Siemens SITRANS LVL200H Operating Instructions Manual page 18

Gas-tight leadthrough
18
do not use an overly long extension tube (optional) for SITRANS
LVL200H, instead check if it is possible to mount a short level switch
SITRANS LVL200H on the side of the vessel in horizontal position.
Extreme vibration caused by the process or the equipment, e.g. agita-
tors or turbulence in the vessel, can cause a long extension tube of
SITRANS LVL200H to vibrate in resonance. This leads to increased
stress on the upper weld joint. Should a longer tube version be neces-
sary, 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 of category
1G or WHG as well as to ship classifications. Make sure that the tube
is not subject to bending stress due to this measure.
Fig. 10: Lateral suppot of SITRANS LVL200H
The second seal of the gas-tight leadthrough (option) prevents an
uncontrolled leakage of the medium. The service life of the gas-tight
leadthrough depends on the chemical resistance of the materials.
See "Technical data".
Caution:
If it is determined (e.g. via an error message from SITRANS
LVL200H) that medium has already penetrated into the vibrating ele-
ment, the instrument must be exchanged immediately.
SITRANS LVL200H - Operating Instructions MAN-100048