Frost detector

Details Frost detector Frost detector

1977-11-02

1979-12-04

Wayner, William E.

Refrigeration

Automatic control

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

310324, 310328, 340582, G08B 2100, F25D 2102

Patent

active

041765249

ABSTRACT:
A frost detector comprises a piezoelectric element secured on a metal diaphragm and inside an air-tight space formed by the diaphragm, a base and a bellows which air-tightly and resiliently connects the diaphragm and the base, the base being secured on a fin of a heat exchanger, the piezoelectric element being connected to an oscillation circuit and an oscillation detection circuit; resonance frequency and impedance characteristic of the piezoelectric element being changed by frosting on the outside face of the diaphragm, and the frosting being detected through a change or stopping of the oscillation and resultant output signal by the oscillation detection circuit.

REFERENCES:
patent: 3240054 (1966-03-01), Roth
patent: 3270330 (1966-08-01), Weinberg
patent: 4019072 (1977-04-01), Mifune et al.

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