Vega POINTRAC 31 Operating Instructions Manual page 25

Setup/Adjustment mode
Setup/Adjustment
uncovered (single point
adjustment)
POINTRAC 31 • 8/16 mA/HART - four-wire
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
the adjustment of the sensor with full status (covered) and with empty
status (uncovered).
Hence, you will get a very reliable switching point.
With single point adjustment, you have to define the difference
between the min. and max. adjustment points (Delta I) yourself during
the following setup.
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 in uncovered status.
Empty the vessel until the sensor is uncovered.
For this 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.
The pulse rate is entered in ct/s. This is the number of counts per
second, i.e. the measured gamma radiation reaching the sensor.
Prerequisites:
•
The radiation is switched on - source container is set to "On"
•
There is no medium between source container and sensor
You can enter the value for "Adjustment uncovered" (ct/s) manually.
You can have the value for "Adjustment uncovered" determined by
POINTRAC 31.
6 Set up with the display and adjustment module
25