User Manual

44 VEGAPULS 42 and 44 – 4 … 20 mA
Mounting and installation
Guidelines for standpipe construction
Radar sensors for measurement on surge or
bypass pipes are routinely mounted in flange
sizes DN 50, DN 80, DN 100 and DN 150.
The radar sensor with a DN 50 flange forms a
functional measuring system only in conjunc-
tion with a measuring pipe.
The illustration on the left shows the construc-
tional features of a measuring pipe (surge or
bypass tube) as exemplified by a sensor
with DN 50 flange.
The measuring pipe must be smooth inside
(average roughness Rz £ 30). Use stainless
steel tubing (drawn or welded lengthwise) for
construction of the measuring pipe. Extend
the measuring pipe to the required length
with welding neck flanges or with connecting
sleeves. Make sure that no shoulders or
projections are created during welding. Be-
fore welding, join pipe and flange with their
inner surfaces flush and exactly fitting.
Avoid welding through the pipe wall. The pipe
must remain smooth inside. Roughness or
welding beads on the inner surfaces must be
carefully removed and burnished, as they
cause false echoes and encourage product
adhesion.
The following illustration shows the construc-
tional features of a measuring pipe as exem-
plified by a radar sensor with DN 100 flange.
Radar sensors with flanges DN 80,
DN 100 and DN 150 are equipped with a
horn antenna. With these sensors, a plain
welded flange can also be used on the sen-
sor end instead of a welding neck flange.
0 %
~45˚
ø 51,2
0,0...0,4
1,5...2
2,9
0,0...0,4
150...500
5...10
2,9...6
100 %
VEGAPULS 42
Connection
sleeves
Welding neck
flanges
Welding of the connect-
ing sleeve
Welding of the welding
neck flange
Meas. pipe fastening
Vessel bottom
Deflector
Min. product level to be
measured (0 %)
Deburr the
holes
G 1
1
/
2
A screwed
antenna