Chemical Sensors:

A chemical sensor is an essential component of an analyzer, it is a device that transforms chemical information, ranging from the concentration of a specific sample component to total composition analysis, into an analytically useful signal. Chemical sensors contain two basic functional units: a receptor part and a transducer part. Some sensors may include a separator which is, for example, a membrane.

http://www.omicsonline.com/open-access/biosensors

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