119922.275.BL1 # 119922 | Ajax EN54 FireProtect (Smoke) Jeweller is a black detector. These wireless rate-of-rise devices, certified according to EN54 standards, are designed to accurately detect smoke and heat in residential, commercial and industrial environments. Thanks to dual-spectrum optical sensors and high-precision thermistors, they distinguish smoke from steam and detect fires with rapid temperature changes. They offer secure radio communication up to 1,700 m, battery life of up to 5 years and integrated acoustic signaling. The patented detection chamber is resistant to dust, insects and dirt, minimizing maintenance. Simple installation via the SmartBracket panel and full management via the Ajax app. Ideal for projects of any size, they guarantee reliability and continuous protection.
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119922.275.BL1 | WIRELESS SMOKE DETECTOR

The Ajax EN54 FireProtect(Smoke) Jeweler, 119922.275.BL1 , is a wireless detector certified to EN54 standards, designed for fast and accurate detection of smoke and heat. Thanks to dual-spectrum optical sensors and built-in thermistors, they distinguish smoke from steam and detect fires with temperature variations. They offer secure radio communication up to 1,700 m, battery life of up to 5 years, and built-in acoustic signaling. The patented detection chamber is resistant to dust, insects, and dirt, reducing maintenance. Simple installation with the SmartBracket panel and full management via the Ajax app.
Main specifications:
- Dual-spectrum optical sensors and high-precision thermistors
- Radio communication up to 1,700 m
- Battery life up to 5 years
- Dust and insect resistant detection chamber
- Integrated acoustic signalling
- EN54 certified for professional use
Further details
Technical data sheet
119922.275.BL1 |
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Capacity | |
Communication | |
Jeweler communication technology | Proprietary wireless communication technology to transmit commands, alarms, and events. Key features:
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Frequency bands | 866.0–866.5 MHz 868.0–868.6 MHz 868.7–869.2 MHz 905.0–926.5 MHz 915.85–926.5 MHz 921.0–922.0 MHz Depends on the sales region. |
Maximum effective radiated power (ERP) | up to 20 mW Automatic power control to reduce power consumption and radio interference. |
Radio signal modulation | GFSK |
Radio communication range | up to 1,700 m up to 5,550 ft Between the CIE and connected devices (in an open space). Maximum range depends on the connected device. |
Encrypted communication | All stored and transmitted data are protected by block encryption featuring a dynamic key. |
Frequency hopping | To prevent radio interference and jamming. |
Smoke detection | |
Sensitive element | dual-spectrum optical sensor Detects smoke based on the size of particles in the air. |
False alarm protection | The device does not respond to water vapor. |
Patented smoke chamber | Protects the smoke sensor from dust, dirt, and insects. |
Additional features | |
LED indication | red yellow green For indicating detector states: fire alarm, functionality testing, etc. |
Installation recommendations | The device is designed for indoor use only. The SmartBracket mounting panel allows the detector to be rotated up to 90° even after installation. |
Sabotage protection | |
Tamper button | Fault notification when an attempt is made to remove the device from the mounting panel. |
Lock for SmartBracket | to secure the device on the SmartBracket mounting panel When locked, the lock secures the device and prevents it from being removed without a special tool. |
Protection against spoofing | device authentication |
Connection loss detection | after 36 s Detection time depends on Jeweler settings |
Power supply | |
Battery | 2 × CR123A Pre-installed |
Tool-free battery replacement | To replace the batteries, open the lids of the battery compartments. |
Reverse polarity protection | Prevents device damage if the batteries are put in incorrectly. |
Recommended battery type | Huiderui CR123A; 3V; 1,600 mAh, LiMnO₂ |
Calculated battery life | up to 6 years |
Enclosure | |
Dimensions | 124 × 124 × 48 mm 4.87" × 4.87" × 1.90" |
Weight | 281 g 9.91 oz |
Operating temperature range | from 0 °C to +50 °C from 32 °F to 122 °F |
Operating humidity | up to 80% |
Protection class | IP20 |
Flammability rating | UL 94 V-0 |
Color | Black |
Complete set | EN54 FireProtect (Smoke) Jeweller SmartBracket mounting panel 2 × CR123A battery (pre-installed) Quick start guide |
Warranty | 24 months |