VEGA VEGAPULS 51K…54K Profibus PA - Manual (Page 16)

16 VEGAPULS 51P … 54P
24890-EN-041227
Mounting and installation
Rod antenna with thread on socket piece 1 1 /
2
“
Rod antenna with thread on 1 1 /
2
“ hole
≤ 60 mm or 100 m or
250 mm
Reference plane
Pipe antenna system in the tank
Type label
Vent hole
ø 5 … 10 mm
Surge pipe welded
to the tank Surge pipe in the
socket piece
As an alternative to socket mounting, the rod
antenna can also be mounted in round vessel
openings (threaded holes).
Rod antennas are available for the following
vessel openings: 1
1 /
2
“ NPT. DN 50 up to
DN 150. Take into account that the PTFE rod
antenna has only limited mechanical loading
capacity. If it is subjected to bending forces,
deformation or breakage can occur.
Rod antenna with thread
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.
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3.3 Measurement in standpipe
(surge or bypass tube)
General instructions
Measurement in a standpipe is preferred in
vessels which contain many installations, e.g.
heating tubes, heat exchangers or fast-run-
ning stirrers. Measurement is then possible
when the product surface is very turbulent,
and vessel installations can cause no false
echoes.
Due to the concentration of the radar signals
within the measuring tube, even products
with small dielectric constants (
ε
r
= 1.6 up to
3) can be reliably measured in surge or by-
pass tubes. Note the following instructions.
without deflector with deflector
min.
max.