Berthold Duo Xpert LB 478 MPLM, Руководство по эксплуатации

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3 System Description LB 478 MPLM
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56925-8BA2 Rev.00, 07/2019
3.2 Measuring Principle
The Multiphase Level Measurement system EmulsionSENS consists of radiometric
density devices LB 480 at different elevations through the measurement span (see
Figure 1) and evaluation units LB 478 MPLM. Such an arrangement allows accurate
measurement of the density at each of these positions and provides a density pro-
file of the fluids as they separate inside the vessel.
The density measurement is based on the through-beam method and uses the
physical laws of absorption of radiation by matter. The resulting measurement ef-
fect is the ratio I/I0 between the unattenuated radiation I0 and the radiation I
weakened by the measured medium.
The density values of the individual detectors LB 480 are sent to the evaluation unit
LB 478 via RS485. By means of an algorithm implemented in the evaluation unit LB
478, interface levels can be calculated from the measured density values. This al-
lows the operator to see where the top of a layer is located as well as the bottom
of a layer.
Tip
Further information on the functional principle of the detectors can be found
in the operating manual of the detector.
3.3 System Components
1
2
3 Master-EVU / extension module with wide range supply (100-240 V AC, 50/60 Hz)
Alternatively with 24 V supply (18-32 V DC)
19" subrack
Clamp block for electrical connections
Fig. 2 System components