The S74EH2S hydrogen sulfide gas sensor is a constant-potential four-electrode electrolytic sensor. Hydrogen sulfide and oxygen undergo corresponding redox reactions at the working electrode and counter electrode, respectively, releasing charges and forming a current. The magnitude of the current is directly proportional to the H2S concentration. The concentration of hydrogen sulfide 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 | S74EH2S-100 |
| Detection principle | Electrochemical four electrodes |
| Detection gas | H2S |
| Detection range | 0-100PPM |
| Maximum load concentration | 200PPM |
| Sensitivity | 2.0±0.6uA/ppm |
| Resolution | 10ppb |
| Response time | ＜60s |
| Load resistance | 10Ω |
| Temperature range | -30℃-50℃ |
| Humidity range | 15%RH to 90%RH (no condensation) |
| Repeatability | 2% 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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