Abstract
The purpose of this chapter is to provide information on measurement systems. One of the most interesting aspects of a transducer is its physical properties and performance characteristics of a transducer. Several examples related to this are given in the chapter. In addition to this, the chapter also considers the performance characteristics that influence the choice of transducer for a particular application. Characteristics that are often important are the operating life, storage life, power requirements and safety aspects of the device, as well as the cost and availability of service. In industrial situations, the property being measured or controlled is called the controlled variable. All measurements involve a comparison between a measured quantity and a reference standard. Two fundamental methods of measurement—null method and deflection method—are explained in the chapter. An important parameter associated with every transducer is its sensitivity. This is a measure of the magnitude of the output divided by the magnitude of the input.
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