TERM USED IN CONTROL SYSTEM PROCESS

2)TERM OF PROCESS CONTROL :

• Process variable - The actual value in the control loop, temperature, pressure, flow, composition, pH, etc

• Set point - The set point is the desired value of the process variable

• Error - In the control loop the error = set point - process value

• Controller - Output signal from the controller.

• Measurement - Measurement is the same as the process value.

• Alternating Current - Electrical current that reverses its direction of flow at regular intervals

• Calibration - The comparison of a measuring device (an unknown) against an equal or better standard

• Delay - A term commonly used in stead of dead time

• Deviation - Any departure from a desired or expected process value

• Mode - The controller can be set in auto, manual, or remote mode