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How to Convert Thermocouple Readings

Engineers use temperature sensors, including thermocouples and thermistors, to monitor industrial processes that require precise thermal control. A thermocouple, made by joining two wires made of dissimilar metals, produces a small output voltage, typically a few millivolts. The magnitude of the output is determined by the temperature difference between the joint and a constant reference temperature. Each combination of metals produces unique characteristics and the corresponding thermocouple variant is referenced by a universally recognized calibration type code. Thermocouples can measure temperatures in excess of 2,000 degrees Celsius.

Things You'll Need

Thermocouple data readings
Thermocouple reference tables

Instructions

- 1
  Check the type of thermocouple for which you have readings to be converted. Type J, K, T and E are commonly used calibrations. Select the thermocouple reference table that corresponds to your thermocouple type.
- 2
  Check the data to be converted. A reading should consist of a data value in millivolts and a reference temperature, usually in degrees Celsius. Note the first data value.
- 3
  Read down and then across the reference table and find the number closest to the data value to be converted. Note the row and the column that contain this number; this is the reference row and column.
- 4
  Note the temperature value in the leftmost column of the reference row. Note the value at the head of the reference column. Add the two values and record your answer.
- 5
  Note the reference temperature associated with the data value. Add your answer to the reference temperature and record the result, which is the thermocouple reading converted to a temperature measurement.

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