Transcription of Alphasense Application Note AAN 105-03 …
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Alphasense Application Note AAN 105-03 …
Alphasense Application Note AAN 105-03 Alphasense Limited Page 1 of 5 March 2009 Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley, Essex CM77 7 AATel: +44 (0) 1376 556700 Fax: +44 (0) 1376 335899 email: Web: 105-03 DESIGNING A POTENTIOSTATIC CIRCUITI ntroductionIn a three-electrode sensor, each electrode has a specific use: The working electrode responds to the target gas, either oxidising or reducing the gas,creating a current flow that is proportional to the gas concentration. This current must besupplied to the sensor through the counter electrode. The reference electrode is used by the potentiostatic circuit to maintain a fixed potential at theworking electrode. The working electrode potential must be maintained at the same potentialas the reference electrode potential for unbiased sensors, or with an offset for sensors thatrequire biasing.
Alphasense Application Note AAN 105-03 © Alphasense Limited Page 2 of 5 March 2009 Sensor Technology House, 300 Avenue West, Skyline 120, …
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