System Sensor SS LD 68 155 Digital Linear Heat Detector Cable

KTI07001001AHSS

Product Description

The System Sensor SS-LD-68-155 is a fixed-temperature digital linear heat detection cable designed to provide continuous thermal monitoring and rapid alarm actuation across critical industrial infrastructure.

Make: System Sensor
Model: SS-LD-68-155
Alarm Activation Temperature: 68°C (155°F)
Cable Type: Digital fixed-temperature linear heat detection cable
Conductor Construction: Twisted pair of low-resistance tri-metallic cores (0.05 Ohm/ft) with heat-sensitive polymer insulation
Outer Jacket: Red polypropylene protective outer coating tested to 1 kV
Operating Voltage: Up to 30 V AC / 42 V DC
Maximum Zone Length: 3,000 meters
Minimum Bend Radius: 50 mm
Interface Requirements: Requires addressable monitor module or conventional detection zone, plus end-of-line (EOL) termination box
Operating Limits: -40°C to +121°C; 90% to 98% RH non-condensing
Standards & Listings: UL 521, FM Approved, CE Marked, RoHS Compliant

KTI07001001AHSS

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₹ 382.50 excl. GST

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Product Details
Available Brands	System Sensor
Unit	SizeUnitm
HSN Code	85311020
Warranty	12 Months Warranty
Tags/categories	Safety Fire Safety Solutions Fire Alarm System Addressable Fire Alarm System Notifier Fire Alarm System

Usually dispatched within 5 days

About this product .

The System Sensor SS-LD-68-155 linear heat detector cable is engineered with a twisted pair of low-resistance tri-metallic conductors. Each inner core is encased in an advanced heat-sensitive polymer insulation and sheathed within an extruded red polypropylene protective outer jacket tested to 1 kV breakdown voltage.
Operating on a digital thermal shorting principle, the cable activates when ambient heat along any point of its run reaches the rated activation threshold of 68°C (155°F). Upon reaching this temperature, the inner polymer melts, permitting the sprung mechanical twisted conductors to contact and establish an immediate short-circuit alarm signal.
The detection cable operates reliably at voltages up to 30 V AC and 42 V DC, maintaining an electrical conductor resistance of approximately 0.05 Ohm/ft. Supporting continuous detection runs up to 3,000 meters per zone, it ensures dependable electrical performance within an operating temperature range of -40°C to +121°C.
The cable interfaces directly with intelligent addressable fire alarm control panels using standard addressable monitor modules, or can connect to conventional fire alarm initiating circuits. Proper installation requires an end-of-line (EOL) box or resistor to deliver continuous open-circuit and short-circuit line supervision, while maintaining a strict minimum bend radius of 50 mm.
Engineered for demanding industrial fire safety applications, the SS-LD-68-155 is extensively deployed along power cable trays, cable tunnels, conveyor belts, escalators, and warehouse racking. It provides continuous proximity thermal detection across vehicular road tunnels and restricted industrial service ducts where point-type smoke detectors are impractical.
UL 521 listed and FM approved, this linear heat detection cable guarantees stringent compliance with international life safety standards. Facilities benefit from immediate, continuous area coverage, reduced false alarms from dust or airflow, and rapid alarm verification across extensive linear distances.
Because digital linear heat detection operates via thermal physical core contact, the activated section is non-restorable following a fire event. Routine maintenance entails verifying supervisory circuit continuity via the fire alarm panel, while any thermally triggered section can be quickly spliced and replaced using approved junction boxes without replacing the entire zone run.

Product Information .

Worship Places Industries, Factories Hospitals, Clinics Shopping Malls, Showrooms Government Buildings, Offices Party Plots, Gardens Banks Airports Railways, Bus Stations Conference Rooms Resorts Refineries Chemical Plants Defense Sectors Event Management Server Rooms Pharma Industries Auditorium Conference Hall Emergency Services

System Integration & Circuit Compatibility

The Honeywell System Sensor SS-LD-68-155 digital linear heat detection cable is engineered for seamless integration across industrial fire signaling networks. Operating as a normally-open circuit that activates via a short-circuit switch mechanism at 68°C (155°F), the cable provides direct electrical and hardware compatibility with both modern addressable building automation systems and legacy conventional initiating device circuits.

Fire Alarm Control Panel (FACP) Integration

The SS-LD-68-155 interfaces directly with intelligent, addressable systems and conventional fire alarm panels without requiring specialized proprietary host controllers:

Addressable Systems: Fully compatible with Notifier and System Sensor intelligent fire alarm control panels when wired through standard intelligent addressable monitor modules. The monitor module senses the switch state changes, reporting localized alarm and trouble conditions directly onto the signaling line circuit (SLC).
Conventional Systems: Compatible with conventional fire alarm control panels supporting standard normally-open dry contact initiating device circuits (IDC). When the heat-sensitive polymer melts under fire conditions, the tri-metallic cores short together to latch the conventional detection zone into an alarm state.

