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Postby TGTS0907129» Resistance thermometer

Describe resistance thermometer

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Because of the accuracy and ease with which resistance manner in which resistance varies with temperature, it is common to use this variation to indicate changes in temperature. Devices for this purpose are called resistance thermometers. Platinum wire is frequently used in these instruments, because it does not react with chemicals and has a high melting temperature. A coil of fine platinum wire contained in a porcelain tube is placed in the region whose temperature is to be measured. The resistance of coil is measured by a Wheatstone bridge. Often these instruments are made to record temperatures on a chart, and they are also frequently linked with devices to control temperatures at predetermined values. They can be made to measure temperatures with great precision from exceedingly low temperatures to about 1200°C.

By TGTT170912123 on 9/30/2015 12:52:11 AM
TGTS0907129 on 9/30/2015 12:51:02 AM
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