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Anonymous
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Asked: 2020-01-23T21:41:52+00:00 In:

RTD VS Thermistor: what is the difference?

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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.

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    1. Level 2
      This answer was edited.

      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.

      • The materials used to make RTD include platinum, nickel and copper.
      • RTD is less accurate.
      • The response time of RTD is very slow.
      • Its temperature range lies between -230°C to 660°C.
      • The sensitivity is low, but the size of the RTD is large.
      • The resistivity is high while the hysteresis effects are low.
      • They have wide applications in industries for measuring large temperature.

      Thermistor

      A thermistor is a thermal resistor which resistance changes with the temperature.

      • The thermistor is made from materials of ceramic or polymer.
      • Thermistors have high accuracy compared to RTD. Due to the negative temperature coefficient, it can detect even small temperature changes.
      • The response time of thermistor is high.
      • Its temperature range lies between -60°C to 15°C.
      • The sensitivity is high, but the size of a thermistor is small as compare to RTD.
      • The resistivity is low while the hysteresis effects are high.
      • They are widely used for measuring the temperature of home appliances.
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