VEGA VEGAPULS 45 Profibus PA - Manual (Page 27)

VEGAPULS 42, 44 and 45 – Profibus PA 27
24908-EN-041227
3.5 Common installation mistakes
Socket piece too long
If the sensor is mounted in a socket exten-
sion that is too long, strong false echoes
arise which interfere with the measurement.
Make sure that the horn antenna projects out
of the socket piece.
< 135 mm
(250 mm)
Flange antenna: Correct and unfavourable socket
length
Flange antenna: Correct and unfavourable socket
length
Unfavour-
able
Correct Unfavourable
Correct
Reference
plane
75 %
0 %
100 %
Strong product movements
Strong turbulence in the vessel, e.g. caused
by powerful stirrers or strong chemical reac-
tions, can seriously interfere with the meas-
urement. A surge or bypass tube (see
illustration) of sufficient size always enables
reliable and problem-free measurement even
if strong turbulence occurs in the vessel,
provided there is no product buildup in the
tube.
Mounting and installation
Strong product movements
Correct Incorrect