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Air Flow (Volume CFM/CMM)
1.
First measure and note the area of the duct or other passageway under test
in square feet or
square meters
. For rectangular ducts, area is calculated using
Length * Width
; for circular
ducts use
3.14 * R
2
.
2.
Enter the area value in the SETUP mode (refer to SETUP mode section for details).
3.
Select the Air Volume mode on the meter as described earlier using the FUNCTION key.
4.
Connect the hot wire probe to the meter’s probe jack (top right of meter) and slide open the
probe’s protective cover to expose the hot wire sensor. Close the protective cover when the
probe is not in use.
5.
Hold the probe by its handle and allow the air flow to pass through the sensor area. Note that
the air flow must face the probe’s colored dot. Refer to the meter and probe diagram section.
6.
The meter will display the air volume measurement in the upper display area and the selected
unit of measure (US or EU) in the lower display area (
F-US
for CFM;
F-EU
for CMM). CFM
represents cubic feet per minute and CMM represents cubic meters per minute.
Data Hold
To freeze a measurement on the display, press the HOLD key momentarily. The meter will emit a
beep, the reading will hold, and the HOLD display icon will switch on. Press the HOLD key again to
release the display and exit the Data Hold mode returning the meter to the normal operating mode.
MAX-MIN Readings
For a given measurement session, this meter can record the highest (MAX) and the lowest (MIN)
readings for later recall.
1.
Press the MAX-MIN key momentarily to access this mode of operation (REC icon appears)
2.
The meter is now recording the MAX and MIN readings.
3.
Press the MAX-MIN key again to view the current MAX reading (MAX icon appears). The
reading on the display is now the highest reading encountered since the REC icon was
switched on (when the MAX-MIN key was first pressed).
4.
Press the MAX-MIN key again to view the current MIN reading (MIN icon appears). The
reading on the display is now the lowest reading encountered since the REC icon was
switched on (when the MAX-MIN key was first pressed).
5.
To exit the MAX-MIN mode, press and hold the MAX-MIN key for at least 1.5 seconds. The
meter will beep, the REC-MAX-MIN icons will switch off, the memory will clear, and the meter
will return to the normal operating mode.
Display Backlight
To turn the display backlight ON or OFF, press and hold the backlight
key for at least 1.5
seconds. The meter will beep when switching the backlight ON or OFF unless the beeper is
disabled as described in the Setup Mode section of this user guide.
