Product Introduction

4-Series SO2-2000 Sensor
Datasheet download
Product Description

This sensor is designed for the measurement of Sulfur Dioxide concentration in gas phase. It can be used as the pin-to-pin replacement of the standard 4-series electrochemical Sulfur Dioxide sensors made by the other manufacturers.

Performance Characteristics
Nominal Range 0 ~ 2,000 ppm
Maximum Overload 4,000 ppm
Sensitivity (20℃) 0.020 ± 0.008 μA/ppm
Response Time (T90) ≤ 60 s
Zero Signal (20℃) < ±0.4 μA
Baseline Shift (-20℃ ~ 50℃) < 4 ppm
Resolution 5 ppm
Linearity Linear up to 2,000 ppm
Bias Voltage 0 mV


Product Dimensions

Temperature Range -20℃ ~ 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 2 years in clean air
Storage Life 6 months in original packaging
Warranty 12 months
Intrinsic Safety Data
Max. Current at 4,000ppm 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) 5 g
Orientation None

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)
Hydrogen Sulfide 15 < 1.0
Carbon Monoxide 100 < 1.0
Nitric Oxide 50 0.0 ~ 5.0
Nitrogen Dioxide 5 -5.0 ~ 0.0
Hydrogen 400 < 1.0
Ammonia 20 0.0
Chlorine 5 -1.0 ~ 0.0
Acetylene 10 < 30.0
Ethylene 50 < 45.0

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.

Temperature Data


Safety Note

This 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.