Input3 Config Menu
Sup Pres Flow
Set Flow Station
Duct Area
The Duct Area item is used to program the cross sectional
area of the duct where the flow station is mounted. Since
the flow station is used to measure duct velocity, the Duct
Area is necessary to calculate the duct air flow.
NOTE: The DIM does not compute duct area. The area
must be first calculated and then entered into
the unit.
Use the following equations to calculate the duct area
(in ft
2
).
For round ducts
For rectangular ducts
0 to 50.00 ft
2
(0 to 4.6450 m
2
)
If the proper Duct Area is not programmed into the Model
RPC30, the flow measurement will be incorrect. Thus, all
the other information that uses the flow measurement, such
as the flow alarms, will also be incorrect.
Set Flow K-Factor
Adjustment
The K-Factor menu item sets the “K” factor for the flow
signal. The flow signal is multiplied by the K-Factor so that
the flow measurement matches the actual flow, determined
with a pitot tube traverse or other reference measurement.
NOTE: K-Factor modifies the entire range of the
calibrated flow, not just a single point.
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