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- Platinum Resistance Thermometer
This thermometer consists of a long thin platinum wire wound round a small spool made of silica or mica. It uses the linear variation in the resistance of a platinum wire. The resistance of the wire changes proportionally with its temperature. The higher the temperature the greater its resistance.
The ends of the wire are connected to a resistance measuring device, for example, a Wheatstone Bridge.
The thermometer can measure accurately between -200ºC and 1200ºC. It measures a wide range of temperatures. It is used both for precision measurements of the highest accuracy and for routine industrial work.
If the resistance of the wire at 0ºC is R0, and R100 at 100ºC, the temperature equivalent to Rθ is:
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