VEGA VEGASWING 83A - Manual (Page 17)

VEGASWING 81A and 83A 17
In the case of adhesive and viscous prod-
ucts, the tuning fork should protrude into the
vessel to avoid build-up. Sockets for flanges
and mounting bosses should not exceed a
certain length. For flange versions, the socket
should have a length of max. 40 mm, for
threads max. 30 mm, see also Mounting
boss.
Pressure
In the case of gauge or low pressure in the
vessel, the mounting boss must be sealed on
the thread. Cover the thr ead with Teflon tape,
hemp or something similar , or use a suf fi-
ciently resistant seal ring.
Vibrations
Extreme vibrations and shocks, e.g. by stir -
rers and turbulence in the vessel, can cause
resonance vibrations in the extension tube of
VEGASWING 83 A. This causes increased
wear on the upper weld joint.
Provide an appropriate fixing or fastening
directly above the tuning fork to fasten the
extension tube (see fig. 2.3).
This is mainly valid for applications in
Ex-area category 1G or WHG. Note
that the tube will not be bent by this
measure.
Stirrers
The level switch can be subjected to strong
lateral forces by stirrers etc. Therefore do not
choose too long an extension tube for
VEGASWING 83 A, but check whether it is
possible to mount a VEGASWING 81 A level
switch laterally in a horizontal position.
Cable entries
Use cable with a circular conductor cross-
section and tighten the cable entr y. The cable
entry is suitable for cable diameters of 4 mm
to 12 mm.
Two seal rings ar e attached to the instrument:
- for cable diameters of 4 … 9 mm
- for cable diameters of 5 … 12 mm.
Careful sealing of the cable entry is very
important when mounting outdoors, in humid
areas (e.g. for cleaning processes) or on
cooled or heated vessels (see fig. 2.4).
Humidity
Turn the cable entr y of horizontally mounted
instruments to the bottom to avoid humidity
ingress. The plastic housing can be rotated
by approx. 330 °. On vertically installed in-
struments loop the connection cable to the
instrument housing to the bottom, so that rain
or condensation can drain off. This is mainly
important when mounting outdoors, in humid
areas (e.g. for cleaning processes) or on
cooled or heated vessels (see fig. 2.4). When
lowering the housing cover checkthat the
transparent light guide (inspection glass) is
above the LED. When the housing cover is
lowered in the wr ong way, the switching point
of the sensor is no longer visible from outside
and the housing will not be perfectly sealed.
Mounting
Fig. 2.3