Linesense Digital Location Interface

(Monitoring distance 2km)

Dimensions: H200 x W164 x D116 mm
Part Number: 52100-001 & 52100-003


The Digital Location Interface (DLI) monitors the Linear Heat Detection (LHD) cable and when activated identifies the location of the alarm. The distance in meters is then displayed on the 3½ digit LCD. Providing detection and location along the complete length of the LHD cable.

With the ability to monitor up to 2000m of LHD for both Fire and Fault conditions the DLI enhances any fire detection capability and makes it ideal for applications such as road and rail tunnels or cable trays and conveyors. When used with Intrinsically Safe barriers it can also be used for hazardous area applications.

The DLI offers flexible interfacing options; designed as a two wire device for connecting directly into a conventional fire alarm panel it also has the ability to signal via volt free relay contacts for Fire and Fault, additionally it has a 4-20 mA output representing 0m to 2000m. The effect of any field wiring can be subtracted at the commissioning stage, therefore the display will only give readings for the zone being monitored.

The DLI is available as a DIN Rail mountable unit or fitted into an IP 65 weather proof enclosure.

The DLI-2K has been third party assessed to IEC61508 and is certified as being SIL2 Capable.


  • Volt free relay outputs for Fire and Fault
  • Provides monitoring of faults on both field wiring and the LHD
  • LED Fire and Fault indicators
  • Remote LED indicator outputs for both Fire and fault
  • Fire and Fault Test Functions
  • Suitable for monitoring hazardous area applications when using safety barriers
  • DIN Rail compatible


  • Power Generation
  • Cable Trays / Tunnels
  • Road and Rail Tunnels
  • Car Parks
  • Conveyors (Bearing) protection
  • Storage racks warehouse, Refrigerated rooms and cold stores
  • Petro-chemical storage tanks, rim seal


Operating voltage:

14 - 30 VDC Two wire mode
20 - 30 VDC Relay mode

Operating Current Normal:

1.7 mA Two wire mode
11.5 mA Relay mode.

Fire Alarm (max):

12 mA Two wire mode
29 mA Relay mode.

Fault Condition:

700 uA




2 x VFCO relays, 1 amp 24 VDC / 120 VAC Resistive


2 x VFCO relays, 1 amp 24 VDC / 120 VAC Resistive

4 - 20 mA signal loop output



3½ Digit (Accuracy ±1 digit, Tolerance ±3%)


Remote Reset

Maximum length of LHD:




H105 x W86 x D58 mm (DIN Rail version)
H200 x W164 x D116 mm (Polystyrene enclosure)
Cable entries: 4 x M20, 1 x M25 Top
4 x M20, 1 x M25 Bottom
2 x M20 each side.


SIL-2 Capable - Third party assessed to IEC61508

Ordering Information

Part Number



DLI-2K Digital Location Interface 2Km (IP65 Enclosure)


DLI-2K Digital Location Interface 2Km (DIN rail version)

Note: If installation requires hazardous area safety barriers add the following suffix’s to part numbers: -G for use with Galvanic isolator and –Z for use with Zener barriers.

Download Product Data sheet

Download Product Manual

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