Contactless Measurement
of Level
LB 440
C O N T R O L
P R O C E S S
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
with Shielding
2Point
Detector
Max
Min
3
0/4 ... 20 mA
Alarm
4 Evaluation Unit LB 440
Figure 1
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
with Shielding
2Rod
Detector
Max
Min
3
0/4 ... 20 mA
Alarm
4 Evaluation Unit LB 440
Figure 2
Measuring Arrangement
Figures 1 and 2 show schematic layouts of typical mea-
suring 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 |
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
2
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 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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