Problem

Match the following process control terms with their correct definition. TermDefinitionPr...

Match the following process control terms with their correct definition.

Term

Definition

Proportional gain

a. A condition that exists when a control loop is improperly designed, installed, or calibrated, or when the controller itself is not properly aligned. This condition will be observed by the process technician as a random behavior or cycling above and/or below the setpoint (desired control point).

Windup

b. A trend condition in which the process is in equilibrium and running smoothly producing a relatively straight line.

Offset

c. The amount of deviation of the controlled variable from the setpoint required to move the controller’s output through its entire range (expressed as 10 percent of span).

Tuning

d. A plot of a process variable over time.

Trend

e. The difference between the setpoint and the controlled variable under steady state (not changing) conditions.

Hunting

f. Setting the controller’s parameters of gain, reset, and rate (PID) lo optimize the control of the process variable.

Steady state

g. The saturation of the controller output signal to its minimum or maximum value if the process variable does not return to the setpoint.

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Solutions For Problems in Chapter 16