04/03
347
LB
444
28
5.2
Installation
5.2.1
Installation on Pipelines
Make sure the radiation exit channel of the shielding container is always closed
during installation.
The detector has to be protected against temperatures
>
50°C by a water cool-
ing jacket.
Cables have to be protected against temperatures
>
70°.
When selecting the installation site, please keep in mind:
1.
Selection of measuring site: at the measuring point, the pipeline must always be
completely filled with the product being measured. If the pipeline is only partially
filled, this may result in incorrect measurements.
2.
Neither corrosion nor abrasion or wall deposits must occur at the pipeline walls, as
this will result in incorrect measurements. This hazard is least likely with installations
on vertical pipes.
Gas bubbles in the product falsify the results. This risk can be avoided or at least reduced
by installing the measuring system at a location on the pipeline where the pressure is
fairly high (installation in pressure pipes, at the foot of a standpipe).
If no air bubbles are to be expected in the product, the suction side of the pump should
preferably be used for installation to exclude air bubbles which might occur as a result of
damaged pump seals.
Measurements on horizontal pipelines should be performed using horizontal irradiation to
reduce errors caused by deposit formation and gas bubbles.
Figure 11: Installation on a horizontal pipeline
The pipeline should not be expanded. If it has to be done, it should be done only on ver-
tical pipelines.
Pipelines may only be expanded at the measuring point if a continuous flow of the prod-
uct over the entire pipeline cross-section will be ensured. Particularly with highly viscous
products this will not always be the case. Usually, the product flows only in the center.
Since the measurement covers the entire cross-section, it follows that the result will not
be representative.
No gas bubbles must be present in the path of radiation.
Suspension measurements must not be carried out directly at a pipe-bend, for there the
material will not be distributed homogeneously.
Summary of Contents for LB 444
Page 1: ...Density Meter LB 444 Id No 32816BA2 Rev No 04 22 04 03 ...
Page 2: ......
Page 9: ...04 03 347 LB 444 VII ...
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Page 109: ...04 03 347 LB 444 99 13 4 Mounting Device 90 for Pipe Diameter 21 3 76 1 mm ...
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Page 117: ...04 03 347 LB 444 1 14 Ex Certificates for Evaluation Unit ...
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Page 120: ...04 03 347 LB 444 4 15 Ex Certificate for the Detectors ...
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