Ajax EN54 FireProtect (Heat/Smoke) Jeweller – Wireless Heat Detector

The Ajax EN54 FireProtect (Heat/Smoke) Jeweller is an advanced wireless fire detector designed to provide reliable early warning of smoke and dangerous temperature rises. Engineered for professional installations, it combines dual-spectrum optical smoke detection with highly accurate thermistors to identify both smouldering fires and rapid temperature increases, ensuring comprehensive fire protection in residential, commercial, and light industrial environments.

Utilising Ajax's proprietary Jeweller communication technology, the detector delivers secure two-way wireless communication with a transmission range of up to 1,700 metres in open space. Dynamic key encryption, frequency hopping, and device authentication provide robust protection against interference, spoofing, and sabotage, while instant event notifications and remote configuration through Ajax apps simplify system management.

The FireProtect detector features a patented smoke chamber that protects the optical sensor from dust, dirt, and insects, reducing the likelihood of false alarms and ensuring long-term reliability. The dual-spectrum optical sensor accurately detects smoke particles while remaining immune to water vapour, minimising nuisance activations.

Temperature monitoring is performed by two thermistors and supports multiple heat sensor modes, including EN 54-compliant A1R, A1S, BR, and BS settings, allowing installers to tailor operation according to the protected environment. Connection loss is detected in as little as 36 seconds, providing prompt notification of communication failures.

Designed for ease of installation and maintenance, the detector includes the SmartBracket mounting panel, allowing the unit to be rotated up to 90° after installation. Integrated tamper protection and a locking mechanism help prevent unauthorised removal. Powered by two pre-installed CR123A lithium batteries, the device offers up to six years of battery life and supports tool-free battery replacement with reverse polarity protection.

Finished in black, the Ajax EN54 FireProtect (Heat/Smoke) Jeweller is suitable for indoor applications and delivers dependable fire detection performance in a compact and discreet enclosure.

Key Features

• Combined smoke and heat detection for comprehensive fire protection.

• Dual-spectrum optical sensor with resistance to false alarms caused by water vapour.

• Two thermistors for accurate dangerous temperature detection.

• EN 54-5 compliant heat detection modes: A1R, A1S, BR and BS.

• Proprietary Ajax Jeweller wireless communication technology.

• Up to 1,700 m wireless communication range in open space.

• Secure two-way communication with dynamic key encryption.

• Frequency hopping and device authentication for enhanced protection against interference and spoofing.

• Patented smoke chamber resistant to dust, dirt, and insects.

• Instant alarm notifications and remote management via Ajax apps.

• Tamper protection and SmartBracket locking mechanism.

• Connection loss detection from 36 seconds.

• Powered by two CR123A lithium batteries with up to 6 years of operation.

• Tool-free battery replacement with reverse polarity protection.

• Indoor use.

• Black finish.

• Model: 155887.

Technical Specifications

• Detection Type: Smoke and Heat

• Communication Technology: Ajax Jeweller

• Radio Range: Up to 1,700 m (open space)

• Radio Modulation: GFSK

• Frequency Bands: Region dependent

• Maximum ERP: Up to 20 mW

• Smoke Sensor: Dual-spectrum optical sensor

• Heat Sensor: 2 × Thermistors

• Battery Type: 2 × CR123A, 3 V lithium batteries

• Battery Life: Up to 6 years

• Dimensions: 124 × 124 × 48 mm

• Weight: 278 g

• Operating Temperature: 0 °C to +50 °C

• Humidity: Up to 80%

• Protection Rating: IP20

• Flammability Rating: UL 94 V-0

• Colour: Black