PERTRONIC INDUSTRIES LTD
DATASHEET
Linear Heat Detection Cable (LHD)
Overview
The Linear Heat Detection Cable (LHD) is designed for
use where traditional point heat detectors are unsuitable.
The LHD is a fixed temperature sensor capable
of initiating an alarm if its temperature threshold is
exceeded.
It consists of two tri-metallic conductors twisted together
to keep them under mechanical tension. Each conductor
is individually coated in a temperature sensitive polymer
that detects heat conditions anywhere along its length.
It is not required that a specific length be heated in
order to initiate an alarm. Therefore, LHD provides the
advantage of line coverage with point sensitivity.
LHD cable is available with a PVC or Nylon outer sheath.
Typical applications include tunnels, mining,
manufacturing, warehousing, cold stores, communications
and general industry, etc.
Features Linear Heat Detection Cable
» Suitable for use with Pertronic NZS 4512:2010
conventional zones of Loop Responder, Apartment
Module, F1, F4, F16e
» Simple installation using standard 10 kΩ EOL
resistor and one alarm resistor in series with the
LHD cable
» Can be used for Hazardous areas with Galvanic
Isolator
» Available: 200 m and 500 m drums
» Maximum Zone Length: 3,000 m
» International Approvals: CE marked, RoHS
compliant, UL, FM, GOST-R
» Available temperature thresholds: 68 °C, 78 °C,
88 °C, 105 °C
Specification
Construction Dual insulated, twisted pair of tri-metallic cores
Insulation 1 kV tested protective outer coat
Wire Overall Diameter 3.6 mm
Minimum Bend Diameter 50 mm @ >0 °C
100 mm @ ≤ 0 °C
Ambient Temperature -40 °C to 45 °C, for 68 °C or 78 °C activating
-40 °C to 70 °C, for 88 °C or 105 °C activating
Maximum Voltage Rating 30 Vac / 42 Vdc
Resistance ~200 Ω/km
Outer Colour Red
LHD Product SS-LD-68 SS-LD-78 SS-LD-88 SS-LD-105
Capacitance (pF/m) 150 121 97 88
Inductance (nH/m) 960 750 540 1050
Typical Applicatons
Cable Trays
Typical Locations
for LHD
Conveyor Belts Floating Roof Storage Tanks
Rack Storage Area Protection
Typical System Configuration
Ordering Information
Product Code Description
SS-LD-68-155 Linear Heat Detection Cable, PVC Sheath, 68°C, in 200 & 500m Drums
SS-LD-78-172 Linear Heat Detection Cable, PVC Sheath, 78°C, in 200 & 500m Drums
SS-LD-88-190 Linear Heat Detection Cable, PVC Sheath, 88°C, in 200 & 500m Drums
SS-LD-105-221 Linear Heat Detection Cable, PVC Sheath, 105°C, in 200 & 500m Drums
SS-LDN-78-172 Linear Heat Detection Cable, Nylon Sheath, 78 C, in 200 & 500m Drums
RESFR1610K EOL Resistor 10KΩ, 0W5, 5%
RESFR16330R Series Alarm Resistor 330Ω, 0W5, 5%
RESFR16100R Series Alarm Resistor 100Ω, 0W5, 5%
On request Linear Heat Detection Cable, Nylon Sheath, other temperature thresholds
The information in this document must not be treated as partial or complete instructions for the design, construction, installation, commissioning, or
maintenance of fire detection, fire alarm, or building evacuation systems. Fire and evacuation systems must be designed and installed by properly
qualified persons, in accordance with all regulatory requirements.
Unless explicitly stated otherwise, this document provides typical specifications and nominal dimensions. Actual product performance and
dimensions may vary.
All information in this document is subject to change. Please consult Pertronic Industries or visit our web site for up to date information.
PERTRONIC® is a registered trademark of Pertronic Industries Limited.
Pertronic Industries Ltd
www.pertronic.co.nz 0940-LHD-Cable-DS-NZL-20211012
