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Clinical Chemistry 24: 1331-1334, 1978;
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Clinical Chemistry, Vol 24, 1331-1334, Copyright © 1978 by American Association for Clinical Chemistry

A melting-point-of gallium apparatus for thermometer calibration

HE Sostman and KA Manley

We have investigated the equilibrium melting point of gallium as a temperature fixed-point at which to calibrate small thermistor thermometers, such as those used to measure temperature in enzyme reaction analysis and other temperature-dependent biological assays. We have determined that the melting temperature of "6N" (99.999% pure) gallium is 29.770 +/- 0.002 degrees C, and that the constant- temperature plateau can be prolonged for several hours. We have designed a simple automated apparatus that exploits this phenomenon and that permits routine calibration verification of thermistor temperature probes throughout the laboratory day. We describe the physics of the gallium melt, and the design and use of the apparatus.




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Copyright © 1978 by the American Association for Clinical Chemistry.