Addressable LHS Digital Interface Unit


Addressable Digital LHS Cable Interface Unit

This unit is engineered to monitor the status of the Digital Liner Heat Sensing (LHS) cable and communicate the same to the panel. It is powered by the Signalling Line Circuit from the panel and is brought to connection with the Digital LHS cable for monitoring. Apart from monitoring the temperature status of the LHSC, it also reports breakage by using end of line resistor. It determines the exact location of fire by tracing the 'hot spot' in the LHS cable.

Exclusive Features
  • Remote LHS heat sensitivity alteration from the panel
  • Detailed location description settings
  • Address can be changed from the panel
  • Soft addressing
  • Pre alarm
  • Remote test facility from the panel
  • Electrical supervision
  • LED indicator
  • Easy to maintain/service
Technical Summary
Electrical Specifications 
Operating voltage : 17-24V DC
Quiescent current : 600 µA
Alarm current : 1 mA(max)
Normal : Green LED (Blinks during scan)
Alarm : Red LED (Glows steady)
General Specifications
Operating temperature : 0ºC to 49ºC 
Storage temperature : 5ºC to 40ºC 
Humidity : 0-95% RH (Non-condensing)
Color : Red
Housing : Top-plastic, Bottom-Mild Steel
Compatibility : AU101X Protocol
Mechanical Specifications
Dimensions(HXWXD) : 120x120x48mm
Without Backbox : 108g
With Backbox : 378g
Know More

What are Linear Heat Sensing Cables and how do they work?

Linear Heat Sensing Cables (LHS cables) are heat sensors that offer heat detection through out its length. They can be used at cable trays, storage racks, conveyors etc. for early fire detection, where an installation of a detector device is impractical.

LHS cables are of type Analog and Digital. Each consists of two cores of copper wire with a polymer separating them. They detect heat as the resistivity separating polymer varies in proportion to the temperature in its surveillance.

LHS Interface Units are those that interface communication and settings of the LHS cable with the Control panel. 

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Analog LHS Interface Unit

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