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Analogue Linear Heat Detection Cable
In circumstances where other forms of detection would not be viable, either due to inability to sustain the environmental requirements or through prohibitive costs, Analogue LHDC detects early signs of fire and overheating.
Extensive single zonal lengths of the LHDC may be installed with the ability to trigger alarms for hot spots occurring on very small sections of the overall cable and providing the LHDC has not been subjected to excessive temperatures, the alarm condition can be reset at the zonal controller. This is particularly useful for maintenance and annual testing and can be tested using the Patol proprietary one metre test oven.
How it works
Analogue LHDC is a coaxial cable constructed with a copper coated steel central conductor, an inner insulation (dielectric), a tinned copper braid layer and an overall protective sheath. Additional over sheaths are available for mechanical protection with Stainless Steel armour and nylon to provide resistance to Chemicals and Ultra Violet radiation.
The primary mechanism of heat (fire) detection is that the resistance of the dielectric is monitored between the central conductor and braid layer, which has a negative temperature coefficient (NTC).
Analogue Linear Heat Detection Cable is employed in conjunction with an end of line terminating device for continuity monitoring and a zone monitoring controller providing adjustable alarm thresholds and Fire and Fault outputs.
Products
Cable
Linear Heat Detection Cable (LHDC)
The Patol Analogue Linear Heat Detection Cable (LHDC) is designed to provide early detection of fire and overheating.
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Controllers
LDM-519-LP-LHD Interface for Analogue Cable
The module is designed to monitor a zonal length of Analogue Cable.
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Controllers
LDM-519-SEN-N-LHD Interface for Analogue Cable
The SEN-N Controller is designed to monitor a zonal length of resettable (Analogue) LHDC.
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Controllers
LDM-519-ACT-N-LHD Interface for Analogue with Actuation
The ACT-N controller is designed to monitor a zonal length of Analogue LHDC for elevated temperature states.
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Controllers
EU-R 19" Rack System - LHD Interface for Analogue Cable
The LDM-519-RMA-N cards are designed to monitor a zonal length of Analogue LHDC for elevated temperature states.
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Other
1M Portable Test Oven
The portable 1 metre test oven concept of testing.
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Other
Application Fixings
General guidelines for the installation of LHDC.
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Other
End Of Line Terminators
The End of Line unit resistor values are different for analogue and digital cables.
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Other
Floating Roof Storage Tanks - Ancillaries
A rim seal fire detection system using LHDC can be installed at the edge of the rim seal of a floating roof tank.
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For more information
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