Sensor for detecting deleterious conditions

Details Sensor for detecting deleterious conditions Sensor for detecting deleterious conditions

1980-12-08

1982-04-13

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6183, 340590, G08B 2100, H01H 3775

Patent

active

043250599

ABSTRACT:
A freezer alarm sensor has a body in which there is an elongated vertically extending chamber. Contactors connectable in an alarm energizing circuit, normally insulated from one another, are exposed in the chamber, near one of its ends and diametrically opposite one another. A current conducting slider is freely slidable in the chamber between a raised position spaced from the contactors and a dropped position engaging the contactors and electrically connecting them. The chamber is partially filled with material that is solid at temperatures below a predetermined value and by which the slider is bound to the body and thus held in its raised position, but said material melts at temperatures above that value, releasing the slider to fall to its dropped position. Also disclosed are a heat sensor and a flood sensor embodying principles of the invention.

REFERENCES:
patent: 213536 (1879-03-01), Vander Weyde
patent: 3896278 (1975-07-01), Murawski et al.
patent: 4011552 (1977-03-01), Quirke
patent: 4144532 (1979-03-01), Boyd

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