7
© Dinel, s.r.o. ULM–53L
Fig. 2: Level meter dead zone
a) Install the level meter in a vertical position into the upper lid of the tank (vessel) or reservoir
using a lug, a fastening nut or a ange in such a way that the ULM axis is perpendicular to the
level of the measured liquid (Fig. 1).
b) Minimum dimension parameters when installing into
a lid or a ceiling of a tank are listed in Fig. 3.
c) When installing in an open channel (r e s e r v o i r, d r a i n
and the like), install the level meter onto a console to
the expected maximum level as close as possible.
d) In compliance with the measurement principle, no
signals reected in the area directly below the level
meter (the so-called dead zone) can be evaluated.
The dead zone (Fig. 2) determines the minimum
distance possible between the level meter and the
highest surface level. Medium minimum distance
parameters are listed in chapter on „Technical
specications“.
e) It is necessary t o i n s t a l l t h e l e v e l m e t e r i n s u c h a w a y
that the bin level does not interfere with the dead
zone when lled up to the maximum. If measured
level interferes 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 heigh
b – Neck width
m – Dead zone
Fig. 3: Installation distance from the tank wall
d – Distance from tank wall
c – Measuring range
m – Dead zone
f) In case the maximum surface level in the tank interferes with the dead zone, the level meter
has to be mounted into a higher installation neck. Subsequently, the tank can be lled nearly up
to the maximum volume. The neck’s inner surface has to be even and smooth (without edges
and welded joints), the inner edge should be rounded in the position point where the ultrasonic
waves leave the pipe. Choose the largest possible neck’s diameter, but keep the neck’s height
as low as possible. Recommended dimensions of the neck are listed in Fig. 4.
ULM–53L–02 ; 06 a < 3 b
b > 100 mm
ULM–53L–10 a < 1,5 b
b > 100 mm
ULM–53L–20 a < 1,5 b
b > 150 mm
ULM–53L–02 ; 10 d > 1/12 c
(Min. 200 mm)
ULM–53L–06 d > 1/8 c
(Min. 200 mm)
ULM–53L–20 d > 1/10 c
(Min. 200 mm)
7 .
