The SMH2S hydrogen sulfide gas detection sensor is a constant potential electrolytic sensor. Hydrogen sulfide 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 hydrogen sulfide concentration, and the concentration of hydrogen sulfide can be determined by measuring the current magnitude.
| Item | Parameter |
| Model number | SMH2S-100 |
| Detection principle | Electrochemical three electrodes |
| Detection gas | H2S |
| Detection range | 0~100ppm |
| Maximum load concentration | 200PPM |
| Output Signal | 145±25nA/PPM |
| Zero Drift | ±2PPM |
| Resolution | 0.5PPM |
| Response time | ＜30s |
| Bias Voltage | 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/month |
| Linearity | Linearity,The regression coefficient R² = 0.999 |
| Work pressure | 90 to 110 kPa |
| Shelf life | 12 months after delivery |
| Service life | 2 years |
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