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H2S-B4

H2S-B4
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Hydrogen Sulfide drog H2S-B4 Hydrogen Sulfide Sensor 4-Electrode 4-Electrode Technical Specification Figure 1 H2S-B4 Schematic Diagram Bottom View Sensitivity Response time Zero current Noise* Range Linearity Overgas limit Side View nA/ppm at 2ppm H2S t90 (s) from zero to 2ppm H2S nA in zero air at 20°C ±2 standard deviations (ppb equivalent) ppm H2S limit of performance warranty ppb error at full scale, linear at zero and 40ppm H2S maximum ppm for stable response to gas pulse * Tested with Alphasense ISB 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 (12 month warranted) ENVIRONMENTAL Sensitivity @ -20°C (% output @ -20°C/output @ 20°C) @ 2ppm H2S Sensitivity @ 50°C (% output @ 50°C/output @ 20°C) @ 2ppm H2S Zero @ -20°C nA change from 20°C Zero @ 50°C nA change from 20°C CROSS SENSITIVITY NO2 sensitivity % measured gas Cl2 sensitivity % measured gas NO sensitivity % measured gas SO2 sensitivity % measured gas CO sensitivity % measured gas H2 sensitivity % measured gas C2H4 sensitivity % measured gas NH3 sensitivity % measured gas CO2 sensitivity % measured gas KEY Temperature range°C SPECIFICATIONS Pressure range kPa Humidity range % rh Storage period months @ 3 to 20°C (stored in sealed pot) Load resistor Ω (ISB circuit is recommended) Weight 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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H2S-B4 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 shows the variation in zero output of the working electrode caused by changes in 50 temperature, expressed as nA. Figure 3 Zero Temperature Dependence 50 0 -20 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 ISB circuit reduces noise to 1ppb,...

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