NT228B GB2
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D
.
S
If you are using intrusive/wetted probes
, adjust the insertion and then the
alignment or orientation of the probes for the same pair (up to have parallel
faces). L is the exact distance between probes face to face and D is the projection
part of L that is concerned with the flow: (L – 2 * lo) * Cos (angle)
With external probes
, the flexibility does not exempt the user to ignore the
above rules.
The choice of a Direct (\), Reflex (V), the more common, or N / W installation
mode will depend on your decision regarding the pipe dimensions and internal /
external conditions, and also the flowing fluid to be measured.
From the entered data and selected probe characteristics, the UF 801-P calculates
the distance D.S required between these probes.
Particular attention should be paid to cleaning the pipe at the probe location and
to ensure the coupling surface is clean and smooth.
The 4 installation modes are:
Direct mode
(when difficult conditions)
Reflex
mode
(the more commonly used)
N mode
(less pipe wall noise effect)
W mode
(very small pipes)
