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NO2-A4

NO2-A4
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Nitrog Dioxide ogen NO2-A4 Nitrogen Dioxide Sensor 4-Electrode 4-Electrode Technical Specification Figure 1 NO2-A4 Schematic Diagram Top View PERFORMANCE Sensitivity Response time Zero current Noise* Range Linearity Overgas limit Bottom View Side View nA/ppm at 1ppm NO2 t90 (s) from zero to 1ppm NO2 nA in zero air at 20°C ±2 standard deviations (ppb equivalent) ppm NO2 limit of performance warranty ppm error at full scale, linear at zero and 20ppm NO2 maximum ppm for stable response to gas pulse * Tested with Alphasense AFE low noise circuit Zero drift Sensitivity drift Operating life ENVIRONMENTAL Sensitivity @ -20°C Sensitivity @ 50°C Zero @ -20°C Zero @ 50°C CROSS SENSITIVITY KEY SPECIFICATIONS Temperature range Pressure range Humidity range Storage period Load resistor Weight ppb equivalent change/year in lab air % change/year in lab air, monthly test months until 50% original signal (12 month warranted) (% output @ -20°C/output @ 20°C) @ 2ppm NO2 (% output @ 50°C/output @ 20°C) @ 2ppm NO2 nA change from 20°C nA change from 20°C 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 sensitivity % measured gas °C kPa % rh continuous months @ 3 to 20°C (stored in sealed pot) Ω (AFE circuit recommended) g At the end of the product’s life, do not dispose of any electronic sensor, component or instrument in the domestic waste, but contact the instrument manufacturer, Alphasense or its distributor for disposal instructions. 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 NO2-A4 Performance Data Figure 2 Sensitivity temperature dependence 180 Figure 2 shows the temperature dependence of sensitivity at 1ppm NO2. This data is taken from a typical batch of sensors. Figure 3 Zero temperature dependence 140 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 sensors. Contact Alphasense for futher information on zero current correction. Figure 4 shows response to 200ppb NO2. Use of Alphasense AFE circuit reduces noise to 15ppb, with...

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