Discussion
Consider the following statements about temperature measurement:
1. A thermocouple output depends on the difference between hot and cold junctions.
2. Cold junction compensation converts that difference into an absolute reading.
3. Turbine inlet temperature is measured directly by a probe at the combustor outlet.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
The first two describe thermocouple practice correctly. The Seebeck output depends on the difference between the hot and cold junctions, and cold junction compensation adds the reference temperature back in so that the display reads the absolute temperature of the hot junction.
The third is false. The combustor outlet is too hot for a probe to survive there, so turbine inlet temperature is inferred from a measurement further downstream - at the exhaust or between turbine stages - using a relationship established during engine development.
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