Gas sensor
Gas sensing is an important science with broad reaching implications throughout society. Gas sensors are used to monitor gas levels for safety, environmental impact and process control. Gas sensors are useful for safety monitoring, process monitoring and control, evaluation of gaseous product quality, environmental control, and etc. Electrochemical gas sensors are typically used to determine the composition of a gas and may further be used to detect the presence of various elements or compounds in a gas. Gas sensors for sensing carbon monoxide (CO) and other toxic gases are used in a wide variety of applications, from commercial and residential markets to automobiles and recreational vehicles to scientific instrumentation. An electrochemical gas sensor for sensing an oxidisible or reducible gas, such as carbon monoxide, usually includes a sensing electrode, a counter electrode and a diffusion barrier. The diffusion barrier allows gas to be sensed, to pass to the sensing electrode. Various types of gas sensors are installed in a vehicle in order to detect a specific gas component contained in exhaust gas. The gas sensor arrangements can be used to monitor the carbon dioxide content of the interior air to increase the energy efficiency of the heating and air conditioning systems. Typical gas sensors installed in an exhaust system of automotive internal combustion engines are constructed to have a sensor element fitted hermetically within a hollow cylindrical housing. A gas sensor for detecting the oxygen concentration or the like in the exhaust gas internally includes a sensing element for measuring a specific gas concentration of a measured gas. Oxygen sensors provide oxygen concentration measurements for determination of optimum combustion conditions, maximization of fuel economy, and the management of exhaust emissions.
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