Electronic level sensor
LW2720
15
6.2 Inclination
90°
1
Fig. 7: Inclination
u
Mount the unit vertically (90°) to ensure a good echo from the
medium surface.
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Maximum inclination (1): 3° (Fig. Inclination).
6.3 Non-metallic tanks
Non-metallic tanks are, for example, fibreglass tanks.
Nearby objects outside the tank may cause disturbing radar echoes as such materials may
allow radar waves to pass through. Corrective measures:
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The unit should be positioned so that objects close to the tank are kept outside the signal
beam.
When installed in non-metallic tanks, there may be deterioration caused by electromagnetic
interference from other devices. Corrective measures:
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Apply a shielding screen / metal foil between the level sensor and other electrical devices.
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Additional installation in a metal pipe. Consider the beam angle of the unit when selecting a
pipe diameter.
6.4 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. 8: Beam angle and beam width
Beam angle (α): 10°
Beam width (W) as a function of the distance (D):
Distance (D)
Beam width (W)
2 m (6.6 ft.)
0.4 m (1.2 ft.)
4 m (13.1 ft.)
0.7 m (2.3 ft.)
6 m (19.7 ft.)
1.1 m (3.5 ft.)
8 m (26.2 ft.)
1.4 m (4.6 ft.)
10 m (32.8 ft.)
1.8 m (5.8 ft.)
The signal beam may penetrate the side wall of non-metallic tanks (e.g. fibreglass tanks).
w
Such materials are largely transparent to the radar signal. Nearby objects outside the tank
may cause disturbing radar echoes.
GB
