CEMP-E
TI 810-11
30 November 1998
Reverse Acting:
An output signal that changes in the opposite
direction from the controlled or measured
variable. An increase in the controlled or
measured variable results in a decreased
output signal.
RF:
Return Fan
RH:
Relative Humidity
RHC:
Relative-Humidity Controller, Reheat Coil
RHT:
Relative-Humidity Transmitter
RHY:
Humidity Loop Device
SA:
Supply Air
SAT:
Saturday
Schematic:
A diagram that shows the relationship of
control devices to control loops and shows
the relationship of control loops to systems.
SCIM:
Standard Cubic Inches Per Minute
Self-Tuning:
A single-loop digital controller feature that,
when selected, commands the controller to
calculate the optimal proportional, integral
and derivative mode constants for the
process being controlled and to use the
calculated constants for control.
Sensitivity:
The unit change in controller output per unit
change in the controlled variable. Usually
expressed in psi or milliamps per degree,
cfm, etc.
Sensing Element:
A device used to detect or measure physical
phenomena.
Sequence of Operation:
A narrative that describes the actions of
control devices such as valves and dampers
as the process variable changes in a given
direction, such as on a temperature,
humidity, or pressure increase.
Setpoint:
The desired value of the controlled variable
at which the controller is set.
SF:
Supply Fan
SHLD:
Sunshield
Glossary-11
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