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ETO-A1 Ethylene Oxide Sensor ETO Sensor Description
Alphasense is expanding its line of Electrochemical Toxic Gas Sensors to address industry-specific requirements, including emissions monitoring, process safety, environmental monitoring and VOCs.
Ethylene Oxide (C2H4O)
The ETO is a general purpose sensor, primarily developed for monitoring Ethylene Oxide but also capable of measuring other volatile organic compounds (VOCs). Our toxic evaluation board allows easy adjustment of the bias voltage to optimise this sensor for the required application.
See application note AAN113.
Available in A and B series
ETO-A1 Ethylene Oxide Sensor ETO Sensor Schematic Diagram
| ETO-A1 Ethylene Oxide Sensor ETO Sensor PERFORMANCE | ||
| Sensitivity | nA/ppm in 20ppm EtO | 2000 to 3200 |
| Response time | t90 (s) from zero to 20ppm EtO | <150 |
| Zero current | ppm equivalent in zero air | ± 0.6 |
| Resolution | RMS noise (ppm equivalent) | <0.1 |
| Range | ppm EtO limit of performance warranty | 100 |
| Linearity | ppm error at full scale, linear at zero, 40ppm EtO | 5 to 10 |
| Overgas limit | maximum ppm for stable response to gas pulse | 200 |
| ETO-A1 Ethylene Oxide Sensor ETO Sensor LIFETIME | ||
| Zero drift | ppm equivalent change/year in lab air | nd |
| Sensitivity drift | % change/month in lab air, twice monthly test | nd |
| Operating life | months until 80% original signal (12 month warranted) | > 24 |
| ETO-A1 Ethylene Oxide Sensor ETO Sensor ENVIRONMENTAL | ||
| Sensitivity @ -20°C | % (output @ -20°C/output @ 20°C) @ 40ppm EtO | 35 to 65 |
| Sensitivity @ 50°C | % (output @ 50°C/output @ 20°C) @ 40ppm EtO | 110 to 140 |
| Zero @ -20°C | ppm equivalent change from 20°C | <± 0.5 |
| Zero @ 50°C | ppm equivalent change from 20°C | <2 to 4 |
| ETO-A1 Ethylene Oxide Sensor ETO Sensor CROSS SENSITVITY | ||
| H2S sensitivity | % measured gas @ 20ppm H2S | <200 |
| NO2 sensitivity | % measured gas @ 10ppm NO2 | < 50 |
| Cl2 sensitivity | % measured gas @ 10ppm Cl2 | <-1 |
| NO sensitivity | % measured gas @ 50ppm NO | <80 |
| SO2 sensitivity | % measured gas @ 20ppm SO2 | <50 |
| CO sensitivity | % measured gas @ 400ppm CO | <30 |
| H2 sensitivity | % measured gas @ 400ppm H2 | <0.5 |
| C2H4 sensitivity | % measured gas @ 80ppm C2H4 | <100 |
| NH3 sensitivity | % measured gas @ 25ppm NH3 | <0.1 |
| HCHO sensitivity | % measured gas @ 4ppm HCHO | 90 |
| CO2 sensitivity | % measured gas @ 5% CO2 | <0.1 |
| ETO-A1 Ethylene Oxide Sensor ETO Sensor KEY SPECIFICATIONS | ||
| Temperature range | °C | -30 to 50 |
| Pressure range | kPa | 80 to 120 |
| Humidity range | % rh continuous | 15 to 90 |
| Storage period | months @ 3 to 20°C (stored in original container) | 6 |
| Load resistor | Ω (recommended) | 10 to 47 |
| Bias voltage | mV (working electrode potential above reference electrode potential) | 300 |
| Weight | g | <6 |
Matched Transmitter board for ETO-A1 ETO Sensor
4-20mA Digital Transmitter Board
• Factory calibration, custom-set for immediate use
• Digital zero, sensitivity and temperature compensation
• Digital and 4-20mA output
• Biased or unbiased operation
• Calibration and range change
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