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Instrumentation & Process Control
Measurement Instruments
GATE 2012
Medium

A thermocouple having a linear relationship between 0°C and 350°C shows an emf of zero and 30.5 mV, respectively at these two temperatures. If the cold junction temperature is shifted from 0°C to 30°C, then the emf correction (in mV) is

  • A3.13
  • B2.92
  • 2.61
  • D2.02

Explanation

The emf-temperature slope is 30.5/350=0.08714 mV/°C. Shifting the cold junction reference from 0°C to 30°C requires adding back the emf corresponding to that 30°C offset: correction=0.08714×30≈2.61 mV.

Source: GATE CH 2012 (2012)

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