INSTRUMENTATION AND CONTROL TUTORIAL 2 – SENSORS …

1 INSTRUMENTATION AND CONTROL TUTORIAL 2 SENSORS AND PRIMARY TRANSDUCERS This TUTORIAL provides an overview of instrument SENSORS used in process and automatic CONTROL . It is useful to anyone studying measurement systems and INSTRUMENTATION but it is provided mainly in support of the EC module D227 CONTROL System Engineering. This TUTORIAL is mainly descriptive. CONTROL is a broad concept and the following might apply to an automated system such as a robot or to a process CONTROL system such as a pneumatic valve controlling the flow of steam in a pipe. On completion of this TUTORIAL , you should be able to do the following. Explain a basic measurement system. Explain the basic working principles of a variety of temperature SENSORS . Explain the basic working principles of a variety of pressure SENSORS . Explain the basic working principles of a variety of speed transducers. Explain the basic working principles of a variety of flow meters.

• Bourdon Tube. • Spring and Piston. • Bellows and capsules. • Diaphragm. 3.1. BOURDON TUBE Figure 9 The Bourdon tube is a hollow tube with an elliptical cross section. When a pressure difference exists between the inside and outside, the tube tends to straighten out and the end moves. The movement is usually coupled to a

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  Pressure, Tubes, Bourdon tube, Bourdon

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