Probe-type read-out thermometer

Details Probe-type read-out thermometer Probe-type read-out thermometer

1978-01-26

1979-01-09

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

340347AD, G01K 700

Patent

active

041332083

ABSTRACT:
A heat sensitive probe has a tip having a semi-conductor unit mounted on good thermal conductng material assembled in a vacuum or by other means to insure good thermal contact with the outside of the probe and hence very quick response time. The semi-conductor is connected to a suitable voltage source and has an output related to ambient temperature. Conversion of the output current to a suitable voltage uses a very stable resistor which generates a compatible voltage charge with temperature acceptable to the indicating unit, which is preferably a digital display. To avoid inaccuracies from temperature variations of the display unit, a highly stable reference voltage source and suitable divider networks constructed of temperature stable resistors of the same material as the aforementioned stable resistor at the current to voltage stage are employed. Since repeatable semi-conductor probes are not presently commercially available, a current regulator trimmed by selection of resistors to standardize the output of one temperature are employed.

REFERENCES:
patent: 3832668 (1974-08-01), Berman
patent: 3834238 (1974-10-01), Mueller

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