The MJC4/2.8J catalytic combustion type combustible gas sensor is composed of a pair of detection elements and compensation elements. The two elements are platinum wire coils wrapped with catalyst and inert material respectively. The combustible gas will have a catalytic combustion reaction on the catalyst of the working element, causing the resistance of the detection element to increase, thereby changing the change of the output voltage of the bridge circuit. The change value is linearly and positively related to the concentration of the combustible gas; Catalytic combustion reaction occurs, so no resistance change occurs, and the compensation element mainly functions as a reference and compensation for ambient temperature and humidity
| Item | Parameter |
| model | MJC4/2.8J |
| Detection principle | Catalytic combustion |
| Detection gas | EX |
| Operating Voltage | 2.8V（±0.1V） |
| Working current | 100mA（±10mA） |
| Detection range | 0-100%LEL |
| Sensitivity | 20-40mV / 1%CH4 |
| Zero voltage | ±30mV |
| Resolution | 1%LEL |
| Response time | T90≤30s |
| Recovery Time | T10≤30s |
| Operating temperature/humidity range | -20 ~ +60℃ lower than95%RH |
| Storage temperature/humidity range | -20 ~ +60℃ lower than95%RH |
| Storage temperature/humidity range | ≤±5% F.S /月 |
| Sensitivity drift | ≤±5% F.S |
| service life | 2 |
| Explosion-proof certification | ExdibⅠ |
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