The SFD-800II intelligent total‑line gas alarm system consists of a SFD-800 controller and up to 32 SFD-600B detectors. The system is designed for hazardous areas and complies with GB3836‑1, GB3836‑2, GB16808, and GB15322 standards. It uses a three‑wire bus (one signal line and two DC power lines) to connect the controller and detectors.
The manual describes the controller’s menu‑driven LCD interface, the functions of the seven panel keys, and the procedures for system setup, probe testing, calibration, shielding, and programming. It also lists technical specifications such as alarm limits, response times, power requirements, environmental ranges, and safety ratings. This manual is written in Chinese.
| Maximum detectors managed | 32 detectors |
|---|---|
| Bus wiring | 3‑wire bus (signal + two DC lines DC24V, 0V) |
| Alarm low limit | 20% LEL (adjustable) |
| Alarm high limit | 50% LEL (adjustable) |
| Response time (combustible gases) | <15 seconds |
| Response time (toxic gases) | <60 seconds |
| Explosion protection | Ex d IIC T6, IP65 |
| Relay output rating | AC220V / 10A per contact |
| Operating temperature (controller) | 0 °C to +70 °C |
| Operating temperature (detector) | -20 °C to +50 °C |
| Operating humidity | 15 % to 95 % RH |
| Minimum cable diameter | 6 mm |
The controller can manage up to 32 detectors.
The low alarm limit is settable to 20% LEL and the high limit to 50% LEL.
The bus uses a three‑wire connection with a DC24 V line and a 0 V line.
Combustible gases are detected in less than 15 seconds, and toxic gases in less than 60 seconds.