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Photoelectric Smoke Detectors for Fire Alarm Systems


  Commercial Products Group SLR24V - Photoelectric Smoke Detector


Our Price : $41.63

Product Code: CPGSLR24V





Low profile, 1.8" high (with base)

2 or 4 wire base compatibility, relay bases available

Highly stable operation, RF/Transient protection

Low standby current, 45μA at 24VDC

Two built-in power/sensitivity supervision/alarm LEDs

Non-directional smoke chamber

Vandal resistant security locking feature

Built-in magnetic go/no go detector test feature

Removable smoke labyrinth for cleaning or


Automatic Sensitivity window verification function

meets outlined requirements in NFPA 72, Chapter 2

& 7, Inspection, Testing and Maintenance

Compatible with SIJ-24 ionization detectors

Backwards compatible with Hochiki SLK and

SIH detectors




Light Source                 GaAlAs Infrared

                                    Emitting Diode

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. @ 24VDC

Alarm Current                150mA max. @ 24 VDC

Air Velocity Range         0-4000 fpm

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


The SLR-24V can be used in all areas where Photoelectric

Smoke Detectors are required. The wide range

smoke chamber makes the SLR-24V 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-24V. Current

interchangeable/compatible devices are the SIJ-24

ionization detector, the SLR-24H photoelectric detector

with heat sensor, 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.


The SLR-24V photoelectric smoke detector utilizes two

bicolored LEDs for indication of status. In a normal

standby condition the LEDs flash Green every 3 seconds.

When the detector senses that its sensitivity has

drifted outside the UL listed sensitivity window the LEDs

will flash Red every 3 seconds. When the detector

senses smoke and goes into alarm the status LEDs 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 LEDs light continuously

during the alarm period.


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