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CO-AX

CO-AX
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CO-AX Carbon Monoxide SensorEN 50379 Compliant for Stack Gases Top View PERFORMANCE Sensitivity nA/ppm in 400ppm CO 55 to 100 Response time t90 (s) from zero to 400ppm CO < 30 Zero current ppm equivalent in zero air < ± 3 Resolution RMS noise (ppm equivalent) < 0.5 Range ppm CO limit of performance warranty 2,000 Linearity ppm error at full scale, linear at zero and 800ppm CO < ± 40 Overgas limit maximum ppm for stable response to gas pulse 4,000 LIFETIME Zero drift ppm equivalent change/year in lab air <0.2 Sensitivity drift % change/year in lab air, monthly test <6 Operating life months until 80% original signal (24 month warranted) > 24 Zero @ 0°C ppm equivalent change from 20°C < 0 to 3 Zero @ 50°C ppm equivalent change from 20°C < 0 to -6 CROSS Filter capacity ppm-hours H2S 250,000 SENSITIVITY Filter capacity ppm-hours NO2 500,000 Filter capacity ppm-hours NO 20,000 Filter capacity ppm-hours SO2 250,000 NO sensitivity % measured gas @ 500ppm NO < -2 SPECIFICATIONS Pressure range kPa 80 to 120 Storage period months @ 0 to 20°C (stored in sealed pot) 6 Load resistor Q (recommended) 10 to 47 Important. The CO-AX must be operated with a 0 Volt bias between Reference & Working electrodes. Failure to comply with this requirement will result in a loss of its low Hydrogen cross sensitivity performance. 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 10 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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CO-AX Performance Data Figure 2 CO Sensitivity Temperature Dependence Figure 3 Hydrogen Sensitivity Temperature Dependence Time (seconds) Figure 3 shows the strong temperature dependence of the CO-AX to hydrogen. Since hydrogen sensitivity is less than 4% at 20oC, hydrogen interference can practically be ignored at low temperatures. However, at 50oC hydrogen interference is 14%. This data is taken from a typical batch of sensors. The mean and ±95% confidence intervals are shown. Figure 4 shows hydrogen sensitivity for a typical batch of eight CO-AX sensors at 30oC following EN50379....

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