How Process Control Loop Works
A typical process control system is shown in Figure. Assume the physical variable to be controlled is the temperature. Basically Industrial
Control Systems
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Basic Process Control System
Consider a typical process control system. For a particular example let us look at an open tank, which supplies a process,
ON-OFF Controller Principle
On-Off control is the simplest form of feedback control. An on-off controller simply drives the manipulated variable from fully closed
Proportional Controller Principle
If the outflow (Qo) increases then the level in the tank will fall. The pressure sensed by the level transmitter, which
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
