VEGA VEGAPULS 51K…54K Profibus PA - Manual (Page 23)

VEGAPULS 51P … 54P 23
24890-EN-041227
Mounting and installation
0 %
~45˚
100,8
0,0…0,4
1,5…2
3,6
0,0…0,4 150…500
5…10
3,6
96 2
100 %
VEGAPULS 54
Flange DN 100
Connecting
sleeve
Welding neck
flanges
Welding of the smooth
welding neck flanges
Welding of the connect-
ing sleeves
Meas. pipe fastening
Vessel
bottom
Deflector
Rz ≤ 30
Deburr the
holes
Welding of the welding
neck flange
0 %
0 %
Quadrant pipe on the bypass tube end
Quadrant pipe on the standpipe end
If the vessel contains agitated products,
fasten the measuring pipe to the vessel bot-
tom. Provide additional fastenings for longer
measuring pipes.
In products with lower dielectric values (< 4),
a part of the radar signal penetrates the
medium. If the vessel is nearly empty, echoes
are generated by both the product and the
vessel bottom. The echo from the vessel
bottom can in some cases be stronger than
the echo from the product surface. If a de-
flector is installed below the open end of the
measuring tube, the radar signals are scat-
tered and prevented from reaching the ves-
sel bottom. This ensures that, in nearly empty
vessels or with products of low dielectric
value, the product delivers a more distinct
echo than the vessel bottom.
Due to the deflector, the useful signal and
meas. value in the nearly empty vessel are
distinct and clear - the 0 % level can thus be
reliably measured.
Instead of a deflector, the standpipe or surge
pipe can be equipped with a quadrant pipe
at the end. This quadrant pipe reflects the
radar signals that penetrate the medium
diffusely to the side and diminishes strong
echoes from the tube end or the vessel bot-
tom.