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TM
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Page <10>
V1.0
12/04/18
5-12. Measuring Velocity
The Meter uses standard ambient conditions (temperature=21.1°C/70°F, barometric pressure= 14.7 PSI / 1013 mbar), to
approximate actual velocity and flow. The primary display number is air velocity, the device measures air velocity, and it
features 5 selectable units of velocity measure: m/s, ft/min, km/h, MPH, knots.
• Press
“P/V/F”
to enter Velocity mode and press
“Unit ”
to select unit.
•
Connect the hoses to the pitot tube and to the Meter. The “Input(+)” pressure port on the Meter connects to the white hose
from the total pressure connection of the pitot tube. The “Ref (-)” pressure port on the Meter connects to the black hose
from the static pressure connection of the pitot tube. The tubing open to ambient conditions press and hold
“Hold/Zero”
for
2 seconds to zero out the display.
•
When make the measurement, the pitot tube tip should against the measured wind as shown in upper figure, and ensure
that the axis of the duct is aligned with the fluid flow for ±10°. If Measure Velocity measures negative and show “Error” on
the display, check to make sure that the hoses are attached to the correct ports on the Meter and the pitot.
5-13. Measuring Flow
• Press
“P/V/F”
to enter air flow mode and press
“Unit ”
to select unit ..
•
The Meter shows the duct shape and size. The Meter stores the last duct shape and size that is entered. If the duct is
different than the stored version, press
“Setup
”
button to find the proper duct type for the measurement (rectangular or
round). Refer to Step duct shape and parameters setting .. (“Changing Setup Options.”)
Note:
HOLD, Save, MIN/MAX/AVG, Zero, and Setup can be used when measuring pressure, velocity and flow.