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SO2-A4

SO2-A4
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Dioxide SO2-A4 Sulfur Dioxide Sensor 4-Electrode 4-Electrode Technical Specification Figure 1 SO2-A4 Schematic Diagram Bottom View Sensitivity Response time Zero current Noise* Range Linearity Overgas limit Side View nA/ppm at 2ppm SO2 t90 (s) from zero to 2ppm SO2 nA in zero air at 20°C ±2 standard deviations (ppb equivalent) ppm limit of performance warranty ppb error at 20ppm SO2, linear at zero and 2ppm SO2 maximum ppm for stable response to gas pulse * Tested with Alphasense AFE low noise circuit Zero drift Sensitivity drift Operating life ppb equivalent change/year in lab air % change/year in lab air, monthly test months until 50% original signal (24 month warranted) ENVIRONMENTAL Sensitivity @ -20°C Sensitivity @ 50°C Zero @ -20°C Zero @ 50°C CROSS SENSITIVITY ppm·hrs % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas % measured gas Filter capacity H2S sensitivity NO2 sensitivity Cl2 sensitivity NO sensitivity CO sensitivity H2 sensitivity C2H4 sensitivity NH3 sensitivity CO2 sensitivity KEY Temperature range SPECIFICATIONS Pressure range Humidity range Storage period Load Resistor Weight °C kPa % rh continuous (see note below) months @ 3 to 20°C (stored in sealed pot) Ω (AFE circuit is recommended) g Note: Above 85% rh and 40oC a maximum continuous exposure period of 10 days is warranted. Where such exposure occurs the sensor will recover normal electrolyte volumes when allowed to rest at lower % rh and temperature levels for several days. 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 erfomance Data SO2-A4 Perfomance Data Figure 2 Sensitivity Temperature Dependence Figure 2 shows the temperature dependence of sensitivity at 2ppm SO2. This data is taken from a typical batch of sensors. Figure 3 Zero Temperature Dependence 300 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 from 20 to 200ppb SO2. Use of Alphasense AFE circuit reduces noise to 15ppb, with...

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