UL Listed En Certified Heat Detector Fire Alarm

Conventional Heat DetectorAll of the Sentek'sHD912 series detectors meet the requirements of UL521 and EN 54-5 for use in fire alarm signaling systems, which provide fast and reliable response for heat 57°C (135°F)  or Rate-of-Rise detection,  They are intended for use in 2-wire/4-wire Class A2 supervised zone circuits. The HD912 series detectors are subject to panel compatibility limits and compliance with corresponding NFPA 72E standards, local codes, and ordinances.  Response Temperature: 57°C (135°F) Ceiling Spacing: 50 foot rating for heat sensor Reset Voltage: less than 1 volt Alarm Indicator: LED continuously emitting red light Remote Output: 25 mA max., diode gate Temperature Range: -10°C to 50°C Permissible Current: 80mA maximum Humidity: 0 to 95% RH, no condensation or icing Alarm Contact: (for 4-wire) NO or NC Operation, Form A: 1.0A@30VDC/0.5A@125VAC Dimensions: 100mm (dia) x 46mm (ht) with base Weight: 120g/set with base   Product Features:2 or 4 wire modelsAdvanced detection and discrimination algorithmsEasy installation and maintenanceSleek low-profile housing designDurable sensor head, no need for replacement SMD circuit board design-satisfactory quality and reliability guaranteedN/C (normal/close)-N/O (normal/open)selectable relay outputAR (Auto Reset) function for security systems (optional for 4 wire models)Sensor base option: standard and Shottky DiodeFive-year limited warranty The range includes:HD912-2                   2 wire heat alarmHD912-2L                 2 wire heat alarm with remote LED outputHD912-4                   4 wire heat alarm (12/24VDC)HD912-4B                4 wire heat alarm with buzzer (12/24VDC)HD912-4AR              4 wire heat alarm with auto-reset function (12/24VDC)HD912-4ARB           4 wire heat alarm with auto-reset function and buzzer (12/24VDC)  /* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1