Application Note

4 Fluke Corporation Fundamental IAQ/HVAC measurements with the Fluke 975 AirMeter™
Fluke Corporation
PO Box 9090, Everett, WA USA 98206
Fluke Europe B.V.
PO Box 1186, 5602 BD
Eindhoven, The Netherlands
For more information call:
In the U.S.A. [phone] or
Fax [phone]
In Europe/M-East/Africa [phone] or
Fax [phone]
In Canada (800)-36-FLUKE or
Fax [phone]
From other countries [phone] or
Fax [phone]
Web access: http://www.fluke.com
©2006 Fluke Corporation. All rights reserved.
Specifications subject to change without notice.
Printed in U.S.A. 11/2006 2802154 A-EN-N Rev A
Fluke. Keeping your world
up and running.™
When the velocity function is
selected, the screen display
prompts the user to press a soft
key for either “Volume Flow
Rate” or “Air Velocity”. If “Air
Velocity” is selected, the AirMeter
screen displays a dynamic live
velocity reading at standard con-
ditions (69.98° F and 29.93 in
Hg). A soft key enables the user
to toggle between “Standard”
readings and “Actual” read-
ings, which are compensated for
pressure and temperature. The
“MIN MAX” function will record
the values to allow the user to
toggle between “Live”, “Maxi-
mum”, “Minimum”, and “Average”
velocities. Velocity readings can
be captured and saved if desired,
or logged at regular intervals for
trend analysis.
To calculate cfm (cubic feet per
minute) or M
3
/min (cubic meters
per minute), select “Volume
Flow Rate” from the velocity
main screen. The air volume
calculation is determined by the
velocity of the air and the area
of the duct (velocity x area =
air volume). In order to achieve
acceptable levels of accuracy,
volume calculations require an
average of multiple velocity read-
ings taken at stable points in an
accepted grid pattern across the
area of a duct or GRD. This is
referred to as a traverse, whether
the readings are taken within a
duct, or at the face of a GRD. The
meter can calculate air volume
based on an average of up to 99
velocity readings.
The evolution of IAQ
Today, the boundaries of IAQ
responsibilities are blurring
between professions that share
an interest in human and
building health. Is the indoor
environment contributing to
productive employees, attentive
students, patient recovery and
healthy buildings while reducing
the opportunity for structural
damage and microbial growth
or colonization? Research and
education are helping expand
the industry as are emotionally
driven speculation and litigation.
Monitoring and maintaining
comfortable, safe and healthy
IAQ fundamental values are an
essential process in the building
environments of today.
Measuring air flow at a supply register.