Thermistor and Fire Alarms

A thermistor’s ability to detect temperature makes it a crucial tool for many different industries. One of the most important uses of a thermistor is to create fire alarms that go off when there are sudden and drastic changes to temperature in a given room/area. Older methods of creating fire alarms (ionization alarms and photoelectric detectors) require more than heat to be activated. These devices need heavy smoke or literal fire to work properly, and at that point it might be too late to save lives and property.  Simply put, a thermistor is designed as a temperature sensing element that shows changes in resistance that are in proportion to minor changes in temperature.

thermistorThe thermistor method of detecting fire requires heat to be the only force necessary for activation. Thermistors are set to detect temperatures, and when temperatures are higher than the designated threshold the alarm will sound. There is no need for any smoke to be present, which lessens the amount of false alarms. The thermistor’s base temperature is set to the ambient temperature of the building, and will only activate if there is a quick and drastic spike in temperature. Out of the three methods of detecting fire, the thermistor method works best.

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