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Honeywell’s Linear Heat Detection Cable (LHDC) is a continuous heat detector that can detect heat (due to fire or other events) at any point along its entire length. The cable is composed of two twisted-shield conductors, insulated with a heat-sensitive polymer, then wrapped with a protective tape and finished with an outer covering.
Honeywell’s Analogue LHDC consists of insulators whose resistance varies proportionally to changes in temperature. This cable is self-restorable after the fire event as long as temperature does not exceed its specified resettable temperature limit of 120°C.
The Digital LHDC from Honeywell is a fixed-temperature, non-resettable cable from Honeywell, the worldwide leader in fire safety solutions. Each cable consists of low-resistance, twisted-pair, tri-metallic conductors, sheathed in thermal polymers that are chemically engineered to break down at specific fixed temperatures. This property allows the twisted conductors to make contact and initiate alarms at the control panel without the need to calibrate for ambient temperature changes. This UL/FM approved cable is installed in conjunction with an EOL device for continuous monitoring. System monitoring through an associated electronic interface unit provides fault indication of open and short circuit conditions on the sensor cable.
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