Photoelectric Smoke Detector

• Modi International
• New Delhi

Photoelectric Smoke Detector

Modi International offer Photoelectric Smoke Detector. The heat detectors incorporate a pulsing LED located in a labyrinth within the housing of the detector and resettable and operated by using a matched pair of thermistors to sense heat. One thermistor is exposed to the ambient temperature, the other is sealed. In normal conditions the two thermistors register similar temperatures, but , on the development of a fire, the temperature recorded by the exposed thermistor will increase rapidly, resulting in an imbalance of the thermistor and causing the detector to change to the alarm state. Rate of rise detectors are designed to detect a fire as the temperature increases but they also have a fixed upper limit at which the detector will go into alarm if the rate of temperature increase has been too slow to trigger the detector earlier.