Siemens SITRANS LVL200E Instrukcja obsługi - Strona 15
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Inflowing medium
Flows
Agitators
SITRANS LVL200E - CONTACTLESS ELECTRONIC SWITCH
If the instrument is mounted in the filling stream, unwanted false
measurement signals can be generated. For this reason, mount the
instrument at a position in the vessel where no disturbances, e.g. from
filling openings, agitators, etc., can occur.
This applies particularly to instrument types with long extension tube.
Fig. 8: Inflowing medium
To minimise flow resistance caused by the tuning fork, SITRANS
LVL200E should be mounted in such a way that the surfaces of the
blades are parallel to the product movement.
Due to the effects of agitators, equipment vibration or similar, the level
switch can be subjected to strong lateral forces. For this reason, do not
use an overly long extension tube for SITRANS LVL200E, 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, can cause the extension tube of
SITRANS LVL200E 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 directly above the
tuning fork to secure the extension tube.
This measure applies mainly to applications in Ex areas category 1G or
WHG. Make sure that the tube is not subject to bending stress due to
this measure.
4 Mounting
15