Supervisory and End-of-Line Requirements

Continuous circuit integrity and fault supervision require proper termination across every installed run:

End-of-Line (EOL) Termination: An approved End-of-Line (EOL) box or zone-matching termination resistor must be installed at the distal end of the detection run. This allows the host panel or monitor module to maintain continuous open-circuit and short-circuit supervision.
Fault Watch: The monitoring circuit detects opens (broken conductors or loose splices) as fault/trouble conditions, while distinguishing low-resistance short circuits (conductor contact at 68°C) as positive fire alarms.
Post-Event Servicing: Because digital linear heat cable is non-restorable at the point of thermal activation, triggered sections must be spliced out using approved junction boxes.

Electrical Circuit Parameters

Designers must adhere to the following electrical operational thresholds when calculating zone limits and circuit power allowances:

Operating Voltage: Rated for operational circuits up to 30 V AC and 42 V DC.
Conductor Resistance: The twisted pair of tri-metallic cores exhibits a low electrical resistance of approximately 0.05 Ohm/ft.
Capacitance & Inductance: Cable capacitance ranges from 88 to 150 pF/m (26 to 45 pF/ft), with an inductance rating of 540 to 1050 nH/m.
Maximum Continuous Zone Length: Supports continuous zone deployments of up to 3,000 meters (10,000 feet) per monitored loop.

Structural & Physical Compatibility

The general-purpose red polypropylene outer jacket features a 1 kV tested protective outer coat, rated for operating environments from -40°C to +121°C and relative humidity levels between 90% and 98% (non-condensing). During routing along cable trays, conveyor belts, escalators, warehouse racking, cable tunnels, and vehicular tunnels, installers must strictly maintain the minimum bend radius of 50 mm to prevent physical conductor stress or false shorting.

Compatibility Reference Table

Subsystem / Parameter	Specification / Compatibility Status
Addressable Interface	Compatible via Notifier & System Sensor intelligent monitor modules
Conventional Interface	Compatible with standard normally-open conventional zones
Supervision Hardware	EOL box / matching termination resistor required
Maximum Circuit Length	3,000 m (10,000 ft)
Operating Limits	Up to 30 V AC, 42 V DC (-40°C to +121°C)
Standards Compliance	UL 521 Listed, FM Approved, CE Marked, RoHS Compliant

System Sensor SS-LD-68-155 Installation and Wiring Guidelines

Proper deployment of the System Sensor SS-LD-68-155 digital linear heat detection (LHD) cable ensures rapid, reliable fire alerting across industrial environments such as cable trays, cable tunnels, conveyor belts, escalators, vehicular roads, tunnels, and warehouse racking. The sensor cable features a protective red polypropylene outer jacket tested to 1 kV over a twisted pair of sprung, low-resistance tri-metallic conductors insulated with a heat-sensitive polymer that activates at 68°C (155°F).

Bend Radius and Mechanical Routing

During installation and routing, field personnel must strictly maintain a minimum bend radius of 50 mm. Bending or kinking the cable tighter than the 50 mm limit exerts mechanical stress on the inner tri-metallic conductors and may crush the inner heat-sensitive polymer insulation. Such mechanical deformation can cause conductors to short prematurely, resulting in false fire alarms or trouble faults on the initiating circuit. Ensure the cable is secured along the detection run without pinching or crimping the outer red polypropylene jacket.

Zone Architecture and Module Interface

The SS-LD-68-155 cable supports a maximum zone length of up to 3,000 meters (10,000 feet). The linear heat detection circuit operates at rated voltages up to 30 V AC and 42 V DC. To integrate into a fire alarm system, the detection loop must interface with an addressable intelligent monitor module (such as a Notifier or System Sensor monitor module) for addressable fire alarm control panels (FACPs), or directly into a compatible conventional zone supporting normally-open dry contact detection.

End-of-Line (EOL) Box and Supervision

Continuous line integrity monitoring requires terminating the cable run into an End-of-Line (EOL) box fitted with the designated termination resistor matching the panel or monitor module requirements. This closed supervisory loop allows the system to differentiate between an open-circuit fault (cut or severed line), a short-circuit fault, and a true thermal alarm state triggered when ambient heat melts the polymer core at 68°C.

