VEGA VEGASWING 83A EXD - Manual (Page 16)

16 VEGASWING 81A EXD and 83A EXD
n case of adhesive and viscous products,
the tuning fork should protrude into the ves-
sel to avoid build-up. Sockets for flanges and
mounting bosses should not exceed a cer -
tain length. For flange versions, the socket
should have a length of max. 40 mm, for
threads max. 30 mm, see also Welded
socket.
Pressure
In case of gauge or low pressure in the ves-
sel, the mounting boss must be sealed on the
thread. Cover the thr ead with Teflon tape,
hemp or similar or use a sufficiently resistant
seal ring.
Vibrations
Extreme vibrations and shocks, e.g. by stir -
rers and turbulences in the vessel, can
cause the extension tube of VEGASWING
83A EXD to resonance vibrations. This
causes an 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 2G or WHG. Note
that the tube will not be bent by this
measure.
Stirrers
Due to stirrers or similar the level switch can
be subjected to strong lateral forces. Due to
this do not choose a too long extension tube
of VEGASWING 83A EXD but check if it is not
possible to mount a VEGASWING 81A EXD
level switch laterally in horizontal position.
EExd-cable entries
Use cable with a round cross-section area of
conductor and tighten the cable entr y. The
EExd-cable entry is suitable for cable diam-
eters of 3,1 mm to 8,7 mm.
The careful sealing of the cable entry is very
important when mounting outside, in humid
areas (e.g. by cleaning processes) or on
cooled or heated vessels (see fig. 2.4).
VEGASWING with relay oscillator SWING
E82R can be equipped with a second EExd-
cable entry. This is attached to the instru-
ment. Exclusively use for EExd approved
cable entries.
• Loosen the blind stopper and remove it.
• Screw the cable entry into the housing and
tighten the cable entr y.
Humidity
Turn the cable entr y of horizontally mounted
instruments to the bottom, to avoid humidity
ingress. The plastic housing can therefore be
rotated by approx. 330 °. On vertically in-
stalled instruments loop the connection line to
the instrument housing to the bottom, so that
rain or condensation water can drain off. This
is mainly valid for mounting outside, in humid
areas (e.g. by cleaning processes) or on
cooled or heated vessels (see fig. 2.4).
Mounting
Fig. 2.3