PRODUCT OVERVIEW

Heat Detector (FW5500-450)

The FW Heat Detector has a molded white polycarbonate case with wind resistant smoke inlets. Inside the case, a printed circuit board holds the signal processing electronics The AR, BR, and CR variants contain a pair of matched negative temperature coefficient NTC thermistors that are mounted to the PCB in a way that one thermistor is exposed to give good thermal contact with the surrounding air while the other thermistor is thermally isolated. Under stable conditions both thermistors are in thermal equilibrium and have the same value of resistance͘ If the air temperature increases rapidly the resistance of the exposed thermistor becomes less than that of the insulated thermistor͘ The ratio of the resistance of the thermistors is monitored electronically and an alarm is initiated if the ratio exceeds and factory pre-set level͘. This feature determines the rate of rise response of the detector͘

Ideal for environments that are dirty or smoky un der normal circumstances

Can be used for applications where smoke detectors are unsuitable

Wide operating voltage