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OX-A431 Oxidising Gas Sensor

OX-A431 Oxidising Gas Sensor
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OX-A431 Oxidising Gas Sensor Ozone + Nitrogen Dioxide 4-Electrode Figure 1 OX-A431 Schematic Diagram Sensing area Oo riot obscure Specification O3 Sensing PERFORMANCE Sensitivity Response time Zero current Noise* Range Linearity Overgas limit All dimensions in millimetres (± 0.15mm) 'J Bottom View Side View nA/ppm at 1ppm O3 t90 (s) from zero to 1ppm O3 nA in zero air at 20°C ±2 standard deviations (ppb equivalent) ppm O3 limit of performance warranty ppm error at full scale, linear at zero and 20ppm O3 maximum ppm for stable response to gas pulse * Tested with Alphasense AFE low noise circuit LIFETIME Zero drift ppb equivalent change/year in lab air Sensitivity drift % change/year in lab air, monthly test Operating life months until 50% original signal (24 month warranted) sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas KEY SPECIFICATIONS Temperature range Pressure range Humidity range Storage period Load resistor Weight °C kPa % rh continuous months @ 3 to 20°C (stored in sealed pot) Q (AFE circuit recommended) g NOTE: all sensors are tested at ambient environmental conditions, with 47 ohm load resistor, unless otherwise stated. As applications of use are outside our control, the information provided is given without legal responsibility. Customers should test under their own conditions, to ensure that the sensors are suitable for their own requirements. Alphasense Ltd, Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. CM77 7AA. UK Telephone: +44 (0) 1376 556 700 Fax: +44 (0) 1376 335 899 E-mail: sensors@alphasense.com Website: www.alphasense.com

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Perf erformance Data OX-A431 Performance Data Figure 2 Sensitivity temperature dependence to 1ppm O3 130 Figure 2 shows the mean and 95% confidence levels for the temperature dependence of sensitivity at 1ppm O3. Measuring Ozone at higher temperatures requires good casing design to ensure the Ozone reaches the sensor before reacting. This data is taken from a typical batch of sensors. Figure 3 Zero temperature dependence 200 Figure 3 shows the variation in zero output of the working electrode caused by changes in temperature, expressed as nA. This data is taken from a typical batch of...

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OX-A431 Oxidising Gas Sensor Ozone + Nitrogen Dioxide _4-Electrode_ Patented The OX-A431 detects both ozone and nitrogen dioxide (O3 +NO2). The NO2-A43F measures only nitrogen dioxide, filtering out ozone. Using these sensors together allows you to calculate the O3 concentration by subtracting the corrected NO2-A43F concentration from the corrected OX-A431 concentration. Before subtracting to determine ozone concentration, ensure that the signals from the two sensors have been corrected for electronic zero offset, sensor zero offset and temperature dependence, and sensitivity (nA/ppm)...

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Perf erformance Data OX-A431 Performance Data Figure 5 Sensitivity temperature dependence to 2ppm NO2 Figure 5 shows the temperature dependence of sensitivity at 2ppm NO2. This data is taken from a typical batch of sensors. The OX-A431 shows fast response and return to baseline, even at low concentrations. Figure 7 Response from 200 ppb to 0 ppb NO2 340 Figure 7 shows response from 200ppb NO2 to 0ppb NO2. Use of Alphasense AFE circuit reduces noise to 15ppb, with the opportunity of digital smooting to reduce noise even further. Technical Specification Offset voltage is due to intentional...

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