The AS8900 four‑in‑one gas detector manual provides operation, calibration, alarm setup, battery care, and safety information.
This manual explains how to operate the AS8900 four‑in‑one gas detector, which measures oxygen, hydrogen sulfide, carbon monoxide and combustible gases. It covers the instrument’s display, measurement modes, and step‑by‑step procedures for calibration and alarm configuration.
The document also details battery charging, maintenance, safety warnings, and warranty terms, as well as specifications for the optional AS8930 sampling pump. Users are instructed to follow the safety password procedures before making any setting changes. This manual is written in Chinese.
| Operating temperature range | -10 °C to 50 °C |
|---|---|
| Battery runtime (with pump) | up to 12 hours |
| Battery charging time | ≈6 hours |
| Dimensions (W×H×D) | 120.20 mm × 64.50 mm × 38.30 mm |
| CO detection range | 0 ~ 999 ppm |
| H₂S detection range | 0 ~ 500 ppm |
| O₂ detection range | 0 ~ 0.1 % |
| LEL (combustible gas) range | 1 % ~ 30 % VOL |
| Sampling pump flow rate | 0.5 SCFH (0.25 LPM) |
The battery reaches full charge after about six hours of charging.