VEGA VEGASON 51V…53V - Manual (Page 36)

36 VEGASON 51 V … 53 V
Mounting and installation - Installation error
Sensor too close to the vessel wall
Sensor too close to the vessel wall
1 m 2 m 3 m 4 m 5 m
5 m
10 m
15 m
B
A
Max. meas.
distance
Distance of the
transducer to the
vessel wall
Curve 1 (liquids)
Curve 2 (solids)
If the sensor is mounted too close to the
vessel wall (dimension A in diagram) strong
false echoes can be caused. Build-up, rivets,
screws and weld joints superimpose their
echoes to the product echo or useful echo.
Hence note a sufficient distance of the sensor
to the vessel wall dependent on the max.
meas. distance (dimension B in diagram). In
case of good reflection conditions (liquids, no
vessel installation) we recommend to provide
the sensor distance according to
diagram
curve 1 . At a max. meas. distance of e.g.
10 m the distance of the transducer accord-
ing to curve 1 would be approx. 1 m.
In case of solids with bad reflection condi-
tions provide a distance to the vessel wall
according to
diagram curve 2 . With very
bad meas. conditions it can be necessary to
increase the distance to the vessel wall or to
gate out the false echoes additionally by a
false echo storage and hence to adapt the
sensor more precisely to the environment.
Correct Wrong