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To display the real-time airflow volume measurement

associated with a real-time air speed measurement at a

single point, press the MODE button. Note that doing so

1) causes the word FLOW to appear on the top line of the

upper readout and 2) changes the unit at the right of the

displayed value from fpm to cfm (an abbreviation of cubic

feet per minute, or ft

/min).

To return to displaying the air speed at the single point, press

the MODE button again. Note that doing so 1) causes the

indicator vel to replace FLOW on the top line and 2) changes

the unit at the right of the displayed value from cfm to fpm.

To display the average, minimum or maximum airflow

volume at a single point, follow the procedures in the section,

Recording Air Speeds at a Single Point, on pp. 11 – 13 that

ultimately produce the display shown in Fig. 4. Then press the

MODE button to generate the free area display screen. If the

area requires adjustment, now is the time to change its value

using Fig. 7 and the procedures at the beginning of this

section as guides.

Once the area is correct as displayed, press the MODE button

again to convert the average air speed value in fpm to an

average airflow volume value in cfm. Pressing the MIN/MAX

REC SINGLE-POINT button again switches the display to

showing real-time measurements—in this case,

measurements of airflow volume. As with air speed

measurements, each subsequent press of the MIN/MAX REC

General DCFM8906 User Manual

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