04/03 347 LB 444
30
Figure 14: External installation of shielding and detector
To comply with the Radiation Protection Regulation, areas with dose rates
> 3000 µSv/h (300 mrem/h) – so-called restricted areas – must be secured to
rule out that personnel is exposed to radiation (see local regulations!)
The pipeline must not be subject to heavy vibrations
as this could damage the detector.
If this cannot be avoided, the shielding container and the detector must be installed ex-
ternally (see Figure 14).
Since the calibration of the measurement requires that samples of the product be taken,
a sampling point
has to be provided near the installation.
The product temperature
for temperature compensation must be measured directly next
to the density measurement.
5.2.2 Installation in a Container
If density measurements are carried out in a
container, the source is installed in a special
lead shielding in a protection tube inside the
container. Special care must be taken that the
measuring path is not changed by bending the
protection pipe, as this would lead to signifi-
cant measurement errors. An additional brace
may be required for very long protection tu-
bes. The material of the protection pipe must
be sufficiently resistant to the product being
measured.
Installation has to be done such that the ra-
diation path lies diagonally to the flow direc-
tion. With horizontal flow the radiation exit
channel should point toward the bottom to
prevent deposit formation in the path of radia-
tion.
Brace
Figure 15: Installation in a container
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