Digital Interface Module

The Digital Interface Module (DIM) monitors the Linear Heat Detection (LHD) cable for both Fire and Fault (open circuit) conditions. Using an additional series resistor, it can also offer discrimination of a short circuit fault on the interposing field wiring. 

With the ability to monitor up to 5000m for both Fire and Fault conditions the DIM enhances any fire detection capability and allows an appropriate action to be taken. 

The DIM has volt free relay outputs for Fire and Fault which can be configured for connecting directly into a conventional fire alarm panel or addressable interface module. 

As well as having Fire and Fault indicators built in, it has two pairs of outputs for driving remote LED indicators for Fire and Fault. 



Technical Description – Digital Interface Module


  • 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 protection.
  • Motor and pump overheat detection.
  • Dirty and dusty environments.
  • Building exteriors under eaves.
Linesense Digital Interface Module

The Specs at a Glance 

Operating voltage: 21 – 30 VDC
Operating Current: Normal: 25 mA (Fault relay energised)

Fire Alarm (max) 56 mA

Indicators: Fire – Red 2 x off.
Fault: Yellow
Power: Green
Outputs Fire: 2 x VFCO relays, 1.0 amp 24 VDC / 120 VAC

Fault: 1 x VFCO relays, 1.0 amp 24 VDC / 120 VAC

Remote indicator outputs: 4 x 100 mA
Inputs: Remote Indicators lamp test.
Maximum length of LHD: 5,000m
Dimensions: H90 x W71 x D58 mm (DIN Rail version)

Data Sheet – Digital Interface Module

SIL2 Certificate

Hover Box Element

Click edit button to change this text. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.