RL4 smoke detector for ventilation ducts

  • for monitoring ventilation ducts in connection with a fire alarm system or the building management system
  • for the control of ventilators
  • without alarm and fault storage in case of power failure
  • VdS recognition G 221008

Product Info

The RL4 basic and RL4 pro smoke detectors in accordance with DIN EN 54-27 are used for monitoring ventilation ducts, for controlling associated fans, as part of the building management system or the fire alarm system for detecting smoke in ventilation ducts. In this way, necessary control scenarios to prevent smoke transmission to other fire compartments are activated at an early stage. The cost-effective RL4 basic and the RL4 pro smoke detector for ventilation ducts, which is equipped with further convenient features, offer you the following advantages:

  • installation independent of position and direction of air flow
  • fast and tool-free access to the smoke switch for easy functional testing
  • installation with a small distance of only 1.5x hydraulic diameter to points of failure (in front and behind)
  • evaluation electronics encapsulated and constructively protected against contamination
  • universal power supply for 230V AC or 24V AC/DC with automatic recognition
  • cable glands with strain relief for up to seven connection lines
  • TEST/RESET directly at the device and externally via input of the BMS interface
  • protective screen to protect the smoke switch from coarse contamination

The advantages of the pro-Version:

  • LCD display with comfortable operation
  • galvanically isolated RS485 interface with BACnet MS/TP or Modbus RTU protocol
  • integrated flow monitoring
  • visualization of the contamination level via LED

Product presentation RL4 pro

Help for product selection

 Smoke detectors according to DIN EN 54-27 with VdS recognitionSmoke release devices according to DIN EN 54-27 with VdS recognition and DIBt approvalSmoke release devices with DIBt approval
 RL4 basicRL4 proOR4 basicOR4 proOR32
 Bild RL4 basicBild RL4 proBild OR4 basicBild OR4 proBild OR32
Area of application     
  • for detection of smoke in ventilation ducts
  • for the control of ventilators
  • for control and triggering of fire and smoke dampers for ventilation ducts
  • for the control and triggering of fire and smoke dampers for overflow openings
  • for use in particularly confined installation situations


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