DTSX1 Fiber Optic LHD Controller


Key Features

  • Compliant with EN54-22
  • Connect up to four 16km cables 
  • Rapid detection and localisation
  • Wide temperature range 
  • Sensor, relay and display in a single box


The DTSX1 employs Distributed Temperature Sensing (DTS), a type of linear heat detection whereby the fibre optic cable itself is the heat sensing element, capable of providing near-pinpoint locations and temperature accuracy across long distances.

Capable of detecting high heat over a wide area quickly and precisely, the controller incorporates all heat detection functions in a single box along with relays and display. Easily configurable, the alarm display and sounder can be programmed to your specific requirements, enabling rapid early warning of fire and identification of heat alarm conditions.

In addition to the DTSX1 Fiber Optic LHD Controller, all you need to create a LHD system is a LHD Fiber optic cable – up to four can be connected to the controller on separate channels giving a total range of up to 64km. 

The DTSX1 controller excels at heat sensing over long distances and a wide temperature range of -25° to +70°C due to an innovative light scattering principle which not only allows differences in temperature to be accurately recorded, but also accurately located along the length of the cable.

The DTSX1 can accurately detect multiple hotspot locations simultaneously and sound the alarm at various presets to protect important assets before rising temperatures result in fire or require intervention.



DTSX1 fully complies with UK safety standards as well as EN54-22, the European fire safety standard governing linear fire detection systems and their components.

Tech Specs

Measurement distance range2, 4, 6, 8, 10, 16km
Number of channels1, 2, 4
Spatial resolution1m or less (The length at which a 10% to 90% temperature change is detected at the near end of the fiber optic sensor cable when sampling a 16 km or less range at 0.5m intervals)
Sampling resolutionMeasuring temperature at 0.5m or 1m intervals
Minimum temperature measurement time5 seconds
Measurement modeSingle-ended, double-ended
Number of zones configured1,000 (no overlapping)
Optical outputE2000/APC 50/125μm GI
LAN10BASE-T or 100BASE-TX Modbus/TCP
Relay output8, 64 ports, max 35V/1A DC
Relay input4 ports ON: 12 to 30V/5mA DCOFF: 3V/2mA DC
SwitchRESET: Alarm state resetACK: Alarm acknowledgement (Hold the alarm state)
Power supplyVoltage 10 to 30V DC(Rated voltage: 12 to 24V DC)
Power consumption30W (normally 15W at 23°C ambient temperature)
Dimensions (W×H×D)500mm × 500mm × 250mm
Mount typeWall mount


DTSX1 Fiber Optic LHD Controller Datasheet


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