The AT-B02 Conventional Reflective Beam Smoke Detector is designed to provide economical smoke detection in large open areas where point-type detectors are difficult to install and maintain. Using an infrared transmitter and a reflective target, the detector constantly monitors the returned signal. When smoke from a fire obscures the beam and the attenuation exceeds a preset threshold, the unit generates a fire alarm and drives its fire relay output.
AT-B02 adopts a single-ended reflective design, so only the detector head is wired; the reflector is passive. This greatly reduces installation cost compared with projected beam pairs. A built-in laser beam pointer and digital display guide simplify optical alignment and commissioning, helping installers quickly set the correct beam direction and signal level.
A microprocessor provides drift compensation and self-diagnostics, automatically adjusting for slow changes such as dust accumulation and lens contamination. Selectable beam spans (8–20 m, 20–40 m, 40–70 m, 70–100 m) and sensitivity levels (2.6 dB / 3.4 dB / 4.8 dB) allow the detector to be tuned for different site conditions. Fire and fault conditions are indicated locally by LEDs and exported via normally open relay outputs, allowing easy integration with conventional fire alarm control panels.
Conventional reflective infrared beam smoke detector
Single-ended design with retro-reflector – only the detector is wired
Complies with EN54-12 (beam smoke detector), supports BS 5839 Part 1:2002 system design
Built-in laser beam pointer and digital display guide for quick and accurate alignment
Selectable beam path spans: 8–20 m, 20–40 m, 40–70 m, 70–100 m
Selectable sensitivity: 2.6 dB / 3.4 dB / 4.8 dB to suit different site conditions
Microprocessor control with drift compensation and self-diagnosis
Separate fire and fault relay outputs (N/O, 2.0 A @ 30 VDC)
Clear LED indications: Red – Fire; Yellow – Fault; Green – Alignment
| Item | Specification |
|---|---|
| Model | AT-B02 Conventional Reflective Beam Smoke Detector |
| Compliance / Standard | EN54-12; BS 5839 Part 1:2002 |
| Material / Colour | ABS / White |
| Dimensions | 190.87 (L) × 126.87 (W) × 91.96 (H) mm |
| Weight | Approx. 440 g (device) |
| Item | Specification |
|---|---|
| Operating Voltage | 20–28 VDC |
| Current – Standby | 23 mA |
| Current – Commission | 40 μA |
| Current – Alarm | 33 mA |
| Item | Specification |
|---|---|
| Sensitivity Levels | Level 1: 2.6 dB (High); Level 2: 3.4 dB (Medium); Level 3: 4.8 dB (Low) |
| Beam Path Length (Span) | Span 1: 8–20 m; Span 2: 20–40 m; Span 3: 40–70 m; Span 4: 70–100 m |
| Reflector Requirement | 8–40 m: 1 reflector; 40–100 m: 4 reflectors |
| Beam Path Angle | ±0.5° (directional) |
| Item | Specification |
|---|---|
| Alignment Guide | Laser beam pointer + digital display guide (nixie tube) |
| LED Indicators | Red: Fire; Yellow: Fault; Green: Alignment |
| Reset Time | < 2 s |
| Item | Specification |
|---|---|
| Fire Relay Output | Normally Open, 2.0 A @ 30 VDC |
| Fault Relay Output | Normally Open, 2.0 A @ 30 VDC |
| Item | Specification |
|---|---|
| Operating Temperature | -10°C to +55°C |
| IP Rating | IP30 (IP66 with glue seal) |
| Humidity | 0–95% RH, non-condensing |
Warehouses and large storage areas
Shopping malls, leisure centres and exhibition halls
Hotel lobbies and other high-ceiling public spaces
Printing houses and garment factories
Museums and similar wide-span buildings
