FDOOT241-CN composite smoke and temperature detector is a multi-sensor fire detector, which combines Siemens' many years of industry experience with the careful design of the smoke chamber, with 2 emitters, 1 receiver (photodiode) and 2 temperature sensors. Two light emitters illuminate smoke particles from different angles, and the scattered light is received to produce a measurable electrical signal. The forward scattering element and the rear scattering element are used together to ensure that the detector is in the best detection state, accurately distinguish between fire-generated smoke particles, and better distinguish between fire alarm signals and false fire signals. In addition, the temperature sensor can detect smoke without fire.
The FDOOT241-CN is a multi‑sensor fire detector that combines smoke and temperature sensing to provide early fire detection, even in smoke‑free fire scenarios. It uses dual optical paths and two temperature sensors to distinguish real fire signals from false alarms.
The manual covers functional description, installation options (surface‑mount or concealed), wiring diagrams, performance parameters, and recommended maintenance procedures, including yearly visual checks and replacement after 6‑8 years of service. This manual is written in Chinese.
| Working voltage | 12‑33 VDC |
|---|---|
| Static working current | 200‑280 µA |
| Operating temperature range | -25 °C to +70 °C |
| Storage temperature range | -30 °C to +75 °C |
| Maximum relative humidity | ≤95 % RH |
| Communication protocol | FDnet |
| Color | White (RAL 9010) |
| Protection rating | IP43 / IP44 |
| Wind resistance | 1‑20 m/s |
| Detector weight | 0.106 kg |
The manual advises replacing detectors that have been in service for 6 to 8 years, regardless of the environment.
The detector communicates using the FDnet protocol.
The detector operates on a voltage range of 12 to 33 VDC.