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Description
3.4 Theory of Operation
FUG1010 IP65 NEMA 4X
Operating Instructions, 01/2013, A5E02951519-AC
27
R
①
Velocity of Sound
②
Flow Vector
③
Pipe ID
④
WideBeam Sensors
∅= sin
1
(VOS / V
phase
)
Where:
VOS = Velocity of sound in liquid
V
phase
= Phase velocity of sensor
T
L
= 2 * ID / (VOS * cos ∅)
ID = Pipe inside diameter
T
L
= Transit time in liquid
V
F
= V
phase
* DT / (2 * TL)
DT = Measured Transit-Time difference
V
F
= Flow Velocity
Flow Profile Compensation
The flow equation shown above is only valid for "plug" flow, where the flow velocity is
uniform across the entire cross-section of the pipe. Frictional forces between the fluid and
the pipe wall cause the flow velocity to be nearly zero at the pipe wall and peaked toward the
center of the pipe (as shown in the diagram below).
The acoustic beam traverses the center of the pipe and therefore must account for the
influence that flow profile has on the line integration through a round pipe. The shape of this
flow profile (for fully developed flow) is defined by the Reynolds number.
Содержание FUG1010 IP65 NEMA 4X
Страница 9: ...Table of contents FUG1010 IP65 NEMA 4X 8 Operating Instructions 01 2013 A5E02951519 AC ...
Страница 23: ...Safety notes 2 6 Certificates FUG1010 IP65 NEMA 4X 22 Operating Instructions 01 2013 A5E02951519 AC ...
Страница 93: ...Commissioning 6 3 Installation Menus FUG1010 IP65 NEMA 4X 92 Operating Instructions 01 2013 A5E02951519 AC ...
Страница 143: ...Service and maintenance 9 4 Battery disposal FUG1010 IP65 NEMA 4X 142 Operating Instructions 01 2013 A5E02951519 AC ...
Страница 165: ...Troubleshooting 10 5 Force Transmit FUG1010 IP65 NEMA 4X 164 Operating Instructions 01 2013 A5E02951519 AC ...
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Страница 237: ...21614 C 1011NFPS 7 ...
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Страница 246: ...21614 C ...
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Страница 249: ...1012TN 7 INSTALLATION DRAWING 1010 SERIES TRANSDUCERS AND MOUNTING TRACKS 21614 C ...
Страница 250: ...1012TN 7 INSTALLATION DRAWING 1010 SERIES TRANSDUCERS AND MOUNTING TRACKS 21614 C ...
Страница 251: ...1012TNH 7 INSTALLATION DRAWING 1010 SERIES TRANSDUCERS AND MOUNTING TRACKS 21614 C ...
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Страница 266: ...Glossary FUG1010 IP65 NEMA 4X 200 Operating Instructions 01 2013 A5E02951519 AC ...
Страница 270: ...Index FUG1010 IP65 NEMA 4X 204 Operating Instructions 01 2013 A5E02951519 AC ...