Mounting The Supply Airflow Pickup Tubes - KMC Controls BAC-5901C-AFMS Installation Manual

Mounting the Supply Airflow Pickup Tubes

There must be enough pressure flow pickup tubes must installed, for the size of the opening, to get an
accurate average value for the air-stream. Multiple pickup tubes (at least 2) connected in a parallel pitot array
are recommended.
The supply air pressure flow pickup tubes can be installed in one of three ways:
On the Supply Air Fan Bell (using SSS-1112/3/4) on page
y
On the Supply Air Fan Bell (using SSS-1115/6/7) on page
y
In the Supply Air Duct (using SSS-101x) on page
y
On the Supply Air Fan Bell (using SSS-1112/3/4)
1. Position the pickup tubes' mounting foot on the edge of the fan bell so that the ends of the tubes are
pointing toward the center of the fan inlet.
NOTE: All pickup points must be within the air-stream for accurate averaging of the differential pressure
flow. If the pickup tubes are too long, use a shorter model.
2. Attach the tubes to the fan bell using two self-tapping screws inserted through the 3/16" mounting holes.
3. Repeat steps 1 to 2 to mount the remaining pickup
On the Supply Air Fan Bell (using SSS-1115/6/7)
1. Position the pickup tubes so that the mounting feet span the fan inlet and all pickup points are within the
air-stream.
NOTE: All pickup points must be within the air-stream for accurate averaging of the differential pressure
flow. If the pickup tubes are too long, use a shorter model.
2. Attach the first mounting foot to the fan bell using two self-tapping screws inserted through the 3/16"
mounting holes.
3. Attach the second mounting foot to the opposite edge of the fan bell (or the strut) using two self-tapping
screws inserted through the 3/16" mounting cutouts.
4. Repeat steps 1 to 3 to mount the remaining pickup tubes.
In the Supply Air Duct (using SSS-101x)
NOTE: The pressure flow pickup tubes should be mounted in filtered air in the location of laminar flow,
which is about 6 straight duct diameters down the air duct.
1. Determine the duct's flow direction and install the pickup tubes based on the flow arrow imprint.
NOTE: The pickup tubes must be mounted with the arrow pointing in the direction of the airflow.
TrueFit Airflow Measurement System Installation Guide
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tubes.
6 925-019-05C