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Hydrogen Sulfide Sensor

Hydrogen Sulfide Sensor
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Hydrogen Sulfide Sensor p-type Metal Oxide Technical Specification This sensor responds well in the temperature and humidity extremes of the oil and gas industry. Unlike common n-type sensors, this p-type sensor has a large dynamic range, repeatable response, low humidity response and resistance increases in the presence of H2S. The change in resistance can be converted to an output voltage via a simple electrical circuit. Although the sensor can be used in constant temperature/ voltage mode, best response is achieved when the sensor is cycled between 400°C (sensing temperature) and 525°C (reset temperature). See our Application Note. PERFORMANCE Range Sensor resistance (Ro) Sensor resistance (Rg) Sensor resistance ratio (Rg/Ro x 100%) Gas response (Rg/Ro - 1 = k.Concn) Heater resistance (RH @ 23 ±2oC) Heater resistance (RH @ 400 ±10oC) Heater resistance (RH @ 525 ±10oC) Heater power consumption (mW) Operating Temperature Range CROSS SENSITIVITY H2 sensitivity EtOH sensitivity C3H8 sensitivity NH3 sensitivity SO2 sensitivity % measured gas @ 100 ppm H2 % measured gas @ 50 ppm EtOH % measured gas @ 500 ppm C3H8 % measured gas @ 25 ppm NH3 % measured gas @ 25 ppm SO2 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. For further information on the performance of this sensor, on other sensors in our range. please contact Alphasense Ltd. 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

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Hydrogen Sulfide Sensor p-type Metal Oxide Performance Data Response (Rg/Ro) Calibration curve in 50% rh air. Operating in 2temperature mode with a 5:1 cycle ratio of sensing (400oC) and resetting (525oC). H2S concentration (ppm) Figure 2 Response from 8 to 52ppm H2S Response (Rg/Ro) Real time response for 852ppm H2S in 50% rh air. Sensor operating in 2temperature mode with a 5:1 cycle ratio of sensing (400oC) and resetting (525oC). The sensor returns repeatedly to the same baseline resistance. Time (minutes) Figure 3 Response from 10% to 90% rh at 230C Response Rg(% rh)/ R0(10% rh)...

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