Vega POINTRAC 31 Operating Instructions Manual page 26

6 Set up with the indicating and adjustment module
Setup/Background ra-
diation
Setup/Unit
Setup/Adjustment mode
26
Real value correction
You can also use the POINTRAC 31 as a Slave instrument for
detection of a defined level. Hence you can automatically correct the
measured value of a continuously measuring, radiation-based sensor
to the real value when this level is reached.
For this function you require PACTware with the respective DTM.
The natural radiation on earth influences the accuracy of the
measurement.
By means of this menu item, the natural background radiation can be
faded out.
For this purpose, the POINTRAC 31 measures the natural background
radiation and sets the pulse rate to zero.
In future the pulse rate from this background radiation is automatically
deducted from the total pulse rate. This means: on the part of the pulse
rate from the source used is displayed.
The source container must be closed for this setting.
In this menu item you can select the temperature unit.
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
automatically.
We recommend selecting the double point adjustment. For this
purpose, it should be possible to change the level of the vessel to carry
out the adjustment of the sensor in full status (covered) and in empty
status (uncovered).
Hence, you will get a very reliable switching point.
With the single point adjustment, you have to select the differential
value min. and max. adjustment points (Delta I) during the following
setup.
POINTRAC 31 • 8/16 mA/HART - four-wire