BERTHOLD TECHNOLOGIES LB4710-050, User Manual

Page: 27 / 227

Chapter 3 Functional Safety
Mini-Switch LB 471
27
Empty calibration

The level must be at least 50 mm below the limit level. The
radiation channel of the shielding is open.

Push the “Cal” button for 3 seconds
 The empty count rate is read in.
At the end of the measuring time, code 30 is displayed and
the read-in empty count rate.
Full calibration

The level must be at least 50 mm above the limit level.
If this is not possible, you may also close the source shield-
ing. If only the source shielding is closed to carry out the
full calibration, then you have to keep in mind:
-
Make sure that the absorption of the closed shielding
nearly corresponds to the absorption of the product. If in
doubt, please contact B
ERTHOLD
T
ECHNOLOGIES
or your local
representative.
-
Typically, you will lose some dynamics in the measure-
ment, which results in a higher time constant.

Select code 31.
Push the Enter button
Push the Cal button.
 The full count rate is read in.
At the end of the measuring time, code 31 is displayed and
the read-in full count rate.
Calibration

Select code 36.
Push the Cal button.

A checkmark and the digits 0000 confirms that the calibra-
tion was successful.
If an error message is display, the error has to be removed
as described in the User's Manual and in the error list; then
the calibration has to be carried out once more.
Test

Write down the empty and full count rate in code 30 and
code 31.
Select code 60.
Enter the full count rate in code 60.

The measurement must show 0% in code 10.
If not, check the calibration.

Select code 60.
Enter the full count rate in code 60.
The measurement must show 100% in code 10.
If not, check the calibration.