Apparatus for sensing variations in the heat exchange properties

Details Apparatus for sensing variations in the heat exchange properties Apparatus for sensing variations in the heat exchange properties

1975-06-09

1976-11-23

Swann, III, Glen R.

Communications: electrical

Systems

Call station

307118, 307310, 340227D, 340228R, G08B 2100

Patent

active

039939839

ABSTRACT:
The apparatus includes two temperature sensitive switching devices having substantially identical electrical characteristics and exhibiting regenerative switching at a power level which is dependent on the temperature sensed by the switching devices. Both switching devices are exposed to the same ambient temperature in a surrounding medium but only one of them is exposed to variations in the heat exchange properties of the surrounding medium. Means are provided for applying D.C. power to both switching devices at a level such as to maintain them below their switching point under preset conditions of the medium. A coupling device is interconnected between the two switching devices for inducing regenerative switching in one of the switching devices in response to unbalance in the heat dissipated by the switching devices due to variations in the heat exchange properties of the surrounding medium from the preset conditions. A monitoring device is connected to both switching devices for indicating that one of the switching devices has switched as an indication that the heat exchange properties of the medium have changed.

REFERENCES:
patent: 3343004 (1967-09-01), Ovshinsky
patent: 3766395 (1973-10-01), Keir
patent: 3781839 (1973-12-01), Bodge
patent: 3878541 (1975-04-01), Dodson
patent: 3882728 (1975-05-01), Wittlinger

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