One thermistor is exposed to the ambient temperature, the other is sealed.
In normal conditions the two thermistors register similar temperatures, but on the developement of a fire,
the temperature recorded by the exposed thermistor will increase rapidly,
resulting in an imbalance of the thermistors and causing the detector to change to the alarm state.
A Rate of Rise sensor has a fixed upper limit, but in addition, measures the rate of increase in temperature.
AlarmSense sensors must be mounted on AlarmSense bases (45681-244)
Dimensions: 100mm x 42mm
Fitted with 2 LEDs for 360° visibility