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No TT8, Tam Dao, Ward 15, District 10, Ho Chi Minh city

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No B02, Nguyen Huu Tho, Hoang Mai district, Ha Noi

Hochiki Conventional Smoke Detector

  • Photoelectric smoke detector

Photoelectric smoke detector

Code: SLR-835
Manufacturers: Hochiki
Origin: USA
Download Catalogue: SLR-835 (230,98 KB)


The HOCHIKI America SLR-835/-835H can be used in all areas where photoelectric smoke detectors are required. It is suited for fires ranging from smoldering to flaming fires. NS4 Series, NS6 Series, HSC-4R or HSC-(X)R Style bases may be used with the SLR-835/-835H. 


The SLR-835/-835H 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. 


• Low Profile - Only 1.8" high (2.2" 835H)

• 2 or 4 wire base compatibility, relay bases available

• 135°F latching heat sensor (835H only)

• Heat sensor protected by a built-in guard (835H only)

• Highly stable operation, RF/Transient protection

• Low standby current

• Two built-in power/sensitivity supervision/alarm LEDs

• Non-directional smoke chamber

• Vandal resistant security locking feature

• Removable smoke labyrinth for cleaning or replacement

• Backwards compatible with Hochiki SLK and SIH detectors

• Automatic Sensitivity window verification function meets outline requirements in the NFPA 72 Inspection Testing and Maintenance, Chapter 7 


Light Source: GaAl AS infrared L.E.D.

Operating Voltage: Nominal: 12 VDC or 24 VDC

Working Voltage: 8.0-35.0 VDC

Wave Form: Filtered DC 15% Ripple Max

Heat Sensor: 135° F (835H only)

Supervisory Current: 38μA AVG @12 VDC 55μA AVG @24 VDC 70μA AVG @35 VDC

Surge Current: 200μA Max @24 VDC

Alarm Current: 150mA Max

Ambient Temperature: 32° F - 120° F (0°C - 49°C)

Compatibility Identifier: HD-3

Color & Case Material: Bone/White PC/ABS Blend

Sensitivity Test Feature: Automatic Sensitivity window verification Test

Ordering Codes: White: SLR-835W/SLR-835HW Bone: SLR-835/SLR-835H

Dimensions: 1.8" (2.2" 835H) H x 3.94" W

Mounting: Refer to NS Conventional Detector Base Data Sheet

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