Dinel ULM-53 series Instruction Manual - Page 8

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Dinel ULM-53 series Instruction Manual
•
The level meter must not be installed in places with
direct solar radiation and must be protected against
weather conditions.
•
In case the installation at places with direct solar ra-
diation is inevitable, it is necessary to mount a shield-
ing cover above the level meter (Fig. 8).
•
If possible, insert the cable from above and let a drain-
ing loop in order to avoid intrusion of humidity (Fig. 9).
•
The cable bushing as well as the connector have to
be tightened suffi ciently to prevent penetration of
moisture.
•
To lower the minimum distance to the medium meas-
ured , a refl ection board made from solid, even and
smooth material can be installed together with the
level gauge (Fig. 10). Subsequently, the tank can be
fi lled nearly up to the maximum volume. The solution
is suitable for open tanks and reservoirs.
•
Scattering or attenuation of the ultrasonic signal
can result if the surface level has been moderately
stirred or rippled as a consequence a stirrer's op-
eration, infl ow of liquid and the like. Consequently,
measuring range or unreliable level meter's function-
ing might follow (Fig. 11).
•
False surface refl ections of the ultrasonic signal might
result as a consequence of rotating mixer's blades
that ripple the surface level and thus cause unreliable
level meter's functioning (Fig. 12).
•
The level meter should not be installed at places
where ultrasonic signal false refl ections caused by
stirrer blades might occur (Fig. 13).
Fig. 11: Moderately stirred
surface
7
!
Fig. 12: Intensely stirred
surface
Fig. 8: Direct solar radiation shielding
cover
Fig. 9: Prevention to avoid
intrusion of humidity
H + L = dead zone
Fig. 10: Refl ection board
!
Fig. 13: False refl ection caused by
mixer blade
ULM–53
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