ULM–70
© Dinel, s.r.o.
19
In case of installed mixers, it is
necessary
to
position the mixers under the level meter (di-
rect the mixer blade to the ultrasonic signal
beam).
Note: If there are significant obstacles in the
upper half of the tank,
multiple false reflec-
tions
can occur especially in closed tanks. In
such cases it is necessary to reduce the level in
the tank as much se possible to correctly mask
these possible multiple false reflections.
1/2 of Tank
Obstacles
Tolerance zone for
"LEVEL DISTANCE" value
MEDIUM TEMPERATURE
The level meter is equipped with
automatic temperature compensation
. If for instance in
the tank there is a difference of 10°C between the temperature of the measured material
(medium) and the temperature at the mounting site of the level meter (see the mode "DIA
-
GNOSTICS, page 20), the measuring accuracy will be reduced by around 1% of the set range. If
this function is activated, this temperature difference can be compensated.
If in the tank (open
channel) is a big difference between the temperature of the measured medium (liquid) and
temperature in the place of installation of the ULM (see mode, "DIAGNOSTICS" page 20), it is
advised to improve the precision of the measurement by the zone temperature compensation.
Otherwise, this mode is
not necessary to run
.
M E D I U M T E M P E R A T U R E
F A I L U R E M O D E
H A R T
F A C T O R Y D E F A U L T
R E S E T
M E D I U M T E M P E R A T U R E
Y E S
+ 2 0 ° C
Inactive compensation (initial state), the
word "NO" appears on the display.
See the "UNITS" menu for tempera
-
ture unit selection (°C or °F).
After start of the
zone temperature compensation
mode it is necessary to set the tempera
-
ture of the surface of the medium. The level meter then calculates the average value from the
medium temperature and the temperature at the installation place of the level meter. With
such an average temperature it counts in calculating of the velocity of acoustic waves propaga
-
tion and for determination of the level position.
Level Distance
NO ECHO: Current in case of echo loss
DEAD ZONE: Dead zone current
The values can be set in three steps: 3.75 mA,
22 mA and LAST (last measured data).
FAILURE MODE
It
defines the output current
of the level meter when the measured medium level is in the dead
zone ("DEAD ZONE") or outside the measurement range in case of echo loss ("NO ECHO").
F A I L U R E M O D E
N O E C H O : 3 . 7 5 m A
D E A D Z O N E : 2 2 m A
11 .2 . SERVICES SETTINGS
In the supplemented configuration, you can set parameters
of sensitivity, mapping of false reflections, temperature differ
-
ence compensation, behaviour in case of fault conditions or
HART
®
communication. Here, you can set the sensor into the
initial state or reset it as well. The settings are accessible in the
basic menu under the item "SERVICE".
B A S I C S E T T I N G S
S E R V I C E
D I A G N O S T I C
C L O N E S E T T I N G S
P A S S W O R D
I N F O
M E D I U M T E M P E R A T U R E
F A I L U R E M O D E
H A R T
F A C T O R Y D E F A U L T
R E S E T
Fig. 21: Level distance zone
Summary of Contents for Dinel ULM-70
Page 2: ......
