Frost detector

Details Frost detector Frost detector

1976-03-01

1977-09-06

Wayner, William E.

Refrigeration

Automatic control

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

73 17A, 340234, F25D 2102

Patent

active

040459713

ABSTRACT:
A frost sensor for detecting the presence of frost in a refrigeration device includes a light impervious enclosure having an air passage through it. Means preferably are provided for directing ambient air through the air passage. The air passage has thermal conducting means mounted in it, the thermal conducting means having a first surface forming a portion of the air passage. A connection device also is provided for attaching the conducting means to the refrigeration device. A photocell and a light source are mounted so that the photocell senses reflectivity of the conductive means. The volume of ambient air passing through the air passage and the thermal resistance between the conducting means and the refrigeration device may be varied so that the formation of frost on the conducting means can be made to agree with the formation of frost on the refrigeration device.

REFERENCES:
patent: 2297370 (1942-08-01), Siedle
patent: 2355014 (1944-08-01), Schorn
patent: 2377926 (1945-06-01), Dreier
patent: 2466696 (1944-04-01), Friswold et al.
patent: 3066496 (1962-12-01), Jokela
patent: 3120108 (1964-02-01), Pansing
patent: 3188828 (1965-06-01), Wayne
patent: 3362183 (1968-01-01), Sutton
patent: 3822560 (1974-07-01), Hansen et al.
patent: 3946286 (1976-03-01), Kinnunen et al.
patent: 3961495 (1976-06-01), Beauvent et al.

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