SS21ETO (C₂H₄O) Electrochemical Ethylene Oxide Sensor (0–20ppm)

The SS21ETO is an electrochemical sensor designed for accurate detection of ethylene oxide (C₂H₄O) in the range of 0–20 ppm. It provides an output signal of 270 ± 70 nA/ppm, with a response time under 200 seconds and resolution better than 0.5 ppm. Low cross-sensitivity to gases such as CO, H₂, NH₃, and vinyl chloride ensures reliable measurements. With a wide operating temperature range of -20 to +50℃ and a lifespan exceeding 24 months in air, this sensor is ideal for EO sterilization systems, chemical process monitoring, and industrial fixed gas detection applications.

Performance Characteristics
Output Signal	270±70 nA / ppm
Typical Baseline Range (pure air, @ 20°C)	≤ ±0.5 ppm C₂H₄O equivalent
Response Time (T90)	< 200 seconds
Filter	None
Measurement Range	0–20 ppm
Maximum Overload	100 ppm
Linearity	Linear
Repeatability	< ±5% of signal
Recommended Load Resistor	10 ohms
Resolution (Electronics Dependent)	< 0.5 ppm typical
Bias Voltage	+300 mV
Environmental
Temperature Range Continuous	-20°C to +50°C
Pressure Range	800 to 1200 mbar
Operating Humidity Range	15% to 90% RH
Lifetime
Long Term Output Drift	< 2% per annum
Recommended Storage Temp	0°C to 20°C
Expected Operating Life	> 24 months in air
Standard Warranty	24 months from date of dispatch
Intrinsic Safety Data
Maximum at 100 ppm	50 μA
Maximum o/c Voltage	< 1.0 V
Maximum s/c Current	< 0.1 A

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