Transcription of Chapter 2 Electrochemical Sensors
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Chapter 2 Electrochemical Sensors
Chapter 2 Electrochemical Sensors Chapter 2. Electrochemical Sensors T. he oldest Electrochemical Sensors date back to the 1950s and were used for oxygen monitoring. More recently, as the Occupational Safety and Health Administration (OSHA) began requiring the monitoring of toxic and combustible gases in confined space applications, new and better Electrochemical Sensors have been developed. By the mid-1980s, miniaturized Electrochemical Sensors became available for detection of many dif- Fig. 1. Electrochemical Sensors ferent toxic gases in PEL ranges, with the Sensors ex- hibiting good sensitivity and selectivity. Currently, a variety of Electrochemical Sensors are being used ex- tensively in many stationary and portable applications for personal safety. Figure 1 shows a small collection of such Electrochemical Sensors . The physical size, geometry, selection of various components, and the construction of an electrochemi- cal sensor usually depends on its intended use.
29 Chapter 2 Electrochemical Sensors first passes through a small capillary-type opening and then diffuses through a hydrophobic barrier, and even- tually reaches the electrode surface. This approach is
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