VEGA VEGASON 54V…56V - Manual (Page 37)

VEGASON 54V … 56V 37
2 m 4 m 6 m 8 m
10 m
20 m
30 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. Buildup, rivets,
screws or weld joints on the vessel wall su-
perimpose their echoes to the product or
useful echo. Please ensure the sufficient
distance of the sensor to the vessel wall,
depending on the maximum measuring dis-
tance (dimension B in diagram). In case of
good reflection conditions (liquids, no vessel
installations), we recommend determining the
sensor distance according to
Diagram curve
1 . At a max. meas. distance of e.g. 10 m, the
distance of the transducer (according to
curve 1) should be approx. 1.5 m. In case of
solids with bad reflection properties, deter-
mine the distance to the vessel wall accord-
ing to
Diagram curve 2 . Under very bad
measuring conditions (rough vessel walls,
struts), it might be necessary, to increase the
distance to the vessel wall, or to filter out the
false echoes in addition by storing them in
memory, thereby adapting the sensor more
precisely to the environment.
Mounting and installation
Strong heat fluctuations
Strong heat fluctuations, e.g. due to the sun,
cause measuring errors. Please provide a
sun shield.
Min. distance to the medium
If the min. distance to the medium is not main-
tained, the instruments show wrong meas-
ured values. Mount the instrument at the
required min. distance.
Sensor too close to the vessel wall
Sensor too close to the vessel wall
Correct Wrong
Strong heat fluctuations
Shield