LW2120
Electronic level sensor
14
5.2 Inclination
90°
1
Fig. 7: Inclination
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Mount the unit vertically (90°) to ensure a good echo from the
medium surface.
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Maximum inclination (1): 3° (Fig. Inclination).
5.3 Polarisation and orientation
The unit emits electromagnetic waves for level detection. The polarisation is the direction of the
electrical component of these electromagnetic waves.
1
2
3
4
α
5
Fig. 8: Polarisation visualised from
above
1:
tank wall
2:
level (medium to be detected)
3:
LW2x70 level sensor
4:
polarisation plane
5:
electrical M12 connector
α:
optimum angle between connector and tank wall = 45°
When the housing is rotated, the direction of polarisation changes and hence the influence of
the false echo on the measured value.
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Please keep this in mind when mounting or making changes later.
5.4 Beam angle and beam width
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Mount the unit with as few internal structures as possible within the signal beam.
D
W
α
Fig. 9: Beam angle and beam width
Beam angle (α): 10° (8° with antenna extension)
Beam width (W) as a function of the distance (D):
Distance (D)
Beam width 8° (W)
Beam width 10° (W)
2 m (6.6 ft.)
0.3 m (0.9 ft.)
0.4 m (1.2 ft.)
4 m (13.1 ft.)
0.6 m (1.8 ft.)
0.7 m (2.3 ft.)
6 m (19.7 ft.)
0.8 m (2.8 ft.)
1.1 m (3.5 ft.)
8 m (26.2 ft.)
1.1 m (3.7 ft.)
1.4 m (4.6 ft.)
10 m (32.8 ft.)
1.4 m (4.7 ft.)
1.8 m (5.8 ft.)
