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Ethylene Oxide Sensor (ETO Sensor) - ETO-A1

• Range: 100 ppm EtO limit of performance warranty
• Sensitivity: 2000 to 3200 nA/ppm in 20ppm EtO
• Response time t90: < 150s from zero to 20ppm EtO
• Resolution: < 0.1 RMS noise (ppm equivalent)
• Temperature range: -30 to 50 °C
• Pressure range: 80 to 120kPa
• Humidity range: 15 to 90% rh continuous
• Weight: < 6 g

Model Number: ETO-A1
Data Sheet:

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Product Specification

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