Smoke/Heat Detector with Base BS-657 921657002

The BS-657/A is a conventional smoke detector which integrates functions of optical smoke and heat detection. It can detect smoke and heat. The detector transitions to alarm state when o the concentration of smoke reaches 0.107dB/m or when the temperature reaches 57 C. o Also, the detector transitions to alarm state when the temperature rises suddenly by 32 C regardless of the initial temperature at the beginning of the sudden rise event.