Proportional Controller Principle
If the outflow (Qo) increases then the level in the tank will fall. The pressure sensed by the level transmitter, which
Control Systems
We have the largest collection of Industrial Control Systems articles like industrial automation, Distributed Control Systems (DCS).
Integral Controller Principle
Reset of Integral Action Most of the processes we will be controlling will have a clearly defined setpoint. If we wish
Derivative Controller Principle
RATE OR DERIVATIVE ACTION Consider a control system subjected to a disturbance, which causes the error to increase in a ramped
Boiler Drum Level Control Systems
Drum Level Control Systems are used extensively throughout the process industries and the Utilities to control the level of boiling
Single Element Drum Level Control System
The Below Figure depicts the control scheme for single-element drum level control. In this configuration, only the water level in
Two Element Drum Level Control System
A two-element drum level control system is capable of providing close adherence of drum level to its set-point under steady-state
Three Element Drum Level Control System
In most drum level control applications, the two-element drum level control will maintain the required water/steam interface level – even
Control Room and Field Instruments Questions and Answers
Instrument Engineers Interview Questions, Control Room Interview Questions, Field Instruments Questions and Answers, Instrumentation Questions & Answers.
Cascade Control Principle
What is Cascade Control? In single-loop control, the controller’s set point is set by an operator, and its output drives
Sink or Source? Normally Open or Normally Closed?
We discuss concepts of Sink or Source used in electrical circuits or in PLC wiring. Also we deal with basics of normally open contact or normally closed contact.