Discovery Marine Heat Detector

Discovery Marine Heat Detectors have a common profile with ionisation and optical smoke detectors but have a low air flow resistance case made of self-extinguishing white polycarbonate.

The Discovery Marine Heat Detector uses a single thermistor to sense the air temperature at the detector position.  The thermistor is connected in a resistor network, which produces a voltage output dependent on temperature.  The design of the resistor network, together with the processing algorithm in the microcontroller, gives an approximately linear characteristic from 10°C to 80°C.  This linearised signal is further processed depending on the response mode selected, and converted to an analogue output.