VEGA VEGAPULS 56 Profibus PA - Manual (Page 30)

30 VEGAPULS 56 Profibus PA
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
0 %
~45˚
ø 51,2
0,0…0,4
1,5…2
2,9
0,0...0,4
150…500
5…15
2,9…6
100 %
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 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 radar sensor with a DN 50 flange only
forms a functioning measuring system in
conjunction with a measuring tube.
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. If the welding
process inadvertently reaches the inner
surface, any resulting roughness or welding
beads must be carefully removed and bur-
nished, as these cause false echoes and
encourage product adhesion.
Flange DN 50
Welding neck flange
Connection
sleeves
Welding neck
flanges
Welding of the connect-
ing sleeve
Welding of the welding
neck flange
Meas. pipe fasten-
ing
Vessel bottom
Deflector
Min. product level
to be measured
(0 %)
Rz ≤ 30
Deburr the
holes