Product Overview
The SX-GSO2FSA Series is a potentiostatic four-electrode electrochemical sulfur dioxide sensor. Sulfur dioxide and oxygen undergo oxidation–reduction reactions at the working electrode and counter electrode, respectively, generating an electrical current. The output current is proportional to the SO₂ concentration, allowing SO₂ concentration to be determined from the measured current. An auxiliary electrode compensates the baseline current, and the compensation algorithm improves measurement accuracy at low concentrations.
Main Features
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Four Electrodes, Low Detection Limit, High Accuracy —— Auxiliary-electrode zero-point compensation for improved low-range accuracy
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Fast Response, Fast Recovery —— Quick response with rapid baseline recovery
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Low Power, High Sensitivity —— Low power consumption with high sensitivity
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High Resistance to Interference, Low Temperature Dependence —— Stable performance across operating temperatures
- High Repeatability and Stability —— Consistent long-term performance
Product Application
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Mine-site sulfur dioxide gas detection
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Industrial emissions monitoring — sulfur dioxide gas detection
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Traffic emissions management — sulfur dioxide gas detection
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Smart-city air-quality monitoring — sulfur dioxide gas detection
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Technical Data
| Measurement | |
| Example Model | SX-GSO2FSA-600 |
| Detection Principle | Electrochemical, four-electrode (potentiostatic) |
| Detection Gas | Sulfur Dioxide (SO₂) |
| Detection Range | 0–10 ppm |
| Maximum Overload Concentration | 200 ppm |
| Sensitivity | |
| Sensitivity | 0.4 ± 0.2 µA/ppm |
| Resolution | 20 ppb |
| Linearity | Linear |
| Response | |
| Response Time | ≤ 60 s |
| Repeatability | 2% of output signal |
| Long-Term Stability | < ±2% of signal/month |
| Stability & Service Life | |
| Shelf Life | 12 months after delivery |
| Service Life | 2 years |
| Electrical Data | |
| Bias Voltage | 0 V |
| Load Resistance | 10 Ω |
| Environmental Conditions | |
| Operating Temperature | −30°C to +50°C |
| Operating Humidity | 15–90% RH, non-condensing |
| Operating Pressure | 90–110 kPa |
| Mechanical Data | |
| Body Diameter | Ø31.5 mm |
| Body Height | 16.2 mm |
| Pin Length | 3.9 mm |
| Pin Diameter | Ø1 mm |
| Dimensional Tolerance | ±0.2 mm |
| Cross-Interference | |
| Hydrogen (H₂) | Test concentration: 100 ppm; Cross-Sensitivity: 0.1% |
| Carbon Monoxide (CO) | Test concentration: 100 ppm; Cross-Sensitivity: 2.0% |
| Hydrogen Sulfide (H₂S) | Test concentration: 50 ppm; Cross-Sensitivity: 0.1% |
| Nitrogen Dioxide (NO₂) | Test concentration: 10 ppm; Cross-Sensitivity: −50.0% |
| Nitric Oxide (NO) | Test concentration: 20 ppm; Cross-Sensitivity: 1.3% |
| Ammonia (NH₃) | Test concentration: 20 ppm; Cross-Sensitivity: 0.2% |
Certifications & Compliance
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