HOCHIKI ALK-V Photoelectric Smoke Sensor
The HOCHIKI America ALK-V Photoelectric Smoke Sensor is particularly suited to detecting optically dense smoke typical of fires involving materials such as soft furnishings, plastic, foam or other similar materials which tend to smolder and produce large visible smoke particles. Hochiki’s unique design allows fast response to flaming fires as well as smoldering fires while eliminating nuisance alarms.
Low Profile – Only 2.0″ high, including base • Simple and reliable device addressing method • Automatic compensation for sensor contamination • Built-in fire test feature • Uses the noise immune Digital Communication Protocol (DCP), which utilizes interrupts for fast response to fires • Two built-in power/alarm LED’s • Programmble Non-polling LED’s • Non-directional smoke chamber • Vandal resistant security locking feature • Removable smoke labyrinth for cleaning or replacement • Compatible with the AIE-EA ionization detector, ALG-V Photoelectric detector & the ATG-EA heat detector • Smoke chamber design reduces the susceptibility to nuisance alarms caused by steam. S
The detection chamber consists of a light emitting diode (LED) and photodiode arrangement. The chamber is designed such that light emitted by the LED cannot normally reach the photo diode. In the event of fire, particles of smoke enter the chamber and scatter the light. As the smoke level increases, the scattering effect increases, causing more light to hit the photodiode. The chamber contains a unique baffle design which allows smoke to enter the chamber while preventing external light from affecting the photodiode. The photodiode input level is sampled to sense smoke density. When the smoke density exceeds a preset threshold the sensor transmits an interrupt to the fire control panel indicating a fire condition. The fire alarm control panel can adjust the sensor threshold to compensate for contamination. Up to 127 devices are permitted on each loop. A sensor address can be set by a hand held programming unit. The sensor mounts to an electronics free base and incorporates a locking mechanism for secure installation. The base provides mounting slots, terminals for field wiring and a third contact for a remote indicator/LED. The sensor incorporates dual LED’s for easy viewing of sensor status.
SPECIFICATIONS: Operating Voltage 17-41 VDC Standby Current 390μA Alarm Current 800μA Transmission Method DCP – Digital Communication Protocol Maximum Humidity 95% RH Non-Condensing UL Ambient Installation 32°F to 100° F Temperature Range (0° C to 37.8° C) Operating Temperature 14°F to 122° F Range (-10° C to 50° C) Sensitivity Range 0.5 – 3.8%/FT@300FPM 0.5 – 2.74%/FT@2000FPM 0.5 – 2.68%/FT@4000FPM Air Velocity Range 0-4000 fpm Color & Case Material Bone PC, Black / ABS Blend Weight 3.4oz (5.1 oz. with 4″ base) Bases 4″ YBN-NSA-4 6″ HSB-NSA-6 & ASB