H2S-A4 Hydrogen Sulfide Sensor iffDROSEH SULFJ Figure 1 H2S-A4 Schematic Diagram ^Hydrogen Sulfide Bottom View Side View Response time Zero current Overgas limit ±2 standard deviations (ppb equivalent) ppm H2S limit of performance warranty ppb error at full scale, linear at zero and 10ppm H2S 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 <±100 Sensitivity drift % change/year in lab air, monthly test < 20 Operating life months until 50% original signal (12 month warranted) 24 Pressure range Humidity range Storage period Load resistor months @ 3 to 20°C (stored in sealed pot) 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

H2S-A4 Performance Data Perf erformance Data Figure 2 Sensitivity Temperature Dependence Figure 2 shows the temperature dependence of sensitivity at 2ppm H2S. This data is taken from a typical batch of sensors. Figure 3 Zero Temperature Dependence (uncorrected) 100 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 H2S. Use of Alphasense AFE circuit reduces noise to 5ppb,...