Fixed Activation
Thermocable’s Fixed Temperature Linear Heat Detection (previously known as digital linear heat detection) provides dependable, easy-to-install fire detection for industries where conditions are too harsh for conventional spot detectors.
This two-core cable uses a temperature-sensitive polymer that melts at a predefined threshold (e.g., 68°C, 78°C, 88°C, 105°C, or 185°C), triggering an irreversible alarm. It’s perfect for high-risk, long-distance applications where rapid detection is critical – such as:
Designed with simplicity and reliability at its core. Fixed Temperature LHD activates at a pre-set temperature anywhere along the cable, offering robust protection across cable trays, tunnels, storage tanks, and other high-risk areas.
Why Choose Fixed Temperature LHD?
- Simplicity: straightforward fixed alarm temperature options for easy system design and installation
- Reliability: trusted technology proven in the most challenging environments since 1968
- Durability: resistant to chemicals, UV, and mechanical stress with the different material options, ensuring long term performance
- Versatility: wide range of cable jackets and alarm temperatures to suit a multitude of applications
ProReact Fixed Activation
Preset alarm temps. Tough cable. Reliable fire safety.
- UL and FM approved
- CE, RoHS, and UKCA certified
- PVC, Nylon or Stainless Steel Braided
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ProReact Fixed Activation (EN)
Preset alarm temps. Tough cable. Reliable fire safety.
- EN and FM approved
- CE, RoHS, and UKCA certified
- PVC, Nylon or Stainless Steel Braided
ProReact Fixed Plus
Extra-tough heat detection for extreme environments – even down to -60°C.
- UL and FM approved
- CE, RoHS, and UKCA certified
- LSZH coating, UV stability, and hydrocarbon resistance
- Optional stainless steel braiding for mechanical protection
ProReact Very High Temperature (VHT)
Extreme heat? ProReact VHT delivers reliable protection, with activation at 230°C.
- UL and FM approved
- Continuous operation up to 170°C
- Optional stainless steel braiding for mechanical protection
Product Selector
Simply tick the features you need—such as temperature range, approvals, or environment—and get instant product recommendations.
Applications Across Critical Sectors
Fixed LHD is engineered for industries where reliability and robustness matter most:
- Industrial
protects machinery, conveyor systems, and transformer bays with dependable detection that minimises downtime - Infrastructure
ideal for tunnels, car parks, and cable trays, where long runs demand continuous coverage and harsh conditions make spot detectors impractical - Oil & Gas
proven performance in hazardous areas such as refineries, storage tanks, and offshore facilities, where downtime and safety risks are unacceptable - Energy & Renewables
localised overheating risks in solar farms and battery energy storage systems (BESS) - Warehousing & Cold Storage
reliable detection across large storage areas and chilled environments, with fixed alarm temperatures that cut through dust, condensation, and low ambient conditions.
Built for Distributors, Specifiers, and Operators
- For distributors, it’s a clear differentiator in the market: resettable, programmable, and internationally approved. Easy to explain, easy to sell
- For fire safety engineers, it’s a product that adds to their portfolio, which integrates seamlessly into complex fire detection systems
- For facility managers, it’s dependable coverage that keeps operations running without costly false alarms or downtime.
Experience You Can Trust
As an original manufacturer of linear heat detection cable, Thermocable has set the standard for fire detection innovation since 1968.
Our products are designed and manufactured in the UK, rigorously tested, and deployed in critical infrastructure worldwide. Every metre of cable is backed by technical expertise, global approvals, and a proven record of protecting people, assets, and operations.
Partner with Thermocable
Thermocable works closely with distributors, system integrators, and end-users to deliver reliable fire detection solutions tailored to the real-world challenges of modern industries.
Download Fixed Temperature Data Sheet
(PDF, 600 KB)