Demand defrost sensor

Details Demand defrost sensor Demand defrost sensor

1981-01-19

1982-09-07

Makay, Albert J.

Refrigeration

Automatic control

By accumulation on freezing surface, e.g., ice

62151, 340580, F25D 2102, G08B 1902

Patent

active

043477097

ABSTRACT:
A demand defrost system in which a high resistive epoxy resin hermetically seals a capacitive sensor plate and a noise immune phase detector detects a phase shift caused by the build up of frost.

REFERENCES:
patent: 2577779 (1951-12-01), Lindberg
patent: 3282065 (1966-11-01), Flanagan
patent: 3408566 (1968-10-01), Norwich
patent: 3882381 (1973-11-01), Gregory

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