Vega MINITRAC 31 Operating Instructions Manual page 50

6 Set up with the display and adjustment module
Application
Background radiation
Unit
Adjustment mode
50
Through this selection, the sensitivity of the sensor is adapted per-
fectly to the isotope. The normal reduction of source activity through
radioactive decay is thus taken into account.
The MINITRAC 31 requires this information for the automatic decay
compensation. This ensures error-free measurement over the entire
lifetime of the gamma emitter - an annual recalibration is not neces-
sary.
Enter the requested parameters via the appropriate keys, save your
settings with [OK] and jump to the next menu item with the [ESC] and
the [->] key.
Enter here, the respective application.
This menu item enables adaptation of the sensor to the requested ap-
plication. You can choose between the following applications: " Level",
" Point level" or " Summation Secondary".
The natural radiation on earth influences the accuracy of the meas-
urement.
With this menu item the natural background radiation can be faded
out.
For this purpose, the MINITRAC 31 measures the natural background
radiation and sets the pulse rate to zero.
In the future, the pulse rate from this background radiation will be
automatically deducted from the total pulse rate. This means: only
the component of the pulse rate originating from the source will be
displayed.
The source container must be closed for this setting.
In this menu item you can select the temperature unit.
in this menu item you can select if you want to carry out a single or
double point adjustment on the sensor.
With the double point adjustment, the Delta I value is selected auto-
matically.
We recommend selecting the double point adjustment. To use this,
you must be able to change the level of the vessel so as to carry out
MINITRAC 31 • Foundation Fieldbus