Temperature Coefficient

The temperature coefficient describes the rise in measurement error when taking pyrometric temperature measurements if the ambient temperature deviates from the reference temperature of 23 °C ± 5 °C.

The temperature coefficient is specified either in K/K or in %/K. A specification in K/K describes how many K the measurement uncertainty increases with a change of one K in the device’s temperature. Values of 0.05 K/K are not uncommon for pyrometers. For example, if the device’s temperature were to increase from 23 °C to 33 °C, a change in the measured value display of up to 0.5 K would be possible. A specification in %/K describes by how many percent (in °C) the measurement uncertainty increases when the device’s temperature changes by one K. For example if the device’s temperature were to increase from 23 °C to 33 °C at a measurement object temperature of 500 °C, a change in the measured value display of up to 1.0 K would be possible with a temperature coefficient of 0.02%/K.