ETO-A1 Ethylene Oxide SensorFigure 1 ETO-A1 Schematic DiagramPATENTED Technical SpecificationAll dimensions in millimetres (± 0.1mm)Top ViewPERFORMANCESensitivityResponse timeZero currentResolutionRangeLinearityOvergas limitLIFETIMEZero driftSensitivity driftOperating lifeBottom ViewSide View1600 to 2200< 75± 0.2< 0.11005 to 10200ndnd> 2440 to 60110 to 140< ± 0.5< 2 to 4<200<50<-1<80<50<30<50<100<0.1<0.190nA/ppm in 20ppm EtOt90 (s) from zero to 20ppm EtOppm equivalent in zero airRMS noise (ppm equivalent)ppm EtO limit of performance warrantyppm error at full scale, linear at zero, 40ppm EtOmaximum ppm for stable response to gas pulseppm equivalent change/year in lab air% change/month in lab air, twice monthly testmonths until 80% original signal (12 month warranted)ENVIRONMENTALSensitivity @ -20°C% (output @ -20°C/output @ 20°C) @ 40ppm EtOSensitivity @ 50°C% (output @ 50°C/output @ 20°C) @ 40ppm EtOZero @ -20°Cppm equivalent change from 20°CZero @ 50°Cppm equivalent change from 20°CCROSSSENSITVITYH2SNO2Cl2NOSO2COH2C2H4NH3CO2sensitivitysensitivitysensitivitysensitivitysensitivitysensitivitysensitivitysensitivitysensitivitysensitivityHCHOsensitivity% measured gas @ 20ppm H2S% measured gas @ 10ppm NO2% measured gas @ 10ppm Cl2% measured gas @ 50ppm NO% measured gas @ 20ppm SO2% measured gas @ 40ppm CO% measured gas @ 400ppm H2% measured gas @ 80ppm C2H4% measured gas @ 25ppm NH3% meaured gas @ 5%% measured gas @ 4ppm HCHOKEY SPECIFICATIONSTemperature rangePressure rangeHumidity rangeStorage periodLoad resistorBias voltageWeight°CkPa% rh continuousmonths @ 3 to 20°C (stored in original container)Ω (recommended)mV (working electrode potential above reference electrode potential)g-30 to 5080 to 12015 to 90610 to 47300< 6At the end of the product’s life, do not dispose of any electronic sensor, component or instrument in the domesticwaste, but contact the instrument manufacturer, Alphasense or its distributor for disposal instructions.NOTE: all sensors are tested at ambient environmental conditions, with 10 ohm load resistor, unless otherwise stated. As applications of use are outside our control, theinformation provided is given without legal responsibility. Customers should test under their own conditions, to ensure that the sensors are suitable for their ownrequirements.Alphasense Ltd, Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. CM77 7AA. UKTelephone: +44 (0) 1376 556 700 Fax: +44 (0) 1376 335 9 E-mail: sensors@alphasense.com Website: www.alphasense.comETO-A1 Performance DataFigure 2 Sensitivity Temperature Dependence140 Technical Specification% Output (referenced to 20oC)120100806040200Mean\"+95% conf.\"\"-95% conf.\"Figure 2 shows the variation insensitivity caused by changesin temperature.This data is taken from atypical batch of sensors. Themean and ± 95% confidenceintervals are shown.-30-20-1001020304050Temperature (oC)Figure 3 Zero Temperature Dependence3.532.5Mean\"+95 %conf.\"\"-95 % conf.\"Output (eq. ppm)21.510.50-20-1001020304050Figure 3 shows the variationin zero output caused bychanges in temperatureexpressed as ppm gasequivalent. The mean and± 95% confidence intervalsare shown.This data is taken from atypical batch of sensors.-30-0.5-1Temperature (oC)Figure 4 Response Time Temperature Dependence350300250The response time depends onboth gas properties and sensorelectrochemistry.t90 Response (s)200150100500-30-20-1001020304050Temperature (oC)For further information on the performance of this sensor, on other sensors in the range or any other subject, pleasecontact Alphasense Ltd. For Application Notes visit “www.alphasense.com”.In the interest of continued product improvement, we reserve the right to change design features and specifications without prior notification. The data contained in thisdocument is for guidance only. Alphasense Ltd accepts no liability for any consequential losses, injury or damage resulting from the use of this document or the informationcontained within. ( ©ALPHASENSE LTD ) Doc. Ref. ETOA1/FEB09
