S4-CH2O is a constant potential electrolytic sensor. Formaldehyde and oxygen have corresponding oxidation-reduction reaction on the working electrode and the counter electrode respectively and release charge to form current. The generated current is proportional to the formaldehyde concentration. The formaldehyde concentration can be determined by measuring the current.
| Item | Parameters |
| model | S4-CH2O |
| Detection principle | ELectrochemical Three Electrodes |
| Detection gas | CH2O |
| Detection range | 0-10PPM |
| Maximum load concentration | 50PPM |
| Sensitivity (20 ℃) | 0.55 ± 0.15 μA/ppm |
| Zero drift（-20℃-50℃） | < 1 ppm |
| Resolution | 0.1PPM |
| Response time | ≤90s |
| Bias voltage | 0mV |
| Working Temperature | -20℃-50℃ |
| Working Humidity | 15%RH to 90%RH（no condensation） |
| Long-term stability | ＜2% signal/month |
| Linearity | to 200PPM |
| Work pressure | 90 to 110 kPa |
| Shelf life | 12 months after delivery |
| Service life | 2 years |
（To make sure that we provide you suitable model,could you share your contact information?Thanks!）
