Ultraflux Uf 841, User Manual

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NT UF 841 CP GB (d) / June 2015
4.3 Choosing the probe location
The installation depends on the type of probe.
4.3.1 Intrusive probes
Two geometric modes may be applied:
o
Diametric mode: The chord follows the diameter of the cross-section. An approach by Kh is then
activated in order to model he speed profile and refine the measurement. The Kh coefficient takes
account of the roughness of the wall and the viscosity of the fluid. You are strongly recommended
to refer to the teaching manual available on request in order to understand the significance of
these settings.
o
Parallel mode:
The chords are placed in parallel planes which "section" the
fluid speed flow better.
Note: The accuracy of the measurement is improved by increasing the number of chords.
Important: With a "simple" configuration, diametric mode must be used. Parallel mode is available from
"normal" configuration level.
For each chord, enter the length (in meters) between the faces of the two probes. To help you, read our
document “Ultrasonic transit time flowmeter”.
Also enter the projected length (Daxe) of this measurement relative to the axis of the pipe.