What is the use of an RTD?

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. Measuring temperature
  2. Measuring pressure
  3. Measuring humidity
  4. Measuring position

Answer (Detailed Solution Below)

Option 1 : Measuring temperature
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Resistance Temperature Detector (RTD)

  • A Resistance Temperature Detector is an electronic device used to determine the temperature by measuring the resistance of an electrical wire.
  • This wire is referred to as a temperature sensor.
  • For the measurement of temperature with high accuracy, an RTD is used because it has good linear characteristics over a wide range of temperatures.
  • Copper, Nickel, and Platinum are widely used metals for RTDs.
  • RTD has a positive temperature coefficient of resistance.
  • Therefore, the resistance of an RTD increases with an increase in temperature.

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