53
6 Set up with the display and adjustment module
FIBERTRAC 31 • Profibus PA
43833-EN-170126
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 sensitive detection of material cones or
buildup which cause only partial absorption of the radiation.
This menu item appears only if you have selected "
Two point adjust-
ment
" as adjustment mode (Setup - Adjustment mode).
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 FIBERTRAC 31 is covered.
You thus get the min. pulse rate (ct/s) for the "covered" adjustment.
Enter the requested pulse rate manually or let the rate be determined
by FIBERTRAC 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 FIBERTRAC 31.
This menu item appears only if you have selected "
Two point adjust-
ment
" as adjustment mode (Setup - Adjustment mode).
In this menu item you can set the max. pulse rate (ct/s) at which the
sensor should switch over.
Empty the vessel until the FIBERTRAC 31 is uncovered.
You thus get the max. pulse rate (ct/s) for the "uncovered" adjustment.
Setup - Delta I (single
point adjustment)
Setup - Adjustment cov-
ered (two point adjust-
ment)
Setup - Adjustment
uncovered (two point
adjustment)