15
Installation and operating instructions BM 702 (07/00)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Sump
non
measurable
zone
tank height
(Fct. 3.1.1)
Fct. 3.1.4
upper reference point
(top edge of tank connecting flange)
block distance (Fct. 3.1.2)
response
current output
20
m A
max
(Fct. 3.3.4)
4
min
(Fct. 3.3.3)
lower reference point
(tank bottom / datum point)
Fct. 3.1.5
threshold
measuring
m A
[e.g.: 5.30 m]
[e.g.: 0]
[e.g.: 0]
[e.g.: 0.6 m]
[e.g.: 0.4 m]
[e.g.: 4.0 m]
range
Empty-tank spectrum
To enable the BM 702 to identify and blank out interference signals, e.g. caused by fixed
and moving tank internals, the tank profile (empty-tank spectrum) needs to be recorded
once only prior to (initial) start-up. For recording, the tank should be completely empty and
all moving parts (e.g. agitators) switched on. If major interference through internals is not
expected, recording of the empty-tank spectrum can also be dispensed with, since the
factory has already carried out and stored a partial empty spectrum of the flange system.
Empty-tank spectrum recording via display
After selecting menu item
Fct. 3.5.2,
press key
→
. The display then shows whether the
empty spectrum is currently ON or OFF. Then press the
↵
key if no change is to be made, or
use the
↑
key to choose between the following options:
•
ON: the empty-tank spectrum is (again) switched on and taken into account for
measurements.
•
OFF: the empty-tank spectrum is not taken into account for measurements, but
remains stored in the BM 702 and can be switched on again at a later date.
•
RECORD: the existing empty-tank spectrum is to be deleted and a new one
recorded.
