VEGA VEGAPULS 45 4 … 20 mA; HART compact sensor - Manual (Page 24)

24 VEGAPULS 42, 44 and 45 – 4 … 20 mA
< 135 mm
(250 mm)
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 are
generated which interfere with the measure-
ment. Make sure that the horn antenna pro-
trudes out of the socket piece.
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 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
Correct Incorrect