Critical Installation Specifications

Parameter	Installation Specification
Alarm Activation Temperature	68°C (155°F)
Minimum Bend Radius	50 mm
Maximum Detection Zone Length	3,000 m (10,000 ft)
Conductor Loop Resistance	~0.05 Ohm/ft of twisted pair
Maximum Capacitance	88 to 150 pF/m (26 to 45 pF/ft)
Inductance Range	540 to 1050 nH/m
Maximum Operating Voltage	30 V AC / 42 V DC
Operating Temperature Limits	-40°C to +121°C
Operating Humidity	90% to 98% RH (non-condensing)
Outer Sheath Material & Colour	Polypropylene, Red (1 kV tested)

Post-Activation Splicing Protocol

Digital linear heat detection cable is non-restorable at the specific point of thermal activation. Once the ambient temperature reaches 68°C, the inner polymer insulation melts permanently, allowing the twisted tri-metallic cores to contact each other. After an incident, the affected section must be identified, cut out, and replaced. Installers must splice replacement lengths of SS-LD-68-155 using approved junction boxes to restore electrical continuity and system supervision in accordance with UL 521, FM, and CE standards.

Industrial Applications and Deployment Environments

The System Sensor SS-LD-68-155 digital linear heat detection cable is engineered for early-stage thermal hazard detection across large-scale industrial, commercial, and infrastructure environments. Built with a red polypropylene jacket tested to 1 kV and housing a twisted pair of low-resistance tri-metallic conductors, the cable continuously monitors ambient conditions over runs extending up to 3,000 meters (10,000 feet) per zone. Operating across an environmental temperature range from -40°C to +121°C and relative humidity levels between 90% and 98% (non-condensing), the SS-LD-68-155 reliably signals overheat conditions at a calibrated threshold of 68°C (155°F).

Industrial Cable Trays and Underground Cable Tunnels

Electrical cable risers, horizontal cable trays, and underground utility tunnels present high-density fire risks where spot-type smoke or heat detectors are impractical due to restricted clearance, dust accumulation, or localized airflows. Installed directly along cable bundles or secured to tray rungs, the SS-LD-68-155 maintains proximity to potential points of electrical failure. When an insulation breakdown or severe electrical overload raises surrounding temperatures to 68°C, the inner heat-sensitive polymer collapses immediately, forcing the sprung conductors to short and register an alarm via an addressable intelligent monitor module or conventional fire alarm panel zone.

Bulk Material Conveyor Belts and Handling Systems

Conveyor assemblies in mining, processing facilities, and heavy industrial plants are vulnerable to continuous mechanical friction from jammed idlers, seized drive rollers, and overheated bearings. The SS-LD-68-155 can be routed along the conveyor structure, idler strings, and beneath transfer chutes. Because the cable supports a 3,000-meter maximum circuit length, long-distance handling belts can be monitored as continuous zones. Its 1 kV protective outer coat and operational endurance up to 98% non-condensing humidity allow it to perform reliably in damp, dusty production plants.

High-Density Warehouse Racking Systems

In high-bay racking and vertical storage facilities, thermal updrafts and ceiling height delay the response times of traditional ceiling-mounted spot thermal or smoke detectors. Running the SS-LD-68-155 along interior rack tiers and framework levels ensures in-rack thermal monitoring directly adjacent to combustible packaging and goods. The flexible 50 mm minimum bend radius enables installers to route the cable through tight structural racking junctions without pinching the tri-metallic cores or compromising insulation integrity.

Vehicular Roads and Transportation Tunnels

Road and vehicular transit tunnels require continuous line-type heat detection capable of withstanding vehicle exhaust, elevated particulate levels, and strong forced-air ventilation. Standard point detectors suffer from rapid contamination in these environments. The SS-LD-68-155 provides uninterrupted coverage across vehicle lanes, electrical service alcoves, and tunnel maintenance runs. Regulated under UL 521 standards with FM Approval, the cable delivers fixed-point thermal alarming under voltages up to 30 V AC or 42 V DC, paired with an End-of-Line (EOL) termination box to continuously supervise line integrity against open-circuit faults.

Public Transit Escalators and Moving Walkways

Enclosed machine compartments beneath public transit escalators and passenger conveyors contain motors, drive chains, and braking assemblies operating in confined, grease-laden areas. Installing the SS-LD-68-155 within the truss and mechanical return runs provides rapid detection of localized frictional overheating prior to open ignition. The non-restorable contact mechanism initiates immediate plant shutdown or fire protective signaling when local temperatures reach 68°C.

Application Area	Primary Risk Monitored	Key Deployment Requirement
Cable Trays & Tunnels	Insulation breakdown, electrical overheating	Maintain 50 mm minimum bend radius along tray rungs
Conveyor Belts	Bearing seizure, roller friction, belt rub	Continuous routing up to 3,000 m per detection zone
Warehouse Racking	Localized in-rack pallet combustion	Secure running lines through tiered storage levels
Road & Vehicle Tunnels	Vehicle fires, exhaust-heat entrapment	Supervised with addressable monitor module and EOL box
Escalator Trusses	Drive motor failure, friction in mechanical returns	Direct placement in enclosed mechanical compartments

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