G - Physics – 01 – K
Patent
G - Physics
01
K
G01K 7/22 (2006.01) G05B 9/02 (2006.01) G05D 23/24 (2006.01)
Patent
CA 2127510
A sensor probe and sensor detection circuit used in an electronic temperature control circuit for preventing the control circuit from driving an external device such as a heater when the sensor probe has been disconnected from the control circuit. The sensor probe includes an NTC thermistor and a limiting resistor that are connected in parallel and potted in epoxy. The thermistor and limiting resistor of the sensor probe form part of a lower leg of a voltage divider in the control circuit. The sensor detection circuit compares the voltage signal generated by the sensor voltage divider to a predetermined threshold or ceiling voltage value. During normal operation, when the sensor probe is attached to the control circuit, the resistance of the sensor probe insures that the voltage signal from the sensor voltage divider remains within a predetermined voltage range and does not exceed the predetermined ceiling voltage value. When the sensor probe is disconnected from the control circuit, the resistance of the sensor voltage divider is decreased and the voltage signal exceeds the ceiling voltage value. When the voltage signal exceeds the ceiling voltage value, the sensor detection circuit interrupts the normal operation of the control circuit and shuts down the heater.
Borden Ladner Gervais Llp
Jones Thaddeus M.
LandOfFree
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