Methods and apparatus for temperature sensing

Details Methods and apparatus for temperature sensing Methods and apparatus for temperature sensing

1992-04-13

1994-01-04

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

116106, 169 48, 169 56, 337320, 337332, 337401, 337409, G08B 1704

Patent

active

052764338

ABSTRACT:
A temperature sensor has a flexible nylon tube connected by a fluid-tight coupling to a metal bellows within a metal housing. The interior of the tube and bellows is filled with a pressurized liquid whose critical temperature corresponds to a threshold temperature to be sensed. The pressurized liquid holds the bellows extended, holding an actuating piston back against the action of a spring. When the threshold temperature is reached, the liquid in the tube must boil and ruptures the tube, causing the bellows to collapse and the actuating piston to move. A projecting actuator then mechanically initiates a response such as the closing of a damper in an air-conditioning duct.

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patent: 4381439 (1983-04-01), Miyazawa et al.
patent: 4728940 (1988-03-01), Stoll et al.
patent: 4819250 (1989-04-01), Thevenon

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