SNA-360 analogue addressable photoelectric smoke/heat detectors are microprocessor controlled state-of-the-art Detectors compatible with popular control and indicating equipment loop protocols. Advanced electronics in conjunction with a photoelectric smoke sensing chamber and an electronic thermistor provide Early detection of fire and high immunity against unwanted alarms. The heat sensor provides sensitive rate-of-rise Operation or fixed-temperature operation when the response threshold value is exceeded. Photoelectric smoke and heat sensors Analogue detection discrimination Dual leds for 360° visibility Dc 24 v operation 2-wire connection to many popular loop protocols Dip switch address setting 125 usable detector address settings per loop Optional remote led output