BERTHOLD TECHNOLOGIES LB 480, User Manual

Page: 341 / 450

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
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Volume 3 Menu Structure
3
2.22
Cal Settings
Menu path: Device Config

Setup

Cal Parameter

Cal
Settings .
The basic settings for the calibration are defined in this menu.
IMPORTANT
Changes in this parameter group have an effect only when you call
Calibrate ( Device Config

Setup

Cal Parameter , page 3-
336 ).
1 Nuclide

Enter here the isotope (nuclide) that is used in your source:
• Co-60
• Cs-137
• USER DEFINED
This entry controls the automatic decay compensation. The correct
entry is also important in a single-point calibration and for gas den-
sity compensation. The isotope used is listed on the type plate of
the shielding and on your delivery documents. The item
USER
DEFINED allows you to use any isotope you want. In this case,
additional parameters are requested: Specify the half-life under
Half Life Time and the absorption coefficient at Absorption .
What happens when you have selected the wrong isotope?
As a result of the wrong decay compensation, you will get a deviat-
ing display only after several weeks or months, with the deviation
increasing over time. If you perform a calibration with the gas den-
sity compensation GDA, or a 1-point calibration, the wrong isotope
will also calculate wrong calibration data.