9
©
Dinel, s.r.o. ULM–53L
Fig. 9:
Reflection board
H + L = Dead zone
Fig. 11: Intensely stirred
surface
!
Fig. 8: Direct solar radiation shielding
cover
k) The level meter must
not be installed
in places
with direct solar radiation and must be protected
against weather conditions.
l) In case the installation at places with direct solar
radiation is inevitable, it is necessary to mount
a
shielding cover
above the level meter (Fig. 8).
m) To lower the minimum distance to the medium meas
-
ured, a
reflection board
made from solid, even and
smooth material can be installed together with the
level meter (Fig. 10). Subsequently, the tank can be
filled nearly up to the maximum volume. The solution
is suitable for open tanks and reservoirs.
n) 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 operation,
inflow of liquid and the like. Consequently, measuring
range or unreliable level meter’s functioning
might
follow
(Fig. 11).
o) False surface reflections 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).
p) The level meter should not be installed at places
where ultrasonic signal
false reflections
caused
by stirrer blades might occur (Fig. 13).
!
Fig. 10: Moderately stirred
surface
Fig. 12:
False reflection caused by
mixer blade
