All FOTEMP-family monitoring solutions for temperature measurements can be used in electromagnetically strongly influenced environments, in microwave fields, power plants or explosion- proof areas and wherever measurement with electrical temperature sensors is not possible.

The outer jacket of the fiber optic temperature sensors is made out of Teflon material, at the sensor tip a GaAs-crystal (gallium arsenide) is attached. The probe sensor is completely non-conductive. Optocon fiber optic sensors offer complete immunity to RF and microwave radiation with high temperature operating capability, intrinsic safety, and non-invasive use. The probes are also designed to withstand harsh and corrosive environments.

Starting at a light wave length of 850 nm GaAs becomes optical translucent. Since the position of the band gap is temperature dependent, it shifts about 0.4 nm/ Kelvin. The measurement device contains a light source and a device for the spectral detection of the band gap. This guaranties fast, repeatable and reproducible measurements.