Figure D

Installation

For general balancing it is sufficient to move the Pitot tube around in the duct and take an average or typical reading. Repeat this procedure in the other (supply or return) duct. (Fig. B.). Determine which duct has the highest airflow (highest reading on the gauge). Then damper that airflow back to match the lower reading from the duct. The flows should now be balanced.

Actual airflow can be determined from the gauge reading. The value read on the gauge is called velocity pressure.

The 6" duct has a cross sectional area of:

=(3.14 x [6"÷12]2) ÷ 4

=0.2 square feet

The airflow is then 640 ft./min x 0.2 square feet = 128cfm

For your convenience, the cross sectional area of some common round duct is listed below:

DUCT DIAM. (inches)	CROSS SECTION AREA (sq. ft.)
5.0	.14
6.0	.20
7.0	.27

The accuracy of the airflow reading will be affected by how close to any elbows or bends the readings are taken. Accuracy can be increased by taking an average of multi- ple readings as outlined in the literature supplied with the Pitot tube.

The Pitot tube comes with a chart that will give the air flow velocity based on the velocity pressure indicated by the gauge. This velocity will be either feet per minute or metres per second. To determine the actual airflow, the velocity is multiplied by the cross sectional area of the duct being measured.

This is an example for determing the airflow in a 6" duct. The Pitot tube reading was 0.025 inches of water. From the chart, this is 640 feet per minute.

Figure A:

Pitot Tube Air Flow Balancing Kit

c/w magnetic gauge, Pitot tube, hose and carry case. PART NO. 99-167

Figure B:

Pitot Tube and Gauge

Note: For best results, keep Pitot tube well away from dampers and motor turbulence.

Figure C:

Placement of the Pitot Tube

Pitot Tube

Note: For best results keep Pitot tube

well away from dampers.

*Note: All dampers & fittings must be covered with insulation and sealed with tape

60ELE specifications

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