System Sensor 7251 7251DH

7251DH Sensitivity Smoke Detector System Sensor 7251DH detector is designed for duct applications where high velocity high air changes are required for very early warning protection range 32 to 100 0 to 38 velocity rating from 300 to 4,000 FPM VDC operation and quick mounting to round or rectangular ducts from ft to 12 ft 0.3 m to 3.7 m wide year warranty Listings 7251DH high sensitivity duct smoke detector provides performance for management of fans blowers and conditioning systems by using an intelligent laser smoke sensor in an efficient housing design that samples air currents through a duct The twist in twist out 7251 high sensitivity smoke detector head allows easy removal for quick cleaning and replacement without removing the duct housing laser detector achieves sensitivities as low as 0.02 percent per by using a laser diode instead of a standard LED light source the sensing chamber Many sensitive areas cannot tolerate even amounts of smoke This 7251DH detector is designed to valuable assets and operations where systems must remain at all times Telecommunications switching facilities ideal applications for the 7251DH high sensitivity duct smoke include Cellular telephone infrastructure Integrated circuit fabrication facilities Computer rooms Clean rooms 76 Section 8.5.3.1.2.3 Very Early Warning Fire Protection calls for to be mounted at the return air location for a space in the instances shall be installed where return air is brought back to the unit than 0.4 m2 4 ft2 of the return air opening or ports shall be installed such that each covers no stand alone packed HVAC units are installed sensors or System Sensor 7251DH high sensitivity duct smoke detector is to satisfy NFPA 76 for Very Early Warning Fire Protection and audible system annunciation As with our duct detectors all duct smoke detector accessories are UL listed Test Station Key UL S2522 Sounder S3593 Test Station S2522 Annunciator S2522 Duct Smoke Detector Specifications Specifications high sensitivity air duct smoke detector shall be a System Sensor Model 7251DH high sensitivity duct smoke detector The detector shall be UL listed per UL Standard for Smoke Detectors for Duct Applications specifically for use in air handling systems The detector shall operate at air velocities from 300 feet minute to 4000 feet per minute The detector shall have an operating temperature range of 32 to 100 The detector housing shall be equipped with an mounting base capable of accommodating laser smoke detector heads It shall be capable of local testing via magnetic switch or remote testing using RTS451KEY or RTS451 Remote Test Station The duct detector housing shall incorporate an airtight smoke chamber in compliance with UL S911 The housing be capable of mounting to rectangular or round ducts up to 12 ft wide without adapter brackets An integral filter system shall be included to reduce dust residue effects on detector and housing thereby reducing maintenance and servicing Sampling tubes shall be installed after the housing is mounted to duct by passing through the duct housing Terminal connections shall be of the strip and clamp method suitable for 14 to 18 AWG wiring Specifications Weight Temperature Range Temperature Range Humidity Range Duct Velocity in L 5 in W 4 in D 36.8 cm L 12.7 cm W 10.2 cm D lbs 1.1 kg to 100 0 to 38 to 100 to 38 to 93 relative humidity 24 VDC without communication 330 24 VDC one communication every 5 sec with LED enabled mA LED on Specifications supply voltage Requirements Using No Accessories standby current alarm current VDC to 32 VDC sensitivity duct smoke detector sensitivity duct smoke detector Canadian model intelligent laser sensor head Information No sampling tube duct widths 1 ft to 2 ft 0.3 m to 0.6 m sampling tube duct widths 2 ft to 4 ft 0.6 m to 1.2 m sampling tube duct widths 4 ft to 8 ft 1.2 m to 2.4 m sampling tube duct widths 8 ft to 12 ft 2.4 m to 3.7 m cap for metal sampling tubes test station with key test station sounder white annunciator alarm LED air filters two per package magnet installation kit mounting hardware System Sensor specifications subject to change without notice Visit systemsensor com for product information including the latest version of this data sheet