KROHNE OPTISWITCH 3300C 2wire EN - Manual (Page 11)

The vibrating level switch is a measuring instrument and must
be treated accordingly. Bending the vibrating element will
destroy the instrument.
Warning:
The housing must not be used to screw in the instrument!
Applying tightening force on the housing can damage its
internal mechanical parts.
To screw in, use the hexagon above the thread.
4.2 Mounting instructions
Agitators, equipment vibration, etc., can cause the level switch
to be subjected to strong lateral forces. For this reason, do not
use an overly long extension tube for OPTISWITCH 3300 C,
but check if you can mount a short level switch on the side of
the vessel in horizontal position.
Extreme vibration caused by the process or the equipment, e.
g. agitators or turbulence in the vessel e.g. from fluidization,
can cause the extension tube of OPTISWITCH 3300 C to
vibrate in resonance. This leads to increased stress on the
upper weld joint. Should a longer tube version be necessary,
you can provide a suitable support or guy directly above the
tuning fork to secure the extension tube.
This measure applies particularly to applications in Ex areas.
Make sure that the tube is not subjected to bending forces
through this measure.
If OPTISWITCH 3300 C is mounted in the filling stream,
unwanted switching signals may be generated. Mount OPTI-
SWITCH 3300 C at a location in the vessel where no disturbing
influence from e.g. filling openings, agitators etc. can occur.
This applies particularly to instrument types with long
extension tube.
Handling
Agitators and fluidization
Inflowing medium
OPTISWITCH 3300 C - with two-wire output 11
Mounting
29963
-EN
-060830