Temperature sensing probe for microwave ovens

Details Temperature sensing probe for microwave ovens Temperature sensing probe for microwave ovens

G - Physics

01

K

340/159, 73/73

G01K 7/16 (2006.01)

Patent

CA 1158064

RD 11409 ABSTRACT OF THE DISCLOSURE A high-impedance four-wire temperature-sensing system for a microwave oven is comprised of a thermistor or other sensor and four leads, such that a constant current is provided to the sensor via two leads and the voltage across the sensor is read via the other two leads. The sensor and the leads have microwave surface resistivity much higher than impedance levels in microwave ovens, so that negligible microwave energy is coupled to the sensing system. The high-resistance leads in a rigid probe to be inserted into food and in a flexible cable are electrically- conductive iron oxide magnetic tape or are deposited conductors.

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