10 HD350-en-GB_V3.4 2/19
Air Flow (Volume) Measurements
1. Press the P/V/F button to enter the Air Flow (Volume) mode (FLOW will appear on the LCD).
The Primary display area will show the Air Flow measurement.
2. Use the UNIT button to select the desired unit of measure (CMM or CFM).
3. To view the currently programmed duct area and shape:
Press the P/V/F button three more times to access the duct size/dimensions display. The
duct shape selection (rectangle or circle) will appear on the lower left-hand area of the LCD
and the Area value will be shown above it.
For Circular ducts, the Diameter (D) of the duct will be shown.
For Rectangular ducts, the Width value (W) will be shown first; press the P/V/F button again
to switch to the Height (H) value display.
Note that the Meter stores/displays the last duct shape and size programmed by the user.
To change the duct size and/or shape refer to the earlier SETUP MODE section.
Press the P/V/F button again to return to the AIR FLOW screen.
4. Now take an air velocity measurement as described in the previous section on Air Velocity
(ignoring the unit of measure discussions). The meter will display Air Flow (Volume) in Cubic
Feet per Minute (CFM) or Cubic Meters per Minute. The meter calculates Air Volume (Flow) by
measuring Air Velocity and taking into account the area of the duct.
Ambient Temperature Measurements
The Secondary display area (top right of LCD) indicates the ambient temperature sensed by the
thermometer located at the top middle of the meter (between the two pressure connection posts).
To change the displayed unit of measure for Temperature, use the F/C button.
The only instances where the Secondary display area will not indicate temperature are when the
meter is in the SETUP mode or when the Elapsed Timer is shown.
Additional Functions
Data Hold
1. Press the HOLD ZERO button to freeze the presently displayed reading on the display. The
display will show the HOLD icon while in the Data Hold mode.
2. Press the HOLD ZERO
to real time operation.
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