User Manual

38 VEGAPULS 42 and 44 – 4 … 20 mA
Mounting and installation
Pipe antenna systems in the tank
Type label
Vent hole
ø 5 … 10 mm
Surge pipe welded
to the tank
Surge pipe in the
socket piece
Surge pipes which are open at the bottom
must extend over the full measuring range
(i.e. down to 0% level), as measurement is
only possible within the tube.
4.3 Measurement in standpipe
(surge or bypass tube)
General instructions
Pipe antennas are preferred in vessels which
contain many installations, e.g. heating tubes,
heat exchangers or fast-running stirrers.
Measurement is then possible where the
product surface is very turbulent, and vessel
installations cannot cause false echoes.
Due to concentration of the radar signal within
the measuring tube, even products with small
dielectric constants (e
r
= 1.6 up to 3) can be
reliably measured in surge or bypass tubes.
Please note the following instructions.
without deflector
with deflector
min.
max.
Screw-on antenna directly in vessel opening
Screw-on antenna directly in vessel
opening
As an alternative to socket mounting, the
screw-on antenna can be mounted in round
vessel openings (holes).