Our heat flux sensors are calibrated in-house using a traceable heat flow meter setup.

The relative measurement uncertainty of the calibration is 5%.

The calibration factor is linearly dependent on temperature.

The temperature dependence is specified in the individual test report and is approximately 0.1% per K.

Under normal use conditions, the calibration factor remains stable over decades.

Recalibration of sensors from our production older than 20 years has shown no measurable drift in the calibration factor.