6
©
Dinel, s.r.o. ULM–70
Fig. 2: Level meter dead zone
m – Dead zone
(blind zone, blocking
distance)
6 . INSTALLATION INSTRUCTIONS
• Install the level meter in the
vertical position
into the upper lid of the tank or reservoir using
a welding flange, a fastening nut or a flange 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.
• The reference plane for the measurement is the
lower edge of the transducer (Fig.2).
In connec-
tion with the measurement principle, no signals
reflected
in the area immediately under the level
meter can be evaluated.
The zone
(Fig. 2) deter
-
mines the min. distance possible between the
level meter and the highest surface level. The min.
distances to the medium are given in the chapter
"Specifications".
•
It is necessary to install the level meter so that the
bin level cannot
interfere
with the dead zone when
filled 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. 3: Installation distance from the tank wall
•
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 filled nearly up
to the maximum volume. The inner neck surface has to be even and smooth (without edg
-
es 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.
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)
Fig. 4: Possible installation of the installation neck
a – Neck height
b – Neck width
m –
Dead zone (blind zone,
blocking dist.)
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
d – Distance from
the tank wall
c – Maximum reach
of the level meter
reference plane for
the measurement
Summary of Contents for Dinel ULM-70
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