Temperature standard

Details Temperature standard Temperature standard

1979-03-09

1981-01-13

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01K 1500

Patent

active

042442079

ABSTRACT:
An improved melting point temperature standard includes a well for receiving a temperature sensor to be calibrated. Surrounding the well is a cell with a crystalline material therein. A thermally conductive spacer contacts the outer cell walls. A thermal barrier contacts the spacer and a second thermally conductive member encircles the barrier. A heating/cooling element contacts the second thermally conductive member to apply heat or to cool it. Thermistors in the second thermally conducive member and the spacer are used by a control circuit to adjust the heat flow into the cell so that the crystalline material melts over a period of 7 to 8 hours making use of the temperature standard possible for many hours.

REFERENCES:
patent: 3713302 (1973-01-01), Reviel
patent: 4079618 (1978-03-01), King
Natl. Bur. Standards Certificate, Standard Reference Material 1968 Gallium, Melting-Point Standard Jun. 1977.
YST Model 60 Gallium Temperature Standard Aug. 1978.
Mangum et al., editors, The Gallium Melting-Point Standard Jun. 1977.

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