Industrial RTDs for precise measurements are usually made from __

Industrial RTDs for precise measurements are usually made from __
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Industrial RTDs for precise measurements are usually made from _____.

A. Silver

B. Platinum

C. Aluminium

D. Steel

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

Explanation: 

Resistance Temperature Detector (RTD)

  • A Resistance Temperature Detector (RTD) used to change in electrical resistance of a metallic conductor to determine the temperature.
  • Platinum is the best metal for RTD due to its linear resistance-temperature relationship, over a wide range (−272.5° C to 961.78° C) for precise measurement.
  • The resistance increases as the temperature of the sensor increases.
  • An RTD is a passive device.
  • It does not produce an output on its own.
  • External electronic devices are used to measure the resistance of the sensor by passing a small electrical current through the sensor to generate a voltage.
  • Typically 1 mA or less measuring current, 5 mA maximum without the risk of self-heating.

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