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Ā©Retrotec 2017
The exterior of the inlet has the 4 self-referencing pressure pickups. They are connected to the green
Input B port, and are used as the reference for the Flow (Fan Pressure) Sensors. Self-referencing
ensures that the measured pressure difference is always accurate, no matter what the direction of flow
is with respect to the location of the gauge and operator and whether or not a flex duct is attached to
the inlet of the fan or not.
Figure 6: Self-referencing pressure pickup.
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