Product Description
This 4-electrode sensor is designed for air quality monitoring to measure the low-concentration SO2 gas with ultra-high resolutions. The design optimizes the sensor sensitivity, accuracy and long-term stability and enables the sensor to detect ozone variations at parts per billion (ppb) levels.
Performance Characteristics
| Nominal Range |
0 ~ 5 ppm |
| Maximum Overload |
20 ppm |
| Sensitivity (20℃) |
0.4 ± 0.2 μA/ppm |
| Response Time (T90) |
≤ 60 s |
| Zero Signal (20℃) |
< ±80 nA |
| Baseline Shift (-40℃ ~ 50℃) |
< 60 ppb (After compensation) |
| Resolution |
10 ppb |
| Linearity |
Linear up to 5 ppm |
| Bias Voltage |
0 mV |
Product Dimensions
Environmental
| Temperature Range |
-40℃ ~ 50℃ |
| Pressure Range |
1 ± 0.1 atm |
| Humidity Range |
15% ~ 90%RH non-condensing |
Life Time
| Long Time Output Drift |
< 2% signal/month |
| Recommended Storage Temp |
10℃ ~ 30℃ |
| Expected Operating Life |
3 years in clean air |
| Storage Life |
6 months in original packaging |
| Warranty |
24 months |
Intrinsic Safety Data
| Max. Current at 20ppm SO2 |
< 0.2 mA |
| Max. O/C Voltage |
1.3 V |
| Max. S/C Current |
< 1.0 A |
Physical Characteristics
| Housing Material |
ABS |
| Weight (Nominal) |
8 g |
| Orientation |
None |
Installation
Output signals from the sensor pins are different. Inappropriate use of the pins in product design will affect the sensor functionality. Exposure to high concentrations of solvent vapors should be avoided under any condition. Mechanical overstress may cause deformation or cracks of the plastic enclosure of the sensor. If the sensor is used in extreme environmental conditions, please contact us for more details.
Cross-Sensitivity Data
| Gas |
Concentration (ppm) |
Output Signal (ppm SO2 equivalent) |
| Carbon Monoxide |
300 |
< 3.0 |
| Hydrogen Sulfide |
15 |
0.0 |
| Nitric Oxide |
35 |
0.0 |
| Nitrogen Dioxide |
5 |
-5.0 |
| Ozone |
5 |
-6.0 |
Note: The cross sensitivities include but not limited to the above gases. It may also respond to other gases. The data in the table above may vary from different batches of sensors and the changes of test environment. Calibration using the gases that have the cross sensitivities to this sensor is not recommended.
Safety Note
The sensor is designed to be used in certain instruments for life critical applications. To ensure the sensor functions per its specifications inside the instrument, it is required to read the instrument user's guide carefully and comply with the calibration procedures by using certified target calibration gas before each use. Failure to do so may cause serious injury and fatality. Please do not open the sensor plastic enclosure because the electrolyte and other chemicals stored inside are harmful.
It is highly recommended for customers to validate the sensor performance using this document as a reference for their product designs or applications. |
