30 November 1998
A single-loop digital controller function which
maintains a fixed difference in engineering
units between controller setpoint and the
remote setpoint signal to the controller in
A phenomenon that results in valve damage
from too great a pressure drop through a
Cubic Feet Per Minute
Closed Loop System:
Control system configuration that allows
The instrument that receives the controller's
output signal and regulates the controlled
The temperature, humidity, or pressure value
to whose variations the controller responds.
Controlled variable is also called process
The instrument that measures the controlled
variable and responds by producing an
output signal that holds the controlled
variable within preset limits.
The change in the controller's output in
response to a measured change in the
controlled variable that is transmitted back to
the controller's input.
The actual value at which a controller is
holding a process variable.