General Signal Corporation

Paul B Binder

Paul M Kroninger, Jr

Louis D Di Napoli

A bulkhead feedthrough for capacitive pressure transducers including a feedthrough body portion welded in a cylindrical opening in a pressure receiving body in which the transducer is mounted. The feedthrough body provides a pressure seal for the transducer cavity and carries conducting rods in holes in the body. The rods are insulated from the body and holes are drilled in the end of each rod from the transducer side to receive spring loaded plunger type contacts which are inserted in the holes so that the plunger protrudes to contact the transducer elements. The dimensions of the feedthrough body and the thermal coefficient of expansion are such that the space between the feedthrough body and the pressure receiving body varies with temperature changes so that the resulting volume changes are sufficient to compensate for the changes in volume of the silicone oil in the transducer cavities.

Electrical feedthrough means for pressure transducer

There is provided a multirange, variable capacitance pressure transducer by bonding a diaphragm plate that is conductive between a pair of insulating plates with the diaphragm plate having a plurality of cavities provided on each side so that diaphragm deflection areas of different sizes are defined. The surfaces of the pair of plates in the cavities are covered by a conductive coating so that the coatings form capacitors with the deflection areas. A fluid communication path is provided to each cavity so that the pressure difference to be measured is placed across the deflection area. Electrical connection is made to selective combinations of said capacitors to provide pressure transducers for a number of ranges in one unit.

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North Wales, PA, United States of America

Paul B Binder