VEGA VEGASON 51P…53P Profibus PA - Manual (Page 33)

VEGASON 51P … 53P 33
Mounting and installation
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)
Distance of the sensor from the vessel wall depend-
ing on the measuring distance (type 51 … 53)
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 de-
termining the sensor distance according to
. 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 poor reflective proper-
ties, determine the distance to the vessel wall
according to
. Under very
bad measuring conditions (rough vessel
walls, struts), it might be necessary to in-
crease the distance to the vessel wall, or to
also filter out the false echoes by storing
them in memory, thereby adapting the sensor
more precisely to the environment.