21
4 Mounting
NCR-84 Two-wire 4 … 20 mA/HART
51141-EN-181127
these can be suppressed by an appropriate adjustment (see chapter
"
Setup
").
If you cannot maintain this distance, you should carry out a false
signal suppression during setup. This applies particularly if buildup on
the vessel wall is expected. In such cases, we recommend repeating
the false signal suppression at a later date with existing buildup.
> 200 mm
(7.87")
Fig. 12: Mounting of the radar sensor on round vessel tops
In vessels with conical bottom it can be advantageous to mount the
sensor in the centre of the vessel, as measurement is then possible
down to the bottom.
Fig. 13: Mounting of the radar sensor on vessels with conical bottom
The measuring range of VEGAPULS 64 begins physically at the end
of the antenna. The min./max. adjustment, however, begins at the
reference plane. The reference plane is different depending on the
sensor version.
•
Plastic horn antenna:
The reference plane is the sealing surface
on the lower edge
•
Thread with integrated horn antenna:
The reference plane is
the sealing surface at the bottom of the hexagon
•
Flange with encapsulated antenna system:
The reference
plane is the lower edge of the flange plating
•
Hygienic fittings:
The reference plane is the highest contact point
between sensor process fitting and welded socket
Reference plane
925-0373 Rev A
