Electrochemical Sulfur Dioxide Gas Sensor (SO2 Sensor) - 4S Rev. 2 CiTiceL

• Operating Principle: 3-electrode electrochemical
• Measurement Range: 0-20 ppm SO2
• Maximum Overload: 150 ppm SO2
• Filter: To remove H2S
• Sensitivity: 0.5 ± 0.1 µA/ppm
• Response Time (T90): < 25 Seconds at 20°C
• Repeatability: < ±2% of signal
• Recommended Storage Temp: 0 - 20°C
• Operating Humidity: 15% to 90%RH non-condensing.

  • Model Number: 4S Rev. 2 CiTiceL
  • Data Sheet: Date Sheet File
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  • Electrochemical Sulfur Dioxide Gas Sensor (SO2 Sensor)
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Product Specification

4S Rev. 2 CiTiceL Sulfur Dioxide Sensor (SO2 Sensor) Key Features & Benefits:
• Industry leading reliability
• Improved performance variability

4S Rev. 2 CiTiceL Sulfur Dioxide Sensor (SO2 Sensor) Technical Specifications

Operating Principle 3-electrode electrochemical
Measurement Range 0-20 ppm SO2
Maximum Overload 150 ppm SO2
Filter To remove H2S
Filter Capacity 1000 ppm hrs @ 25 ppm H2S
Sensitivity 0.5 ± 0.1 µA/ppm
Response Time (T90) < 25 Seconds at 20°C
Baseline Offset (clean air) -0.2 to +0.5 ppm equivalent
Zero Shift (+20°C to +40°C) < 0.1 ppm equivalent
Repeatability < ±2% of signal
Linearity Linear over measurement range 0-20 ppm and within ±5%
Recommended Load Resistor 10 Ω
Bias Voltage Not required
Resolution Dependent on electronics.
(0.1 ppm when using recommended electronics)
Housing Material Noryl 110
Weight Approx. 4.5 g
Orientation Any
Typical Applications Portable life safety
Operating Temperature Range:
  Continuous -20°C to +50°C
  Intermittent -40°C to +55°C
Recommended Storage Temp 0 - 20°C
Operating Pressure Range 1 atm ± 20%
Operating Humidity Range 15% to 90%RH non-condensing.
Maximum current at 150 ppm 0.1 mA
Maximum o/c Voltage < 0.75 V
Maximum s/c Current < 1.0 A
Long Term Output Drift < 10% per annum
Expected Operating Life 2 years in clean air
Storage Life 6 months in original packaging
Standard Warranty 12 months from date of despatch

* Specifications are valid at 20°C, 50% RH and 1013 mBar, using City Technology recommended circuitry. Performance characteristics outline the performance of sensors supplied within thefirst 3 months. Output signal can drift below the lower limit over time. 

CiTiceLs are designed for operation in a wide range of environments and harsh conditions. However, it is important that exposure to high concentrations of solvent vapours is avoided, both during storage, fitting into instruments, and operation.

When using sensors with printed circuit boards (PCBs), degreasing agents should be used before the sensor is fitted. Do not glue directly on or near the CiTiceL as the solvent may cause crazing of the plastic.

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