HOCHIKI SLR-24H Photoelectric/Heat Smoke Detector

HOCHIKI SLR-24H Photoelectric/Heat Smoke Detector

The SLR-24H can be used in all areas where Photoelectric Smoke Detectors are required. The wide range smoke chamber makes the SLR-24H well suited for fires ranging from smoldering to flaming fires. NS-4 Series, NS-6 Series, HSC-4R or HSC-xxx R Style bases may be used with the SLR-24H. Current interchangeable/compatible devices are the SIJ-24 ionization detector, SLR-24V photoelectric detector and the DCD-135/190 heat detectors. All NS conventional devices are mechanically compatible with Hochiki America HSB, HSC and YBA type bases which may have been used in previous installations. Please check individual panel listings for compatible bases.


Low profile, 2.2″ high (with base) • 2 or 4 wire base compatibility, relay bases available • 135°F Fixed Temperature heat sensor (Latching) • Heat sensor protected by a built-in guard • Highly stable operation, RF/Transient protection • Low standby current, 45μA at 24VDC • Two built-in power/sensitivity supervision/alarm LED’s • Non-directional smoke chamber • Vandal resistant security locking feature • Removable smoke labyrinth for cleaning or replacement • Automatic Sensitivity window verification function meets outlined requirements in NFPA 72, Chapter 2 & 7, Inspection, Testing and Maintenance

Product Description

The SLR-24H photoelectric smoke detector utilizes two bicolored LED’s for indication of status. In a normal standby condition the LED’s flash Green every 3 seconds. When the detector senses that its sensitivity has drifted outside the UL listed sensitivity window the LED’s will flash Red every 3 seconds. When the detector senses smoke and goes into alarm the status LED’s will latch on Red. The detector utilizes an infrared LED light source and silicon photo diode receiving element in the smoke chamber. In a normal standby condition, the receiving element receives no light from the pulsing LED light source. In the event of a fire, smoke enters the detector smoke chamber and light is reflected from the smoke particles to the receiving element. The light received is converted into an electronic signal. Signals are processed and compared to a reference level, and when two consecutive signals exceeding the reference level are received within a specified period of time, the time delay circuit triggers the SCR switch to activate the alarm signal. The status LED’s light continuously during the alarm period.


SPECIFICATIONS: Light Source GaAlAs Infrared Emitting Diode Heat Sensor 135°F Rated Voltage 17.7 – 30.0 VDC Working Voltage 15.0 – 33.0 VDC Maximum Voltage 42 VDC Supervisory Current 45μA @ 24 VDC Surge Current 160μA max. @ 24 VDC Alarm Current 150mA max. @ 24 VDC Ambient Temperature 32°F to 120°F (0°C to 49°C) Color & Case Material Bone PC/ABS Blend Sensitivity Test Feature Automatic Sensitivity window verification test Mounting Refer to NS Conventional Detector Base Data Sheet


There are no reviews yet.

Be the First to Review “HOCHIKI SLR-24H Photoelectric/Heat Smoke Detector”