Density Meter LB 444 SECTION 3. INSTALLATION
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f) The pipeline should not be expanded. If this must be done, do it only on
vertical pipelines.
Pipelines may only be expanded at the measuring point, if
•
a continuous flow of the product over the entire pipeline cross-section
will be ensured. Particularly with high viscosity products this will not al-
ways be the case. Usually the product flows only in the center. As the
measurement covers the entire cross-section it follows that the result will
not be representative.
•
no gas bubbles will form in the path of radiation.
g) Suspension measurements must not be carried out directly at a pipe-bend,
for there the material will not be distributed homogeneously.
The distance from the bend must be the larger:
•
the higher the flow rate
•
the bigger the difference between liquid density and solids density.
h) If the measuring system is installed outdoors, it must be protected from rain
and direct sunshine (e.g. by a thin sheet metal). Please keep in mind that
the cables must not be exposed to temperatures exceeding 70°C. Moreo-
ver, water entry via cable bushings must be prevented.
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