Transcription of Chapter 2 Electrochemical Sensors
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Chapter 2 Electrochemical Sensors
27 Chapter 2 Electrochemical SensorsChapter 2 ElectrochemicalSensorsThe oldest Electrochemical Sensors date back tothe 1950s and were used for oxygen recently, as the Occupational Safety andHealth Administration (OSHA) began requiring themonitoring of toxic and combustible gases in confinedspace applications, new and better electrochemicalsensors have been the mid-1980s, miniaturized electrochemicalsensors became available for detection of many dif-ferent toxic gases in PEL ranges, with the Sensors ex-hibiting good sensitivity and selectivity.
Electrochemical sensors operate by reacting with the gas of interest and producing an elec-trical signal proportional to the gas concen-tration. A typical electrochemical sensor con-sists of a sensing electrode (or working elec-trode), and a counter electrode separated by a thin layer of electrolyte, Figure 3. Gas that comes in contact with the ...
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