The S74ENO2 nitrogen dioxide gas sensor is a constant-potential four-electrode electrolytic sensor. Nitrogen dioxide and oxygen undergo corresponding redox reactions on the working and counter electrodes, respectively, releasing charges and generating current. The magnitude of the current is proportional to the NO2 concentration, and the nitrogen dioxide concentration can be determined by measuring the current magnitude. An auxiliary electrode is introduced to compensate for the zero-point current, and a compensation algorithm is used to improve the accuracy of low-concentration gas measurements.
| Item | Parameter |
| Model number | S74ENO2-1 |
| Detection principle | Electrochemical four electrodes |
| Detection gas | NO2 |
| Detection range | 0~1ppm |
| Maximum load concentration | 5PPM |
| Sensitivity | -550±250nA/ppm |
| Resolution | 5ppb |
| Response time | ＜60s |
| Load resistance | 10Ω |
| Temperature range | -30℃-50℃ |
| Humidity range | 15%RH to 90%RH (no condensation) |
| Repeatability | 5% output signal |
| Long-term stability | ＜±2% signal/month |
| Work pressure | 90 to 110 kPa |
| Shelf life | 12 months after delivery |
| Service life | 2 years |
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