A heat sensor fire alarm is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The heat sensor fire alarm detects fires with and without smoke development. It is the detector of choice where rapid fire development and high temperatures might be expected or when smoke detectors cannot be deployed due to environmental influences.
Here are their working principle：
Set to alarm when ambient temperatures reach a fixed point, typically indicating a fire, fixed-temperature heat sensor fire alarms are a highly cost-effective solution for many property protection applications. If rapid response to fire is vital, rate-of-rise heat sensor fire alarms are an ideal solution where rapid temperature increases would only be caused by a fire emergency. Combination heat sensor fire alarms provide both fixed and rate-of-rise detection. This enables the heat sensor fire alarm to communicate an alarm to the central control panel prior to reaching its fixed set point for high rates of rise, providing a timely response to both rapid and slow temperature increases.
With fixed temperature 57℃ heat detection and rapid “rate-of-rise” temperature detection, you can ensure that your residence is completely prepared in the unfortunate event of kitchen fires, electrical fires, and other highly dangerous fires.
Sumring heat sensor fire alarms combine the best features of both fixed temperature and rate-of-rise thermal detection, these units accurately sense the surrounding air temperature regardless of the fire growth rate. Designed with a rugged outer shell, these units can withstand various shock and vibration conditions. More detail：please click-heat sensor fire alarm