04/03 347 LB 444
29
The distance from the bend must be the larger
• the higher the flow rate
• the bigger the difference between liquid density and Solid density.
Measuring system installed outdoors have to 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. Moreover, cable bushing and cable have to be aligned
such that no water can flow along the cable into the bushing.
RADIOACT IVE
Figure 12: Outdoor installation
On S or U-shaped measuring paths
the shielding
container with source has to be installed on top
and the detector at the bottom.
A temperature insulation consisting of glass or
rock wool is not suitable, as it does not ensure
safe installation of the measuring system. If, for
technical reasons, temperature insulation at the
measuring point is absolutely required, it must be
made of a hard, non-hygroscopic material, i.e.
aluminum silicate or it must not be installed di-
rectly on the pipeline, but on separate supports
(see Figure 14).
RADIOACTIVE
Figure 13: Installation on S or
U-shaped measuring path
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