VEGA VEGASON S 61 - Handbuch (Seite 25)

Make sure that a min. distance - the so called dead
zone - below the reference plane is maintained in
which a measurement is not possible. The exact
value of the dead zone is stated in chapter
"Technical data" in the "Supplement".
1 3 2
100%
0%
Fig. 18: Measuring range (operating range) and max. measuring
distance
1 Dead zone (min. measuring distance)
2 Dead zone (max. measuring distance)
3 Measuring range
4 Reference plane
Pressure/Vacuum
Gauge pressure in the vessel does not influence
VEGASON S 61. Low pressure or vacuum does,
however, damp the ultrasonic pulses. This influ-
ences the measuring result, particularly if the level
is very low. With pressures under -0.2 bar (-20 kPa)
you should use a different measuring principle, e.g.
radar or guided microwave.
3.2 Mounting instructions
Screwing in
Screw VEGASON S 61 into the mounting socket
with an appropriate spanner applied to the hexagon
of the process fitting. Max. torque see chapter
"Technical data".
Warning:
The housing of the threaded versions must
not be used to screw the instrument in!
Applying tightening force on the housing
can damage its rotational mechanical parts.
Installation position
When mounting VEGASON S 61, keep a distance
of at least 200 mm (7.874 in) to the vessel wall. If
the sensor is installed in the center of dished or
round vessel tops, multiple echoes can arise.
These can, however, be suppressed by an
appropriate adjustment (see "Setup").
If you cannot maintain this distance, you should
carry out a false signal suppression during setup.
1
2
> 200 mm
Fig. 19: Mounting on round vessel tops
1 Reference plane
2 Vessel center or symmetry axis
In vessels with conical bottom it can be advanta-
geous to mount the sensor in the center of the
vessel, as measurement is then possible down to
the lowest point of the vessel bottom.
Fig. 20: Vessel with conical bottom
VEGASON S 61 25
Mount
32944
-02
-070301