CEMP-E
TI 810-11
30 November 1998
Proportional Band:
A controller parameter setting which
determines the change in the number of
engineering units of a process variable input
signal that will produce a full-scale change of
the controller analog output signal.
Proportional (P) Mode:
Control mode in which there is a continuous
linear relationship between the input and the
output.
Proportional-Integral (PI) Mode:
Control mode in which the output is
proportional to a linear combination of the
input plus a value proportional to the time
integral of the error between setpoint and
control point.
Proportional-Integral-Derivative (PID) Mode:
Control mode in which the output is a value
proportional to the input, plus a value
proportional to the time integral of the error
between setpoint and control point plus a
value proportional to the time rate of change
of the error.
PSI:
Pounds Per Square Inch
PSIA:
Pounds Per Square Inch, Absolute
PSID:
Pounds Per Square Inch, Differential
PSIG:
Pounds Per Square Inch, Gauge
PV:
Process Variable
R:
RA:
Return Air
Range:
The upper and lower limits of the value of a
variable.
Ratio:
A single-loop digital controller feature which
multiplies the remote setpoint input signal to
the controller by a constant and uses the
resulting value as the controller setpoint.
An electric device that changes the position
of its contacts when its coil is energized.
Remote Setpoint:
See Control Point Adjustment.
Resistance Temperature Detector (RTD):
A device whose resistance changes linearly
as a function of temperature.
REV:
Reverse-Acting
Glossary-10
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