Chapter 3 Functional Safety
Mini-Switch LB 471
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 BERTHOLD TECHNOLOGIES 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.
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