Vega POINTRAC 31 Operating Instructions Manual page 27

Setup/Adjustment point
(single point adjust-
ment)
Setup/Delta I (single
point adjustment)
POINTRAC 31 • 8/16 mA/HART - four-wire
6 Set up with the indicating and adjustment module
This menu item appears only if you have selected "Single point
adjustment" as adjustment mode (Setup/Adjustment mode).
In this menu item you determine the point at which the POINTRAC 31
should switch.
Empty the vessel until the sensor is uncovered.
For this purpose, enter the requested pulse rate manually or let the
rate determine by POINTRAC 31. The determination of the pulse rate
should be preferred in this case.
The pulse rate is entered in ct/s. This is the number of counts/second,
i.e. the measured gamma radiation reaching the sensor.
Prerequisites:
Radiation is switched on - source container is set to "On"
l
There is no medium between source container and sensor
l
You can manually enter the adjustment point (ct/s).
You can let the adjustment point of POINTRAC 31 determine.
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 the radiation with covered sensor is virtually absorbed in most
cases, the count rate with covered sensor is very low.
The change between the two statuses is sufficiently clear.
27