VEGA WEIGHTRAC 31 Foundation Fieldbus - Manual (Page 42)

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7 Setup with PACTware
WEIGHTRAC 31 • Foundation Fieldbus
42375-EN-131120
Fig. 25: Select inputs
Summation
If you want to use several instruments, for example on a broad con-
veyor belt, activate the function "Summation".
The instrument then operates as master of a cascading group.
X-ray alarm
Radiation from external sources can influence the measuring result of
the sensor.
Possible external radiation sources can be, for example, a weld joint
test on a neighbouring facility or other radiation-based instruments.
For this you need an additional sensor (X-ray alarm sensor) for detec-
tion of the external radiation.
The X-ray alarm is only outputted for the period of increased external
radiation. Then the X-ray alarm is automatically reset.
In this menu item you can determine the behaviour of the sensor
when external radiation sources appear. You can also select the
switching threshold as needed in case of external radiation.
You can choose whether the sensor should output modulated current
(dithering) or the set fault current in case external radiation appears.
In the case of modulated measuring current (dithering), the last
valid current value is maintained and the current output modulates a
square-wave voltage ±1 mA around this value.
Information:
If you have activated the X-ray alarm, you have to enter in the next
step the type and the data of the connected X-ray alarm sensor.