The S74ECO carbon monoxide gas sensor is a constant-potential four-electrode electrolytic sensor. Carbon monoxide and oxygen undergo corresponding redox reactions at the working and counter electrodes, respectively, releasing charges and forming a current. The magnitude of the generated current is proportional to the CO concentration; by measuring the current magnitude, the carbon monoxide concentration can be determined. 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 | S74ECO-20 |
| Detection principle | Electrochemical four electrodes |
| Detection gas | CO |
| Detection range | 0-20PPM |
| Maximum load concentration | 50PPM |
| Sensitivity | 375±125nA/PPM |
| Resolution | 10ppb |
| Response time | ＜30s |
| 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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