Digital thermometer modification for telemetry and analog record

Details Digital thermometer modification for telemetry and analog record Digital thermometer modification for telemetry and analog record

1979-02-09

1980-08-26

Swisher, S. Clement

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73432A, G01K 102, G01K 714

Patent

active

042189160

ABSTRACT:
Add-on circuitry for use with an electronic digital thermometer to provide a variable range analog output for applications such as telemetry and analog recording. An analog output circuit has offset and gain adjustments so that its output range can be adjusted to correspond to the desired range of temperatures to be measured without affecting the basic accuracy of the thermometer indicator readout. A circuit is connected to the thermometer input for adjustably simulating, in turn, a low and a high temperature reading corresponding to the limits of the expected temperature range to be measured. As the low temperature is simulated and read from the thermometer indicator, the offset is adjusted to provide the low level analog output. The high temperature is then simulated and the gain adjusted to yield the desired analog output, preferably near full scale. A relay circuit designed to have a low thermocouple effect is used to selectively couple the simulator circuit to the thermometer input without having to disconnect the thermocouple.

REFERENCES:
patent: 2886776 (1959-05-01), Knudsen
patent: 3060743 (1962-10-01), Mack
patent: 3100397 (1963-08-01), Peltola
patent: 3203223 (1965-08-01), Petrow
patent: 3817104 (1974-06-01), Sapir
patent: 4041382 (1977-08-01), Washburn

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