Siemens SITRANS L Operating Instructions Manual page 23

Installing/mounting
4.2 Mounting instructions
The polarization direction is marked on the housing, see following drawing:
1
Figure 4.1
Note
When the housing is rotated, the direction of polarization changes and hence the
influence of the false echo on the measured value. Please keep this in mind when
mounting or making changes later.
Reference point
The centre of the antenna lens is the beginning of the measuring range and at the
same time the reference point for the min./max. adjustment, see following diagram:
1
Figure 4.2
Installation position
When mounting the device, keep a distance of at least 200 mm (7.874 in) from the
vessel wall. If the device is installed in the center of dished or round vessel tops,
multiple echoes can arise. However, these can be suppressed by an appropriate
adjustment (see chapter " Set up").
If you cannot maintain this distance, you should carry out a auto false echo
suppression during setup. This applies particularly if buildup on the vessel wall is
expected. In such cases, we recommend repeating the auto false echo suppression at
a later date with existing buildup.
14
Marking of the polarisation
Position of the polarisation
Reference point
Reference point
Operating Instructions, 10/2022, 62711-76-01, A5E50352155
SITRANS LR150