G - Physics – 01 – K
Patent
G - Physics
01
K
340/159
G01K 7/24 (2006.01) G01F 1/56 (2006.01) G01F 23/24 (2006.01)
Patent
CA 1036690
ABSTRACT OF THE DISCLOSURE: An apparatus for sensing variations in the heat exchange properties of a medium is disclosed. 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 sur- rounding 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 swit- ching devices due to variations in the heat exchange properties of the sur- rounding medium from the preset conditions. A monitoring device is connected to both switching devices for indicating which one of the switching devices has switched as an indication that the heat exchange properties of the medium have changed.
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