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Todays conveyors can be found in a multitude of applications and environments; it can be a short conveyor moving waste material in a recycling centre, ore transported over many kilometres of open countryside or carrying coal in a mine.
Linesense digital LHD is suitable where Standard detection methods would find it difficult to work. Areas where it could be exposed to the effects of wind and rain or high levels of dirt and dust. Environments where other detectors require additional measures to prevent dust blocking sample points or obscuring optics. The long term reliability of digital LHD reduces the need for increased maintenance or holding stock of costly consumable spares.
With the distances that some conveyors transport material reaching many kilometres in length, LHD offers a flexible cost effective solution no matter the size and type of environment.
The sensing cable is formed from a pair of twisted steel conductors each with temperature sensitive insulation and then an overall outer sleeve. When the temperature sensitive insulation reaches it’s predetermined alarm temperature the two conductors short together providing the digital or switched signal.
The cable can be connected to any unit capable of monitoring a switched signal, i.e. conventional fire panel, addressable switch monitor unit or PLC.
The fire detection capability can be enhanced when the LHD is used in conjunction with the Digital Location Interface (DLI). Conveyors can be many kilometres long, so identifying where a fire is located helps speed up decisions.
The DLI has the ability to monitor up to 2,000m or 10,000m of LHD (depending on the unit selected) for both Fire and Fault conditions, when activated it identifies the location of the alarm. The distance in meters is displayed on the 3½ digit LCD and allows for appropriate action to be taken.
Linesense provide a selection of fixings and clips to retain the Linear Heat Detection (LHD) cable in place. Fixings should be placed at intervals of no more than 1.2m apart.
Where cable ties are used they should be used in conjunction with a neoprene sleeve and not over tightened to prevent damage to the outer sleeve of the LHD.