Dinel ULM -70 Series, Instruction Manual

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Fig. 2: Level meter dead zone
m – Dead zone
I
NSTALLATION INSTRUCTIONS
Install the level meter in the • vertical position into the upper lid of the tank or reservoir using
a welding fl ange, a fastening nut or a fl ange so that the level meter axis can be perpendicular to
the surface level of the measured liquid (Fig. 1).
The min. • dimensional parameters to install the
level meter into a lid or a ceiling of a tank are given
in Fig. 3.
When installing in an • open channel (reservoir, drain
etc.), install the level meter onto a bracket as close as
possible to the expected max. level.
In connection with the measurement principle, no •
signals re fl ected in the area immediately under the
level meter can be evaluated (dead zone). The dead
zone (Fig. 2) determines the min. distance possible
between the level meter and the highest surface lev-
el. The min. distances to the medium are given in the
chapter "Technical speci
fi cations" (p. 24).
It is necessary to install the level meter so that the •
bin level cannot interfere with the dead zone when
fi lled up to the maximum. If the measured level in-
terferes with the dead zone, the level meter will not
work properly.
Fig. 1: Recommended installation
in the tank
Fig. 4: Possible installation of the installation neck
a – Neck height
b – Neck width
m – Dead zone
ULM–70–02 ; 06
a < 3 b
b > 100 mm
ULM–70–10
a < 1,5 b
b > 100 mm
ULM–70–20
a < 1,5 b
b > 150 mm
Fig. 3: Installation distance from the tank wall
ULM–70–02 ; 10
d > 1/12 c
(min. 200 mm)
ULM–70–06
d > 1/8 c
(min. 200 mm)
ULM–70–20
d > 1/10 c
(min. 200 mm)
d – Distance from
the tank wall
c – Measurement
range of the level
meter
If the maximum surface level in the tank interferes with the dead zone, the level meter has •
to be mounted into a higher installation neck . In this way, the tank can be fi lled nearly up to
the maximum volume. The inner neck surface has to be even and smooth (without edges and
welded joints); the inner edge should be rounded where the ultrasonic wave leaves the pipe.
The neck diameter should be as large as possible but the neck height should be as low as
possible. Recommended dimensions of the input neck are given in Fig. 4.
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