The AT-LH Series Digital Linear Heat Detector provides continuous heat detection along its entire length. When any point on the cable reaches its rated alarm temperature, the conductors short and the AT-LHMI interface module sends a fire signal to a 24 VDC fire alarm control panel.
The system offers different cable constructions for indoor, outdoor and hazardous areas, with simple two-core wiring, no on-site calibration and fast installation. It is ideal for applications where traditional point heat detectors cannot provide economical coverage or are difficult to access for maintenance.
Fixed-temperature digital linear heat detector system
UL Listed cable ratings: 68°C, 88°C, 105°C, 138°C
180°C high-temperature cable available (non-UL)
Continuous full-length heat sensing – no blind spots
Self-compensating design, no field calibration required
Cable types: Standard (indoor), CR/OD (outdoor/corrosive), EP (shielded for hazardous/EMI areas)
AT-LHMI 24 VDC interface module with alarm/fault outputs
Compatible with most conventional fire alarm control panels
Linear Heat Sensing Cable
Rated alarm temperatures: 68°C, 88°C, 105°C, 138°C, 180°C
Conductor: galvanized steel, twisted pair
Outer jacket options: PVC (standard), fluoropolymer (CR/OD), PVC with stainless steel braid (EP)
Typical applications: cable trays, conveyor belts, tunnels, tank farms, process equipment
Interface Module – AT-LHMI
Supply: 24 VDC (typical fire alarm system)
Outputs: fire alarm & fault outputs to FACP / input module
Enclosure: industrial housing, suitable for harsh sites
Power plant and substation cable trays and tunnels
Conveyor systems in mines, cement and coal facilities
Road / rail tunnels and underground service corridors
Petrochemical and tank farm rim seal protection
Warehouses and industrial plants with long equipment lines
