Self contained electronic digital thermometer

Details Self contained electronic digital thermometer Self contained electronic digital thermometer

1975-12-23

1977-03-01

Myracle, Jerry W.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01K 300

Patent

active

040096157

ABSTRACT:
A self-contained electronic digital thermometer is in the form of an elongated probe has a temperature transducing thermistor at a front end and an electronic digital display at a rear end. Circuitry housed within the probe converts the voltage across the thermistor to a digital signal for driving the display. The circuitry includes an operational amplifier fed by the thermistor voltage via a pair of selectable input resistors for providing different gains for the amplifier and fed by a voltage source via a different pair of selectable input resistors for providing different biases to the amplifier. The different gains and biases are selected by a switch for enabling readout in either degree Fahrenheit or degrees Centigrade. A differentiator and comparators are also provided to drive a series of lights indicative of whether the temperature is increasing, decreasing or stable.

REFERENCES:
patent: 3350943 (1967-11-01), Smith
patent: 3494196 (1970-02-01), Moussette
patent: 3785207 (1974-01-01), Brzezinski
patent: 3872726 (1975-03-01), Kauffeld et al.
patent: 3880006 (1975-04-01), Poduje
patent: 3905232 (1975-09-01), Knute

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