SMH2 hydrogen gas detection sensor is a kind of 3 electrodes electrochemical sensor. Hydrogen is oxidized on working electrode and oxygen is reduced on the counter electrode. The reference electrode contacts with the electrolyte to keep working electrode at a stable potential. The redox reaction current is directly proportional to the concentration of hydrogen.
| Item | Parameter |
| Model number | SMH2-1000 |
| Detection principle | Electrochemical three electrodes |
| Detection gas | H2 |
| Detection range | 0~1000ppm |
| Maximum load concentration | 2000PPM |
| Output Signal | 10±5nA/PPM |
| Zero Drift | ±6PPM |
| Resolution | ＜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% output signal |
| Long-term stability | ＜2% signal/month |
| Linearity | Linear |
| Work pressure | 90 to 110 kPa |
| Shelf life | 12 months after delivery |
| Service life | 2 years |
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