SFD-860 series bus-type combustible/toxic gas alarm device, widely used in various places prone to dangerous gas leakage in high temperature areas, can monitor these places for a long time, once the surrounding combustible gas exceeds the standard leakage, the combustible gas detector installed in the explosion-proof scene will immediately send the detection signal through the transmission cable to the sound and light alarm device, when the gas concentration reaches the set alarm point, the sound and light alarm device will immediately send out the sound and light alarm signal to prevent fire, explosion and other incidents.
The Suofuda SFD-860 series provides bus‑type combustible/ toxic gas alarm controllers (4, 8 or 16 channels) that work with SFD-600 series field detectors. The system monitors hazardous gases, triggers audible/visual alarms, and supports RS485 Modbus communication.
The manual details product selection, specifications, wiring diagrams, installation steps, detector calibration, routine maintenance, and troubleshooting procedures for safe operation in explosive environments. This manual is written in Chinese.
| Low alarm limit | 25% of full scale (non‑adjustable) |
|---|---|
| High alarm limit | 50% of full scale (non‑adjustable) |
| Response time | 15 s |
| Recovery time | 30 s |
| Power supply | DC 24 V (DC 12 V‑DC 28 V) |
| Weight per channel | ≈ 3 kg |
| Operating temperature range | -40 °C to +70 °C |
| Relative humidity range | < 95 % RH |
| Communication interface | RS485 Modbus |
The controller responds within 15 seconds when gas concentration exceeds the alarm limit.
It operates from a DC 24 V supply, acceptable range DC 12 V to DC 28 V.
Calibration checks should be performed regularly, at least monthly, and after the sensor exceeds its service life.
Shielded twisted‑pair cable must be used, especially for distances over 1000 m or in high‑interference environments.