The SMNO2 nitrogen dioxide gas detection sensor is a constant potential electrolytic sensor. Nitrogen dioxide and oxygen undergo corresponding redox reactions on the working electrode and counter electrode, respectively, releasing charges and forming a current. The magnitude of the current is directly proportional to the nitrogen dioxide concentration. By measuring the current magnitude, the nitrogen dioxide concentration can be determined.
| Item | Parameter |
| Model number | SMNO2-20 |
| Detection principle | Electrochemical three electrodes |
| Detection gas | NO2 |
| Detection range | 0-20PPM |
| Maximum load concentration | 50PPM |
| Sensitivity | 120±35nA/PPM |
| Zero Drift | ±0.5PPM |
| Resolution | 0.1PPM |
| Response time | ＜30s |
| Bias | 0 |
| Load resistance | 5~30Ω |
| Temperature range | -30℃-50℃ |
| Humidity range | 15%RH to 90%RH (no condensation) |
| Repeatability | ＜±2% |
| Long-term stability | ＜2% signal/year |
| Linearity | Linearity |
| Work pressure | 90 to 110 kPa |
| Shelf life | 12 months after delivery |
| Service life | 2 years |
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