Installation guide
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3
Installation and Operation Manual
Transmitter control
With transmitter control, the Vapor-logic
3
board receives a linear
signal that corresponds to the actual humidity level measured
in the space being controlled. (With a transmitter provided by
DRI-STEEM, the signal is 4 to 20 mA, which corresponds to
0 to 100% RH). The Vapor-logic
3
controller employs an internal
PID loop that uses this humidity measurement along with a
user–defined humidity set point to calculate a demand level. This
demand level is the level at which the humidifier will run. For more
information on the PID control loop, refer to Page 66.
Control input signals, continued
VL3_IOM.pdf 8 11/19/2009 9:11:05 AM