BERTHOLD TECHNOLOGIES LB 480, User Manual

Page: 209 / 450

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
2 – 209
Volume 2 2 Installation
2
Operating a flange shielding with steel cable
A steel cable for positioning of the rod source is supplied for each
source.
When opening the shielding, the source may fall into the dip tube.
If the source drops into the dip tube during applications where the
flange shielding has been installed onto the vessel from above, it
can be recovered again only with a lot of work and under the super-
vision of the Radiation Safety Officer.
Therefore, never open the source locking mechanism and the set-
screw before you have latched all sources at the head end into the
steel cable or the shaft core.
Fig. 2-32 shows how to move a source to the measurement posi-
tion.

Couple cable to source.
First, take off the cover. Below the cover you see the source end
piece(s) to which the steel cable has to be latched.
The three illustrations on the following page show how to latch
the cable into the clutch at the source. The clutch includes a
snap-action mechanism that prevents that the connection will
become undone on its own.

Define source position in vessel.
To define the position of the source in the vessel, determine the
required cable length and adjust it using the positioning screw
on the cable.

Insert source in dip tube:
–
Make sure that the latch clicks into place correctly and can
be set vertical to the source.
– Open the locking mechanism.
– Pull the source back using the cable and open the respec-
tive clamping screw.
– Slowly lower the rod source on the cable into the dip tube.
When closing the shielding, the steel rope may be cut and the
source may fall into the dip tube.
If the source drops into the dip tube during applications where the
flange shielding has been installed onto the vessel from above, it
can be recovered again only with a lot of work and under the super-
vision of the Radiation Safety Officer.
Therefore, never close the source locking mechanism as long as not
all rod sources are again in the shielding. Otherwise, the steel cable
may be kinked or even cut.