VEGA MINITRAC 31 Foundation Fieldbus - Manual (Page 36)

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6 Set up with the display and adjustment module
MINITRAC 31 • Foundation Fieldbus
41782-EN-131119
Setup
In this menu item you can adjust the MINITRAC 31 to the integrated
isotope in the source container.
For this purpose, check which isotope is integrated in the source
container. You can find this information on the type label of the source
container.
Through this selection, the sensitivity of the sensor is adapted
perfectly to the isotope. The normal reduction of the emitter activity is
hence considered through the radioactive decay.
The MINITRAC 31 requires this information of the automatic decay
compensation. This ensures an interference-free measurement over
the complete life time of the gamma emitter - an annual recalibration
is not necessary.
Enter the requested parameters via the appropriate keys, save your
settings with [OK] and jump to the next menu item with the [ESC] and
the [->] key.
Enter here, the respective application.
This menu item enables adaptation of the sensor to the requested ap-
plication. You can choose between the following applications: "Level",
"Density", "Limit level", "X-ray alarm" or "Real value correction".
The natural radiation on earth influences the accuracy of the meas-
urement.
With this menu item the natural background radiation can be faded
out.
Note:
Make sure that some products have a self-radiation. This is for ex-
ample the case with oil or potash salt lye. Therefore the tube must be
filled to determine the background radiation.
For this purpose, the MINITRAC 31 measures the natural background
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.
The source container must be closed for this setting (OFF).
Setup - Isotope
Setup - Application
Setup - Background
radiation