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Fire Alarm Detectors

Detectors sense a fire and trigger the panel. This range from ESP and Mercury covers optical smoke, heat, thermal and beam types, including a beam detector with a 50m range for large open spaces. MagPro addressable, MAGfire conventional and MagDuo two-wire models suit different panels, while the sealed-battery Mercury smoke and heat alarms run standalone. Some MagDuo units build a sounder and strobe into the detector itself.

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What a detector does

A detector senses the early signs of a fire and triggers the panel so the alarm can be raised. Different fires show themselves in different ways, through smoke, heat or a beam of light being broken, so the right detector for a space depends on what it is watching for and the kind of room it sits in.

Detector types in this range

This range covers optical smoke, heat, thermal and beam detectors. Optical smoke units watch for the smoke a fire gives off, while heat and thermal units respond to rising temperature, which suits places where smoke detection would give false alarms such as kitchens or dusty areas. A beam detector with a 50m range covers large open spaces from wall to wall, where ceiling-mounted units would be impractical.

Matching detectors to panels

Detectors are made to suit the panel they connect to. Addressable, conventional and two-wire models are all included, so you can match a detector to the type of system already in place. Some two-wire units build a sounder and strobe into the detector body itself, combining detection and alert in a single fitting where wall space or cabling is tight.

Standalone alarms

Alongside the panel-connected detectors, sealed-battery smoke and heat alarms run on their own. The sealed-battery units carry a 10 year sealed battery, so they work as standalone protection without wiring back to a panel, which suits rooms or smaller premises where a full system is not in place.

How to choose

First match the detector to your panel, whether addressable, conventional or two-wire, then pick the sensing type for each room: smoke for general areas, heat or thermal where smoke would mislead, and a beam unit for large open volumes. For standalone cover, choose the sealed-battery alarms. Free UK delivery over £99, worldwide shipping.

Frequently Asked Questions

What is the difference between a smoke and a heat detector?
A smoke detector watches for the smoke a fire gives off, while a heat or thermal detector responds to rising temperature. Heat types suit kitchens and dusty areas where smoke detection would cause false alarms.

What is a beam detector for?
It covers large open spaces by sensing when a beam of light across the area is broken. The unit in this range has a 50m range, which suits halls and warehouses where ceiling-mounted detectors would be impractical.

How do I know which detector suits my panel?
Detectors are made to match the system they connect to. This range includes addressable, conventional and two-wire models, so you choose the type that fits the panel already in place.

What is a sealed-battery alarm?
A standalone smoke or heat alarm that runs on its own battery rather than wiring back to a panel. These units carry a 10 year sealed battery.

Can a detector also sound the alarm?
Yes. Some two-wire units build a sounder and strobe into the detector body, combining detection and alert in a single fitting where space or cabling is tight.

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