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THERMISTOR_THERMOMETER

2015-02-28 02:43  
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THERMISTOR_THERMOMETER
Thermistor for desired temperature range is one leg of Wheatstone bridge driving microammeter through transistor to provide direct indication of temperature. Can also be used for control purposes if suitable amplifier and relay are used in place of meter. Thermistor cable can be or-dinary parallel or twisted wires. To calibrate, immerse thermistor in water at various tem-peratures and measure water temperature with conventional high-accuracy thermometer. Cal-ibration graph can then be prepared as guidefor marking meter scale.-F. M. Mims, Transistor Projects, Vol. 1, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 86-93.