Nitrog Dioxide ogen NO2-B4 Nitrogen Dioxide Sensor 4-Electrode 4-Electrode Technical Specification Figure 1 NO2-B4 Schematic Diagram Top View PERFORMANCE Sensitivity Response time Zero current Noise* Range Linearity Overgas limit Bottom View Side View nA/ppm at 2ppm NO2 t90 (s) from zero to 2ppm NO2 nA in zero air at 20°C ±2 standard deviations (ppb equivalent) ppm NO2 limit of performance warranty ppb error at full scale, linear at zero and 5ppm NO2 maximum ppm for stable response to gas pulse * Tested with Alphasense ISB low noise circuit Zero drift Sensitivity drift Operating life ENVIRONMENTAL Sensitivity @ -20°C Sensitivity @ 50°C Zero @ -20°C Zero @ 50°C CROSS SENSITIVITY 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 H2S sensitivity NO sensitivity Cl2 sensitivity SO2 sensitivity CO sensitivity H2 sensitivity C2H4 sensitivity NH3 sensitivity CO2 sensitivity O3 sensitivity Halothane sensitivity KEY SPECIFICATIONS Temperature range Pressure range Humidity range Storage period Load resistor Weight % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas °C kPa % rh continuous months @ 3 to 20°C (stored in sealed pot) Ω (ISB circuit is 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: [email protected] Website: www.alphasense.com

Perf erformance Data NO2-B4 Performance Data Figure 2 Sensitivity Temperature Dependence Figure 2 shows the temperature dependence of sensitivity at 2ppm NO2. This data is taken from a typical batch of sensors. Figure 3 Zero Temperature Dependence 400 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 Response to 20 ppb NO2 using ISB circuit 10 Figure 4 shows response to 20ppb NO2. Use of Alphasense...