming the diaphragm in situ. The diaphragm material is selected from a group of materials which includes fluorosilicone, so as to substantially avoid entrapment of air or formation of voids in the pressure transfer medium such as would degrade the performance of the sensor. The pressure transfer medium is gel-like material such as dimethyl silicone and equivalents. Alternatively, the gel may be fluorosilicone and the diaphragm may be dimethyl silicone. The membrane material is chosen to be substantially impermeable to the ambients or process media being measured and also flexible, is to be poured and cured in place on the assembly during fabrication.

REFERENCES:
patent: 4567006 (1986-01-01), Covington et al.
patent: 4655088 (1987-04-01), Adams
patent: 4691573 (1987-09-01), Varnum et al.
patent: 4732042 (1988-03-01), Adams

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