G - Physics – 01 – W
Patent
G - Physics
01
W
324/29.6, 324/29
G01W 1/14 (2006.01) G01N 27/04 (2006.01) G01N 27/06 (2006.01) G01W 1/00 (2006.01)
Patent
CA 1119669
ABSTRACT OF THE DISCLOSURE Moisture detection systems are known in which interleaved sets of spaced apart wires are connected to a sensing circuit which is activated when moisture bridges wires in the two sets. It is also known to provide a heater resistor so that the system may detect solid precipitation such as snow. However, in some systems, the sensing head has to be of large size and efficient operation has not been practical over a wide range of freez- ing temperatures. The present invention overcomes these problems by pro- viding a compact sensing head comprising sets of wires encapsulated in epoxy and surrounding a small wire wound heating resistor. The heating resistor melts snow or other solid precipitation and the epoxy is selected to have the same thermal coefficient of expansion as the body member of the head so that there is good heat transfer to the wires and the epoxy does not pull away from the body member of the head. A heat dissipating resistor is connected in series with the resistor in the head at a first predetermined low temperature so that the head is kept warm. At an even lower temperature, a thermostat cuts out the heat dissipating resistor so that there is increased current flow to the heater in the sensor head, enabling it to operate down to a very low temperature.
314381
Bowmier Electric Ltd.
Smart & Biggar
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