Vega MINITRAC 31 Operating Instructions Manual page 52

6 Set up with the display and adjustment module
Adjustment "covered"
(two-point adjustment)
Adjustment "uncovered"
(two-point adjustment)
52
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 ad-
justment" 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 MINITRAC 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 MINITRAC 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 MINITRAC 31.
This menu item appears only if you have selected " Two point ad-
justment" 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 MINITRAC 31 is uncovered.
You thus get the max. pulse rate (ct/s) for the "uncovered" adjustment.
Enter the requested pulse rate manually or let the rate be determined
by MINITRAC 31. Automatic determination of the pulse rate should be
given preference.
MINITRAC 31 • Foundation Fieldbus