VEGA VEGAPULS 43 4 … 20 mA; HART compact sensor - Manual (Page 22)

22 VEGAPULS 43 – 4 … 20 mA
26626-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.
Flange antenna: Correct and unfavourable socket
length
Correct
Unfavourable
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.
Correct Incorrect
Buildup
Correct Incorrect
Inflowing material
Correct
Incorrect
Inflowing material
Do not mount the instrument in or above the
filling stream. Ensure that you detect the
product surface and not the inflowing mate-
rial.
Buildup
If the sensor is mounted too close to the
vessel wall, product buildup and other de-
posits on the vessel wall cause false echoes.
Position the sensor at a sufficient distance
from the vessel wall. Please also note chapter
"3.1 General installation instructions“.
Mounting and installation