NUS-7
NUS-7 K03/0617
Seite 11
The maximum distance to be measured is the greatest distance between the
surface of the transducer and the farthest level to be measured.
The factory programmed, greatest distances (DEFAULT values) which
can be
measured
by the units are listed in the table below. For the actual application the
maximum distance
to be measured
i.e. the distance between the sensor and the
bottom of the tank should be entered in P04.
NUS-7
Level
transmitter
for liquids
Maximum measuring distance X
M
m/feet
Transducer material PP / PVDF
NUS-7 6/20
Since the
level
is determined by calculating the difference between the
value set
in
P04
and
distance (DIST) is measured
by the
unit, it is essential that the correct
value of (H) is set in
P04
. To obtain the best accuracy it is suggested that this
distance is measured in the empty tank.
P05: Minimum measuring distance (Dead zone - Close-end blocking)
FACTORY DEFAULT: X
m
as per chart
The range, beginning with the sensor’s surface, within which (due to the
physical restraint of the ultrasound measurement system) measurement can
not be made, is called the dead zone. The NUS-7 will not accept any echo
within the blocking distance set here.
Close-end blocking may be represented as the extension of the dead zone
within which a possible echo will not be taken into consideration making
possible to exclude disturbing objects near to the sensor.
Automatic Close-end blocking =Dead Band control
(P05 = X
m
)
Device with factory default will automatically
set the smallest possible dead
band
depending on the conditions of the operation.
This will be under optimal conditions a bit smaller in unfavourable
circumstances greater than value given in the chart.
Manual Close-end-blocking with limitation
≥
dead zone
(P05>X
m
)
By entering a value, higher than the factory default the close-end blocking will
be either the value programmed in P05 or the actual dead zone distance
(influenced by the actual conditions of the application) whichever is greater.
