Key Features

  • UL 521 approved and compliant with the EN54:22 draft standard
  • Self-restorable analogue type system with optional pre-alarm setting
  • Cable based sensing allows detection at the point of risk
  • Low installation, maintenance and repair costs
  • Reliable solution for hazardous areas


A Nylon coated cable is the common choice when hazardous hydrocarbons such as fuel oils, diesel, kerosene etc. are present. Nylon cables are coloured black and provide suitable UV protection when used in direct sunlight. Nylon is much tougher than PVC and therefore provides additional mechanical protection.

Sensing Cable Construction

FyreLine Analogue Linear Heat Detection cable is constructed using a pair of copper conductors coated in a temperature sensitive polymer whose resistance changes as a function of temperature. A calibration resistance (white) and average ambient temperature sensor (red) core are also twisted with the two original conductors. A foil shield and protective outer coat is extruded over the twisted core.


The FyreLine analogue linear heat detection cables are fully approved by the Underwriters Laboratories (UL) and bears the CE mark to show that they comply with all the applicable Directives including the CPR, EMC and the Low Voltage Directive (LVD).

  • UL 521
    Heat detectors for fire protective signaling systems.

Tech Specs

Outer JacketBlack Nylon
Overall Diameter5.50mm ± 0.075mm (0.217” ± 0.003”)
Humidity0% to 99% RH
RFI ShieldingTwisted and foil shielding to reduce inductance and RF susceptibility
CoresCalibration Resistance: White
Sensor Core: Red
Conductor & Specially Doped Polymer Core: Clear
Conductor & Specially Doped Polymer Core: Clear
Maximum Continuous Length500m (1640ft)
Minimum Continuous Length30.5m (100ft)
Operating Temperature Range-40ºC to 125ºC
Continuous Ambient Temperature Range-40ºC to 90ºC



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