Fluke 975 AirMeter - Measuring Volume Flow Rate

975
Users Manual
14
5. Press 2[Capture] to capture the standard velocity
reading, 1[Actual] to change to the actual velocity
menu, or 3[Back] to return to the velocity menu.
Note
In this case, pressing 2[Capture] does not
create a single point data log, it simply freezes
the display reading.
6. If the standard reading was captured, press
1[Actual] to view the actual air velocity reading,
7. Press 3[Done] to return to the velocity menu.
Measuring Volume Flow Rate
The formula for measuring the air flow volume rate is to
multiply the area of the air-duct opening by the average
velocity of the air. The Meter does the computation after
the variables are entered.
To measure the volume flow rate:
1. Attach the velocity probe.
2. Press Vto access the velocity menu. The probe
will initialize.
3. Press 1[Volume Flow Rate].
4. The volume flow rate screen appears. Select the duct
type matching that being measured:
• 1[Rectangle Duct]
• 3[Round Duct]
• 2[Other] to manually enter the area number
Choose measurement units in inches (if the Meter is set
to Metric measurements, enter units in centimeters).
5. Enter the duct measurements:
• If 1[Rectangle Duct] is pressed, enter the x
(length) and y (height) measurements using the
up and down arrows. Press 3 [ENTER X] or
[ENTER Y] once each measurement is entered.
• If 3[Round Duct] is pressed, use the up and
down arrows to enter the duct’s diameter.
6. Place the wand sensor perpendicular to the air
stream being measured with the white dot facing into
the air stream.
7. Press 1[Capture]. The standard velocity flow rate
measurement is displayed. Continue capturing
samples as needed.
Note
The Meter can take up to 99 samples.
8. When all samples have been captured, press
3[Calculate Flow]. The standard velocity volume
flow rate is displayed.
9. Press 2[Actual]to view the actual velocity volume
flow rate.
10. Press 3[Back] to return to the flow rate sample.
11. Press 1[Done]to return to the the Velocity menu.