Fluke 922 Pitot Tube _ Инструкция онлайн
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2801989 December 2006 ©2006 Fluke Corporation. All rights reserved. Printed in U.S.A. 1
922 Pitot Tube
Instruction Sheet
Introduction
Use the 922 Pitot tube with the 922 Airflow Meter to
ensure accurate pressure, velocity, and flow
measurement.
Contacting Fluke
To contact Fluke, use one of the following telephone
numbers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-675-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
Or visit Fluke’s Web site at: www.fluke.com
.
Register the Meter at: http://register.fluke.com
Safety Information
WWarning
To avoid injury, or damage to the
Pitot Tube or 922 Airflow Meter,
follow these safety guidelines:
• Read the entire 922 Users
Manual before using the 922
Pitot Tube with the Meter.
• The Pitot Tube contains no
user-serviceable parts. For
service, return to Fluke. See
“Contacting Fluke”.
Measuring Air Velocity with Pitot
Tubes
Pitot tubes are commonly used to measure velocity
pressure within a duct. Velocity pressure is the
pressure resulting from moving air within a duct. As
air velocity increases, velocity pressure increases
accordingly. A Pitot tube is used to sense both total
pressure (TP) and static pressure (SP), which are used
to calculate velocity pressure (VP) according to the
following equation:
VP = TP-SP
Because airflow through a duct is turbulent and of
varying velocities, a single reading does not represent
the overall air velocity in the duct. Several readings
must be taken across a traverse plane, converted to
velocity, and then averaged. To take an accurate air
velocity measurement, the Log-Tchebycheff rule
provides the greatest uniformity because it accounts
for the friction effect of air moving near duct walls.
Figures 1 and 2 show the points along the traverse
plane where measurements should be taken, either in
rectangular or circular ducts.
Per the ASHRAE standard 111-1988, a minimum of
25 points should be measured in a rectangular duct
traverse. When traversing a duct side less than 18 in.
(450 mm), take readings from the center of equal
areas that are no more than 6 in. (150 mm) apart, with
a minimum of two points per side of the duct. See
Figures 1 and 2.
Refer to the 922 Users Manual for more information
about using the 922 Pitot Tube for measurements with
the 922 Airflow Meter.
Helpful Tips
• When performing a duct traverse, ensure the nose
of the Pitot tube is parallel to the duct wall and
facing the airflow.
• Take readings in long, straight runs of duct, where
possible. Avoid taking readings immediately
downstream of elbows or other obstructions in the
airway.
Содержание
- Contacting fluke 1
- Helpful tips 1
- Instruction sheet 1
- Introduction 1
- Measuring air velocity with pitot tubes 1
- Pitot tube 1
- Safety information 1
- Warning 1
- Pitot tube instruction sheet 2
- This fluke product will be free from defects in material and workmanship for two years from the date of purchase except for any pitot tube component if included with your product which is warranted for one year from the date of purchase this warranty does not cover fuses disposable batteries or damage from accident neglect misuse alteration contamination or abnormal conditions of operation or handling resellers are not authorized to extend any other warranty on fluke s behalf to obtain service during the warranty period contact your nearest fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the problem this warranty is your only remedy no other warranties such as fitness for a particular purpose are expressed or implied fluke is not liable for any special indirect incidental or consequential damages or losses arising from any cause or theory since some states or countries do not allow the exclusi 2
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