2 Wired Conventional Rate of Raise Heat Detector-System Sensor. The System Sensor non-addressable heat detectors are suitable for connection to 2-wire  non-addressable fire detection control and indicating equipment, or to addressable fire detection control and indicating equipment that can accept non-addressable type detectors. An electronic thermistor sensor provides sensitive rate-of-rise alarm operation, or fixed-temperature operation when the response threshold value is exceeded. These  range of non-addressable detectors provide fire detection and alarm system designers with a Standards- compliant, economical heat detector for property protection applications 2 where smoke or multi-sensor detectors may not suitable due to environmental conditions. Features · Advanced algorithms provide excellent detection discrimination functionality. · Durable sensor. No adjustment or replacement required functionality. · Surface-mount device (SMD) circuit board design for stable and reliable operation functionality. · Dual LEDs for 360° visibility during alarm status. · 2-wire models for DC 12 V and DC 24 V operation wide variant. · Remote LED output option available on these model. · Connects to zone monitor for use with addressable control and indicating equipment on these models. · Easy installation. No programming required on these models. · Sleek low-profile housing design on these models. · Low maintenance for long time. • Low profile design • Low current draw • Backward compatible with Series 100 detector range of bases • Wide operating voltage 8 to 30VDC • Bi-colour LED detector status indicator • Automatic drift compensation • Range of detector bases available • Tested and approved to EN54 – 7:2000 (Amendment 1) EN54 – 5:2000 Class A1R; (Amendment 1) CEA4021