Spot fires fast with reliable and cost-effective Linear Heat Detection.
Signaline Linear Heat Detection (LHD) offers fast, reliable fire and overheat detection across a wide range of environments, including areas where traditional fire detectors may fail.
Why use Signaline?
Signaline offers the widest range of linear heat detection products on the market, with alarm temperatures ranging from 40°C to 230°C, a variety of outer materials for all environments and a complete set of installation accessories to suit every project.
Designed to detect fires in harsh environments, Signaline Linear Heat Detectors are not affected by atmospheric conditions. This means they can be used in any environment including Hazardous Areas, ensuring Signaline will detect any heat anywhere.
Signaline is the most approved range of Linear Heat Detectors in the world. Globally approved to EN54 part 22, EN54 Part 28, UL and FM, as well as many national fire detection standards.
Signaline Linear Heat Detection product ranges
Signaline Linear Heat Detection is available in three different ranges Signaline HD+, Signaline FT-EN and Signaline FT. Follow the links below to learn more.
Signaline HD+ Programmable Linear Heat Detection
Signaline HD+ allows you to select alarm temperatures and is a fully resettable linear heat detector that does not need replacing after an alarm activation. UL and EN54 Part 22 approved.
Signaline FT-EN Linear Heat Detection
Signaline FT-EN, approved to EN54 part 28, is fixed temperature Linear Heat Detection. Signaline FT-EN comes in 68˚C, 78˚C or 88˚C alarm temperatures and is complete with alarm location controller providing you with exact alarm location in a fire event.
Signaline FT Linear Heat Detection
Signaline FT is our fixed temperature Linear Heat Detector that is approved to UL, cUL and FM. It triggers an alarm when the cable reaches a preset temperature. Pinpoint the exact alarm location via the Signaline LocatorPlus and Signaline FT-EOL units.
Signaline HEAT clips and extras
Fixings and accessories to accompany Signaline Linear Heat Detectors ensure system integrity through high-specification materials and are engineered to streamline installation.
What is Linear Heat Detection?
Linear Heat Detection (LHD) is a fire detection system that uses a line-type sensor to detect heat.
Using a line type detector, sometimes known as heat sensing cable, and a dedicated controller, LHD systems detect temperature increases anywhere along their length and trigger alerts when a predefined threshold is reached.
With durable cable coatings suited to harsh conditions, Linear Heat Detection is often used where alternative forms of fire detection are not well suited, especially industrial applications where airflow, chemicals, or contaminants are present.
Frequently asked questions
How do I test Linear Heat Detection?
Linear Heat Detection forms part of a building’s life safety equipment and therefore regular testing is essential. Functional testing can be performed by using a suitable heating element on the line-type detection cable to simulate an alarm.
Across our ranges, Signaline Linear Heat Detection can either be directly tested using a heat source or utilising internal functionality on the controllers we offer.
Which clip should I use to secure Linear Heat Detection?
The correct choice of clip depends on the specific environment, mounting surface and local regulations in which the linear heat detection is being used.
For EN54 approved solutions the cable should always be mounted with a metal fixing clip that allows a 20mm drop from the fixing surface. This allows air-flow around the line-type heat detector and ensures quick activation in an alarm event.
Specialist clips are necessary for use in specific environments, such as floating roof tanks and cable trays.
When there is no easy mounting surface e.g. due to non-flat surfaces or apexed roofs, consider the use of a catenary wire solution.
You can review a full list of Signaline Linear Heat Detection clips.
Can I use Linear Heat Detection in the Hazardous Area?
For electrical equipment to be used within a designated Hazardous Area the items should be certified safe for use. This is normally done by encapsulating the electronics inside a Flame Proof enclosure or ensuring the power consumption is below a minimum threshold to not be an ignition risk (Intrinsically Safe).
Many Linear Heat Detectors are defined as Simple Apparatus. This means, by themselves they do not have the electrical energy to be an ignition source.
Simple Apparatus can be used within the hazardous area, and this is the case for Signaline Linear Heat Detectors.
For more information please review our guide for hazardous areas
What is the minimum and maximum zone length for Linear Heat Detection?
The minimum and maximum zone length for Linear Heat Detection will depend on the approval of the line-type heat detector and the local regulation.
En54 part 22 approved systems are limited to 500m per zone and require a minimum of 50m.
En54 part 28 approved systems are limited to 1000m per zone and have no minimum length.
UL, cUL and FM approved systems are limited to 3000m per zone and have no minimum length.
What reel lengths are available?
Signaline Linear Heat Detection cable is sold in 50 metre lengths, so the minimum order is 50 metres.
We offer reels in 50-metre steps—such as 50m, 100m, 150m, and so on—up to 500 meters for FT-EN and HD+ cables, and up to 1000 metres for FT cables.