VEGA WEIGHTRAC 31 4 … 20 mA_HART - four-wire - Manual (Page 44)

44
7 Setup with PACTware
WEIGHTRAC 31 • 4 … 20 mA/HART - four-wire
42374-EN-131119
Process speed
The speed of the conveyor belt is important for the measuring result
of the sensor.
This function is selected as a standard feature. Hence the input can
be used for an external tachometer or a speed value from the control
room.
In this window you can accept the modifications previously made.
The data are written into the instrument.
Fig. 28: Fade out background radiation
The natural radiation on earth influences the accuracy of the meas-
urement.
With this menu item the natural background radiation can be faded
out.
For this purpose, the WEIGHTRAC 31 measures the natural back-
ground radiation and sets the pulse rate to zero.
In the future, the pulse rate from this background radiation will be
automatically deducted from the total pulse rate. This means: only
the component of the pulse rate originating from the source will be
displayed.
Caution:
For this setting, the source container must be closed and the sensor
already in operation for five minutes.
Note:
If you want to use an already existing source container, we recom-
mend measuring the background radiation without connected source
container. A source container with a Cs-137 source should have a
Accept application (step
4)
Setup/Background radia-
tion (step 5)