January 2011
Beginner to intermediate
248 pages
6h 20m
English
Content preview from Hydraulics and Pneumatics
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Chapter | seven. Process Control Pneumatics
If some industrial process is to be automatically controlled, there will be many process variables (e.g. temperature, flow, pressure, level) which need to be measured and kept at the correct value for safety and economical operation. In Figure 7.1, for example, water flow in a pipe is to be kept at some preset value.
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| Figure 7.1 Closed loop control |
In Figure 7.1 the flow is measured to give the current value (usually termed PV for process variable). This is compared with the required flow (called SP for set point) to give an error signal, which is passed to a controller. This adjusts the actuator drive signal ...
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