Vega POINTRAC 31 Operating Instructions Manual page 26

6 Set up with the display and adjustment module
Setup/Delta I (single
point adjustment)
Adjustment covered
(double point adjust-
ment)
26
This menu item appears only if you have selected "Single point
adjustment" as adjustment mode (Setup/Adjustment mode).
In this menu item you can adjust at which percentage value of the
max. pulse rate the sensor should switch over.
Since in most cases the radiation is almost completely absorbed
when the sensor is covered, the pulse rate when the sensor is cov-
ered is very low.
The change between the two statuses is sufficiently clear.
Hence a percentage value of 90 % for the Delta I value is recom-
mended.
You select lower values for the sensitive detection of material cones
or buildup which only cause a partial absorption of the radiation.
This menu item appears only if you have selected under adjustment
mode (setup/adjustment mode) the "Double point adjustment".
In this menu item you can set the min. pulse rate (ct/s) at which the
sensor should switch over.
Fill the vessel until the POINTRAC 31 is covered.
You thus get the min. pulse rate (ct/s) for the adjustment covered.
Enter the requested pulse rate manually or let the rate be determined
by POINTRAC 31. Automatic determination of the pulse rate should
be given preference.
You can enter the adjustment point (ct/s) manually.
You can let the adjustment point be determined by POINTRAC 31.
POINTRAC 31 • 8/16 mA/HART - four-wire