NT 208D GB1
9 / 20
D
L
6
– PROBES INSTALLATION
– (General Procedures).
Unless specified and instructed otherwise in the order, refer to the probe data sheet
of the model used.
A dual-chord spool must always be constructed according to our guide drawing. Once
the structure has been made, verify the sizes “D
int
, L
1
& L
2
, D
1
& D
2
, d
1
& d
2
” as
built
Enter the results onto a sheet which will be used during the parameter adjustment.
! The final accuracy of the measurement depends on it.
The installation of the probes in a conduit should allow for the best the straight
lengths, particularly upstream, but also downstream, in order to benefit from a
predictable and stabilized hydraulic profile. Provide upstream a minimum of 15 times
the pipe diameter.
Similarly, to avoid the nuisance of deposits or accumulation of gas, planes close to
vertical (+/- 30°) will be avoided. A horizontal plane is a good choice excepted when
the conduit is vertical.
For intrusive probes, adjust the insertion then the alignment or orientation of the
probes for the same pair (> parallel faces).
For external probes, the freedom offered should not prompt the user to ignore
the above rules.
However, the choice of direct (\), reflex (V) or even (N or W) installation mode will
depend on the decision regarding the conduit (state) and the fluids to be measured.
Therefore, we advise initially a provisional installation known as a validation
installation (coupled with gel or grease) and final assembly (supports, solid coupling)
once the conditions have been validated.
Since the MiniSonic calculates for you the distance required between the probes, the
setting up operations will, in theory, take place once the converter parameters have
been set
Particular attention will be paid to cleaning the conduit at the probe location.
D.S.
D
L
