Hochiki SLR-835


Detector Photoelectric Smoke Bone Low 2/4-Wire

Availability: In Stock

  • Factory New
  • Material Obsolete
Brand: Hochiki FireAlarm.com Part #: 71597 Categories: , Manufacturer Part #: SLR-835


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.


Weight 0.2 lbs




Production Status



  • 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


Photoelectric Smoke Detector; SLR-835/SLR-835H
Hochiki – Data Sheet