The thermistor and the RTD are the measuring instruments for temperatures in modern Heating, Ventilating, Air Conditioning and Refrigeration (HVAC/R) systems.
The measurement of resistance of each device enables the ambient temperature of each sensor to be determined.
The major difference between Resistance Thermometer Detectors (RTD)and thermistor is that the RTD is made of metal, whereas is made of a ceramic or polymer.
Differences between the Thermistor and RTD
Resistance temperature detector (RTS)
RTD is used for measuring the change in temperature.
A thermistor is a thermal resistor which resistance changes with the temperature.