With two-position control, the final control element may be in only one of two positions. These two positions are sometimes called on/off or open/closed. Consequently, it is often called on-off control. Two-position control is used in many systems, such as heating and air conditioning, water heaters and ovens. In the example, two-position control is the …
Instruments I hope you have a general understanding what a feedback control loop is, if not please refer the following article – Feedback Control Loop Sensors You have read that a sensor monitors and measures what is happening in the process. Examples of sensors include: thermocouples, floats, limit switches, pressure switches, pressure switches, moisture meters, and …
In most processes, there are six basic elements.Process control elements are 1. Controlled variable What you want to control (temperature pressure, level, flow rat, dimensions, position, etc.) 2. Measured variable What you observe in order to determine the actual condition of the controlled variable In most cases, you measure the controlled …
Pneumatic Control System What is pneumatic ? Pneumatic is the technology that makes use of gas or pressurized air. Components of Pneumatic control system 1.Directional control Valves These are functional valves used in logic implementation. Divided according to the number of ports / passages available and number of valve positions 2.Two Way Valves …
Standalone controller (PID) A controller is an instrument used for controlling a process variable (measurement). Its continuously monitors the error signal and gives a corrective output to the final control element. a measurement variable desired variable c deviation output Measurement variable: It is the demand variable measured and controlled. Desired Variable: …
What are the process Variables? The process Variables are: • Flow. • Pressure. • Temperature. • Level. • Quality i.e. % O2, CO2, pH etc. Define all the process Variable and state their unit of measurement. ? Flow: Any fluids or liquids flowing from one place to another place is called flow and it is …
