VEGA VEGAPULS 56K - Manual (Page 22)

22 VEGAPULS 56K
22915-EN-041227
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Direct sensor vertically to the product surface
Correct Incorrect
Ladder
Ladder
Mounting and installation
Horn antenna: Correct and incorrect socket length
Correct Incorrect
Incorrect
Mounting on a vessel with parabolic tank top
Correct
~ 1 /
2
vessel
radius
Incorrect
>10 mm
3.5 Common installation mistakes
Socket piece too long
If the antenna 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 at least 10 mm out of the socket piece.
Wrong orientation to the product
Weak measuring signals are generated if the
sensor is not directly pointed at the product
surface. Orient the sensor axis perpendicu-
larly to the product surface to achieve opti-
mum measuring results.
Parabolic effects on dished or rounded
vessel tops
Round or parabolic tank tops act on the radar
signals like a parabolic mirror. If the radar
sensor is placed at the focal point of such a
parabolic tank top, the sensor receives am-
plified false echoes. The optimum mounting
location is generally in the range of half the
vessel radius from the centre.
10 mm