PID Controllers with Output High Select Logic
The below figure 1 shows a typical control scheme with two controllers driving the same control valve via high select logic. The controller PIC-1 is the main pressure controller and…
Overview of Split Range Control
A very common control scheme is split range control in which the output of a controller is split to two or more control valves. Split Range Control For example: Controller…
Self Actuated Pressure Control Valve Principle
Self actuated pressure control valve do not depend on any external signal for pressure control. As the name suggests, pressure in the process line itself is used as an actuating signal…
Zero Speed Switch Working Principle
Monitoring Speed is essential in any automation process. Speed of any equipment driven by an electric motor can very due to variety of reasons e.g. overload, underload, breakage of transmission…
Overview of Proximity Switches
A proximity Switch is a sensor able to detect the presence of nearby objects without any physical contact. Application:- Proximity switches provide better alternative to the conventional electro-mechanical limit switches for…
Electrical Terminology
The Basic Electrical Terminology Terms as follows: Active Power (Watt): Sometime called Real Power, True Power or Effective power. It describes the actual amount of power present in a system…
Main differences between Sinking and Sourcing Circuits
Sinking vs Sourcing : What are the main differences between sinking and sourcing circuits ? Sinking is switching the load in the negative leg of a circuit.
Difference Between the Sinking and Sourcing?
So why the confusion over Sinking and Sourcing? What's the difference anyway? Sinking and sourcing circuits are often a source of confusion for people newly introduced to the concept, especially…
Questions & Answers of Power Systems
What are the sources of reactive power? How it is controlled? The sources of reactive power are generators, capacitors, and reactors. These are controlled by field excitation. Give some excitation…
Ultrasonic Flow Meters Animation
Ultrasonic Flow meters measures Fluid velocity by sending ultrasonic pulse from an upstream transducer to a downstream transducer and back again.
