SS21ETO (C₂H₄O)

Electrochemical Ethylene Oxide Sensor (0–20ppm)

DESCRIPTION

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.

KEY FEATURES

- Measuring Range: 0–20 ppm (Max overload: 100 ppm)
- Output Signal: 270 ± 70 nA / ppm
- Response Time: T90 < 200 sec
- Resolution: ≤0.5 ppm (typical, dependent on circuitry)
- Repeatability: Within ±5% of signal
- Long-Term Drift: ≤2% per month
- Operating Temperature: -20℃ to +50℃
- Operating Life: ≥24 months in air
- Low Cross-Sensitivity: H₂, NH₃, Toluene, etc.

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

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

PRODUCTS

Product

SS21ETO (C₂H₄O)

SS21ETO (C₂H₄O)

Electrochemical Ethylene Oxide Sensor (0–20ppm)

DESCRIPTION

KEY FEATURES

Product Specifications

Sensor Specifications

Accessories

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