THIS Demonstration 3-Term Controller (Model: SE 200) developed for introducing students to the principle
of the pneumatic 3-term controller. The characteristics of proportional, proportional and integral, proportional
and derivative and proportional and integral and derivative control are demonstrated. The operation of the
differential bellows, feedback bellows, nozzle and flapper assembly, pneumatic relay are shown. The advent of
electronics has advanced the application of feedback control theory. Nevertheless, pneumatic control is still widely used in industry in areas such as oil and gas platforms and air conditioning controls.



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