Thermally responsive electrical control device and monitoring ci

Details Thermally responsive electrical control device and monitoring ci Thermally responsive electrical control device and monitoring ci

1984-01-23

1986-03-18

Frankfort, Charles

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

374179, G01K 700

Patent

active

045764875

ABSTRACT:
A thermally responsive electrical control device is operable for producing a control signal having first and second voltage levels for controlling the operation of a system actuating device for first and second modes of operation. One embodiment of the device includes a multiple bridge circuit for sensing two temperatures and for making multiple control decisions in response to the two temperatures. Another embodiment of the device includes a thermistor and a nonlinear variable resistance element which is matched in a substantially linear relation with the thermistor for compensating for the inherent substantially nonlinear character of the thermistor. Still another embodiment of the device includes a monitoring circuit which is interconnected to a bridge circuit of the device for providing visual indications of sensed temperatures without significantly interrupting the control function of the device.

REFERENCES:
patent: 3609728 (1971-09-01), Quinn
patent: 3636540 (1972-01-01), Harris
patent: 3875424 (1975-04-01), Hopkins
patent: 4068138 (1978-01-01), Miyakawa et al.
patent: 4186315 (1980-01-01), Benton
patent: 4415790 (1983-11-01), Diesch et al.

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