Apparatus for measuring temperature and a method of producing sa

Details Apparatus for measuring temperature and a method of producing sa Apparatus for measuring temperature and a method of producing sa

1979-06-01

1981-12-01

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73362SC, 338 22R, G01K 722

Patent

active

043029728

ABSTRACT:
Temperature-sensitive instruments and methods for producing them are disclosed. The apparatus disclosed comprises a pair of temperature-sensitive sensors which have at least one electrical property, such as resistance, which varies with temperature, and which are in electrical communication with each other, conductors connected to these sensors so that the temperature-sensitive instrument can be employed to provide a temperature reading by determining that electrical property from the conductors, and where the electrical property of each of the sensors has equal and opposite deviations from predetermined values so that the sum of those deviations approximately equals zero. In a preferred embodiment the sensors are coupled in series.
The method disclosed includes measuring an electrical property of a plurality of these temperature-sensitive sensors, which preferably are thermistors, sorting the sensors in accordance with the measured values of that electrical property, selecting a plurality of the sorted sensors so that the sum of the deviations from predetermined values of the measured values of their respective electrical properties is approximately equal to zero, and assembling those selected sensors into a temperature-sensitive instrument.

REFERENCES:
patent: 3028756 (1962-04-01), Takagishi et al.
patent: 3109227 (1963-11-01), Goodyear
patent: 3110088 (1963-11-01), Blom
patent: 3673538 (1972-06-01), Faxon
patent: 3684996 (1972-08-01), Schwarz
patent: 3750471 (1973-08-01), Bremer
patent: 3889362 (1975-06-01), Tyler

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