Model 451181 Version 3.0 07/06
6
Air Volume Measurements
Air Volume (CFM / MM) measurements require that the area of the duct or other enclosure
be known. The meter can calculate the area of rectangular and circular ducts or the user
can calculate the area and enter it manually. See details below:
1.
Measure (in inches) the diameter of a circular duct or the length/width of a
rectangular duct. Optional: Calculate the duct area.
2. Press
F1
MEAS
from the WELCOME screen.
3. Press
F2
INPUT
softkey.
4.
If the area (in square inches) has been manually calculated, press AREA and enter
the value using the numeric keypad; Press
ENTER
, then proceed to step 6.
Otherwise continue with step 5.
5.
For rectangular ducts, press
LxW
(length x width) and enter the length (in inches)
of the duct (using the numeric keypad). Press
ENTER
and do the same for the
width. Press
ENTER
after the width is programmed. For circular ducts, press the
D
(diameter) key. Enter the duct’s diameter (in inches) using the numeric keypad and
then press
ENTER
.
6.
Take an air velocity measurement as previously described.
7.
Read the CFM or CMM Air Volume measurement on the LCD.
