JKB-R2Bd is a combustible gas detector and alarm that can be used to detect CH4, C3H8 and other combustible gases. The working principle is catalytic combustion. The detector converts the combustion gas concentration at the monitoring point into an electric voltage signal, then converts it into a digital signal, and transmits it to the controller via the bus. The controller calculates, analyzes, and displays the combustible gas concentration at the monitoring point and the working status of the detector. When the detector's sensor element is short-circuited or open-circuited, the detector can send a fault signal to the controller.
This manual describes the technical specifications and working principle of the JKB-R2Bd combustible gas detector, including detection gases, alarm settings, measurement range, response times, communication method, and environmental limits. It also outlines the explosion‑proof classification and physical dimensions of the device.
Installation, commissioning, and operation procedures are detailed, with wiring diagrams, calibration steps, storage recommendations, maintenance intervals, and common fault analysis. Warranty terms and service conditions are provided at the end of the document. This manual is written in Chinese.
| Detection gas | Combustible gas |
|---|---|
| Detection principle | Catalytic combustion |
| CH4 alarm upper limit | 50% LEL |
| CH4 alarm lower limit | 25% LEL |
| C3H8 alarm upper limit | 50% LEL |
| C3H8 alarm lower limit | 2.5% LEL |
| Measurement range | 0–75% LEL |
| Response time | <30 s |
| Recovery time | <30 s |
| Communication | RS‑485 bus |
| Operating temperature | -40 °C to 70 °C |
| Humidity range | 0–95 % RH |
| Operating voltage | DC 18 V–36 V |
| Dimensions | 187 mm × 107 mm × 65 mm |
| Weight | 850 g |
| Storage temperature | -25 °C to 55 °C |
| Storage humidity | <95 % RH |
| Sensor service life | 5 years |
The manufacturer provides a one‑year free warranty for the detector.
Store it at temperatures between –25 °C and 55 °C with humidity below 95 % RH; if stored below 0 °C, bring it to room temperature for at least 2 hours before powering on.