The Thermac detector is a heat sensitive electrical switch. It is a fixed temperature device with a factory pre-set temperature in the range 60 OC to 240 OC
The detector comprises a pair of normally open electrical contacts mounted within a stainless steel probe. A rise in temperature will cause the contacts to close at the set point temperature. With a drop in temperature the procedure reverses and the contacts re-open below the set point temperature.
The detector body is a seamless one-peice unit, precision machined from AISI 316 stainless steel with high corrosion resistance.
Electrical contacts are gold / silver plated and lead cables are nickel plated copper with PTFE / glass insulation. Cables are to aircraft engine specification.
The operating parts are factory calibrated and sealed against severe environmental conditions, further adjustment or calibration is not required.