General Electric Company

Paragon Electric Company, Inc.

John J Allard

Alan Joseph Janicek

Merle L Kemp

Peter J Bos

An electric transducer has a casing with a plurality of walls defining a pair of chambers, and one of the walls interposed between the chambers defines a diaphragm for deflection in response to fluid pressure in one of the chambers. A strain gauge disposed on the one wall in the other of the chambers spans the diaphragm for conjoint deflection therewith to establish an output voltage correlative with the diaphragm deflection, and an electronic amplifier in the other chamber is connected in circuit relation with the strain gauge for amplifying the output voltage.

Electronic transducer

A method of assembling an electronic transducer having a dielectric casing member, a strain gauge, a metallic casing member including at least one wall in part defining an integral flexible diaphragm, and an electronic device including a plurality of solid state components. In this method, the strain gauge is bonded to the at least one wall spanning across the diaphragm so as to be at least in part conjointly flexible with the diaphragm. The electronic device is disposed in superposed spaced apart relation and in circuit relation with the strain gauge, and the strain gauge and the electronic device are enclosed between the dielectric casing member and the metallic casing member.

Method of assembling an electronic transducer

A defrost system adapted for use with refrigeration or heat pump systems wherein an evaporator coil defrost cycle is adaptively modified in response to changing environmental conditions. Under normal conditions, a defrost operation is effected at the end of a period of frost accumulation. The period of frost accumulation is adjusted in accordance with deviation of the time required to defrost a coil from a desired defrost time. During the frost accumulation period, the differential between the temperature of the coil and ambient temperature is determined, and the frost accumulation period terminated and a defrost operation initiated if temperature differential exceeds a target differential.

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Morrison, IL, United States of America

John J Allard