The manual provides installation, operation, calibration, alarm handling, and maintenance instructions for the JKB-O4Bd combustible gas detector.
The JKB-O4Bd is a line‑type combustible gas detector with digital concentration display and explosion‑proof rating Ex d IIC T6, suitable for hazardous Zone 1 and Zone 2 environments such as city gas, petrochemical plants, and gas pipelines. It offers stable operation, high sensitivity, and easy handling.
This user manual covers quick operation, technical specifications, installation and wiring, parameter settings, zeroing and calibration, upper/lower limit adjustments, alarm indications, common fault troubleshooting, replaceable parts, safety precautions, and warranty information. This manual is written in Chinese.
| Detection principle | Catalytic combustion |
|---|---|
| Sampling method | Diffusion |
| Measurement range | 0~100% LEL |
| Response time | ≤30 s |
| Working voltage | DC 18‑30 V |
| Output signal | 4‑20 mA |
| Temperature range | -40 °C to 70 °C |
| Humidity range | 0‑95 % RH |
| Explosion rating | Ex d IIC T6 |
| Connection thread | G3/4 pipe thread |
| Dimensions (mm) | 210×155×108 |
| Weight | 1.75 kg (no accessories) |
| External load | <500 Ω |
The detector operates on a DC supply of 18 V to 30 V.