VEGA VEGAPULS 45 VBUS - Manual (Page 21)

VEGAPULS 42, 44 and 45 – VBUS 21
Flange connections on bypass tubes
Mounting and installation
VEGAPULS 45 with integrated measur-
ing tube
The sensor version VEGAPULS 45 is espe-
cially developed for measuring tube applica-
tions and is supplied complete with a 27 mm
measuring tube. With a measuring tube
length up to 4 m, this sensor version is suit-
able e.g. for the use in existing standpipes.
Seals on tube connections and tube ex-
tensions
Microwaves are very sensitive to gaps in
flange connections. If connections are made
without proper care, distinct false echoes as
well as increased signal noise can result.
Observe the following points:
• The seal used should correspond to the
tube inner diameter.
• If possible, conductive seals such as con-
ductive PTFE or graphite should be used,
especially for thicker seals.
• Make sure that there are only a few seal
positions on a conducting tube.
VEGAPULS 45 with integrated measuring tube in a
free vessel or in an existing bypass pipe
max
min
Adhesive products
For slightly adhesive products, choose a
surge pipe with e.g. a nominal width of
50 mm. VEGAPULS 42 and 44 radar sensors
with 26 GHz technology are relatively insensi-
tive to buildup in the tube. Nevertheless,
buildup must not be allowed to plug up the
tube completely.
For adhesive products, the use of a DN 80 to
max. DN 100 stand/surge pipe can enable
measurement in spite of buildup. Products
that cause excessive buildup cannot be
measured in a standpipe.
Note:
VEGAPULS 45 sensors with integrated
measuring tube are equipped with a
threaded process fitting or a flange connec-
tion. For sensors with threaded process
fitting, make sure that the complete sensor,
i.e. also the sensor housing, turns when
screwing in. The sensor housing is fastened
with a clipped connection. This sensor hous-
ing must not be turned with respect to the
measuring tube or even loosened. Otherwise
the radar signal coupling would be
destroyed and the sensor would not function
proberly.