Consider a typical process control system. For a particular example let us look at an open tank, which supplies a process,…
On-Off control is the simplest form of feedback control. An on-off controller simply drives the manipulated variable from fully closed…
If the outflow (Qo) increases then the level in the tank will fall. The pressure sensed by the level transmitter, which…
Reset of Integral Action Most of the processes we will be controlling will have a clearly defined setpoint. If we wish…
RATE OR DERIVATIVE ACTION Consider a control system subjected to a disturbance, which causes the error to increase in a ramped…
Drum Level Control Systems are used extensively throughout the process industries and the Utilities to control the level of boiling…
The Below Figure depicts the control scheme for single-element drum level control. In this configuration, only the water level in…
A two-element drum level control system is capable of providing close adherence of drum level to its set-point under steady-state…
In most drum level control applications, the two-element drum level control will maintain the required water/steam interface level – even…
Instrument Engineers Interview Questions, Control Room Interview Questions, Field Instruments Questions and Answers, Instrumentation Questions & Answers.
