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RTD's

Resistance Temperature Detector (RTD)

An RTD has a resistor that changes resistance with temperature and offers better accuracy than thermocouples. RTD’s also have better stability over time. For Industrial Process Heating the RTD sensor is inserted into a tube and looks like a tube-and-wire thermocouple. The RTD usually has 3 lead wires; 2 red and 1 white. This gives it the ability to negate the lead wire resistance and the RTD and offer you extended lead lengths without loss of temperature accuracy.