What are Heat detectors on ships?

Heat detectors use a set of temperature-sensitive resistors called thermistors that decrease in resistance as the temperature rises.

One thermistor is sealed and protected from the surrounding temperature while the other is exposed. A sharp increase in temperature reduces the resistance in the exposed thermistor, which allows a large current to activate the detector’s alarm.


Heat detectors are normally used in dirty environments or where dense smoke is produced.

Heat detectors may be less sensitive, but are more appropriate than a smoke detector in these environments. The most common heat detectors either react to a broad temperature change or a predetermined fixed temperature.

Heat detectors are ideal for areas where flammable gasses and liquids are handled or any area where a fire will quickly cause a large change in the surrounding temperature. Heat detectors are also suitable for:

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