Model 407119 Version 1.3 April 2004
5
Air Flow Measurements (CMM / CFM)
NOTE: Temperature is not displayed in the FLOW mode.
1. Perform the Initialization and Zero described earlier.
2. Select the FLOW mode using the FLOW/VELOCITY button. The LCD will display
FLOW when the flow function has been selected.
3. Select the desired air flow units: CMM (cubic meters per minute) or CFM (cubic feet
per minute) using the UNIT button. The LCD will reflect the selection.
4. Calculate the area of the duct or vent in square feet (not inches) or meters.
5. Press the AREA button to begin entering the area in m
2
or ft
2
. The left digit will begin
flashing.
Use the ► button to select the digit to set.
Use the ▲ button increase the value of the flashing digit
Use the ▼ button to decrease the value of the flashing digit
Use the ● RECORD/RECALL button to set the decimal point.
Press the ENTER/RESET button to save the area.
When the area has been entered, the bottom display will indicate the area entered in ft
2
or m
2
.
6. Insert the probe into the area to be measured and the display will display the airflow.
The main LCD displays the air flow in CFM or CMM.
Flow Modes
For air flow measurements, three modes apply: Press the FLOW MODE button to select
one of the modes
NORMAL MODE, default mode, where the actual flow is indicated.
2/3V MAX MODE: LCD displays 2/3 the measured value.
AVG MODE: Up to 20 readings can be taken separately and averaged. Select the AVG
mode via the FLOW MODE button and then press the AVG START button to take a
reading. Up to 20 readings can be taken and averaged. The lower LCD display
provides a 1 to 20 counter that increments each time a reading is taken. The main LCD
displays the averaged air flow.
Data Hold Feature
1. While taking measurements, press the HOLD button to freeze a reading.
2. The HOLD indicator will appear on the LCD when the display is in Data Hold mode.
3. Press HOLD again to return to normal operation.
Maximum and Minimum Recording
The RECORD/RECALL feature allows the user to record and view the highest (MAX) and
lowest (MIN) readings.
1. Press the RECORD/RECALL button once. The REC indicator will appear on the
display and the meter will begin keeping track of the MAX and MIN values.
2. To view the MAX reading, press RECORD/RECALL again. The MAX indicator along
with the maximum reading will appear on the LCD display.
3. Press RECORD/RECALL again to view the minimum value, the MIN indicator along
with the minimum reading will appear on the LCD display.
4. To return to normal operation, press and hold the RECORD/RECALL button for
approx. 3 seconds. The display indicators REC, MAX, and MIN will disappear.
Note: Auto Power Off is disabled in the RECORD mode.
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