BERTHOLD LB 440 User Manual
Contactless Measurement
of Level
LB 440
PROCESS CONTROL
Level Gauge LB 440
The measuring system LB 440 is used
for the contactless, continuous
measurement of liquids and bulk
materials in reactors, vessels and
bunkers. The measurement is not
1 Rod Source
2 Point
Detector
Max
Min
with Shielding
affected by the chemical and physical
properties of the product being
measured. The level measurement is
adapted to the specific geometry of
the vessel.
1 Point Source
2 Rod
Detector
Max
Min
with Shielding
3
0/4 ... 20 mA
Alarm
4 Evaluation Unit LB 440
Figure 1 Figure 2
Measuring Arrangement
Figures 1 and 2 show schematic layouts of typical measuring arrangements. It is comprised of the source 1
mounted on the outside of the container, a detector
2 and the connection cable 3 from the detector
to the evaluation unit LB 440 4 . Source and detector
3
0/4 ... 20 mA
Alarm
4 Evaluation Unit LB 440
applications a rod source and rod detector (Fig. 5) can
be used. Which of these options is selected is dependent
upon the measuring geometry, the measuring task,
ambient factors or even considerations of space and
money. For larger measurement ranges several rod
form a radiation field corresponding to the size of the
measuring range. This can be achieved by using a rodshaped source and a point detector (Fig. 3) or a pointshaped source and a rod detector (Fig. 4), for special
detectors can be used together in a line. Signals from
individual detectors are transmitted via slave units to a
master evaluation unit for indication of product level.
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