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Choices for control method vary by controller type but choices generally range from the simplest on/off forms to the more sophisticated PID types.
Controls and controllers range from relatively simple pump controls for flow applications to sophisticated PLCs with multiple input/output functions and network communications used for full factory automation. Some flow controls for pneumatic systems are nothing more than manually adjustable valves that vary the air flowing in pneumatic systems.
However Many process controllers use some form of PI or PID control, acronyms for proportional integral and proportional integral derivative control.
Flow Controllers are mechanical or electro-mechanical devices composed of measuring sensors or controlling elements that are used to ensure media flow in manufacturing processes. They are made for gases as well as liquids of many types, and are available in many sizes and configurations depending on the application. Some flow controllers consist of mechanical valves, while others are electronically operated and controlled.
MFC ( Mass flow Controller ) OR PLC based controllers are good choices for flow control.
PID controllers have to use flow control loop application. It can be used to regulate temperature, pressure and flow.
PID loop is the widely accepted control system.
P is proportional
I is Integral
D is Differential.
