It does this using thermistors, one exposed and the other insulated. When the resistance drops in the exposed thermistor, the alarm is then triggered.
You can place the static heat detector in dusty or smoky environments where smoke detectors cannot go.Installing detectors with a range of different sensor types will ensure you have all-round protection. Plus, by having a similar external design as Apollo Smoke Detectors, you won’t sacrifice aesthetics.
Please note that bases are not supplied, and sold separately.