The S4-NO2 nitrogen dioxide gas detection sensor is a constant potential electrolytic sensor. The corresponding redox reaction between nitrogen dioxide and oxygen takes place on the working electrode and the counter electrode and releases the charge to form a current. The generated current is proportional to the concentration of nitrogen dioxide. The concentration of nitrogen dioxide can be determined by the size of the test current.
| Item | Parameter |
| Model | S4-NO2 |
| Detection principle | Electrochemical 3 electrodes |
| Detection gas | NO2 |
| Detection range | 0-20PPM |
| Maximum load concentration | 200PPM |
| Output signal | -600±150nA/PPM |
| Zero drift | 0~1PPM |
| Resolution | 0.1PPM |
| Response time | <30s |
| Bias voltage | 0 |
| Load resistance | 5~30Ω |
| Working Temperature | -30℃-50℃ |
| Working Humidity | 15%RH to 90%RH（no condensation） |
| Repeatability | ＜±2% output signal |
| Long-term stability | ＜2% signal/month |
| Linearity | 100PPM |
| Work pressure | 90 to 110 kPa |
| Shelf life | 12 months after delivery |
| Service life | 2 years |
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