30 November 1998
Deviation Contact (DEV):
A single-loop digital controller output contact
that can be configured to respond to a given
difference between the setpoint of the
controller and the process variable input
The difference in values of the controlled
variable that will cause a two-position
controller to change its output.
The difference between the static pressures
measured at two points in an HVAC system.
An output signal that changes in the same
direction as the controlled or measured
variable. An increase in the controlled or
measured variable results in an increase in
the output signal.
The control system mode of operation in
which outside air is used for free-cooling of