Vega WEIGHTRAC 31 Operating Instructions Manual page 44

Radiation-based sensor for mass flow detection

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7 Setup with PACTware

Accept application (step

Setup/Background radia-

tion (step 5)

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

WEIGHTRAC 31 • 4 ... 20 mA/HART - four-wire

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