The AT-S202 Photoelectric Smoke Detector is engineered for early and reliable fire detection in modern building safety systems. Powered by an intelligent CPU and A/D algorithm, it continuously monitors the environment and accurately analyzes smoke signals to minimize false alarms.
Its advanced back-scatter smoke sensing chamber ensures balanced sensitivity to both black and white smoke types. The unit integrates automatic dust compensation, improving long-term stability and reducing maintenance frequency.
The AT-S202 features non-polar 2-wire terminals, allowing fast installation and simplified wiring. The LED indicator flashes under normal monitoring and remains steady during fire alarm activation, providing clear visual status.
Widely used in commercial and industrial environments such as offices, conference rooms, hotels, parking garages, warehouses, and public buildings, this detector ensures early-warning fire safety and reliable system performance.
Intelligent CPU smoke analysis algorithm
Photoelectric back-scatter sensing chamber
Automatic dust compensation technology
Non-polar wiring for easy installation
LED status indication (flash/steady)
Stable performance, long-life design
| Item | Specification |
|---|---|
| Operating Voltage | DC 20V — 28V |
| Standby Current | < 200µA |
| Alarm Current | ≤ 24mA |
| Dimensions | Ø96 × H38mm (no base) / Ø96 × H49mm (with base) |
| Operating Temp | −10°C to +55°C |
| Humidity | ≤95%RH (non-condensing) |
| Mounting Method | Ceiling mount — rotary base lock |
| Wiring | Non-polar terminals (L1/L2) / Optional 5.1kΩ EOL resistor |
✔ Commercial buildings & hotels
✔ Conference rooms & offices
✔ Parking garages & basements
✔ Schools, hospitals & public areas
✔ Warehouses & industrial facilitiesb
