VEGA FIBERTRAC 31 4 … 20 mA_HART - four-wire - Manual (Page 35)

35
6 Set up with the display and adjustment module
FIBERTRAC 31 • 4 … 20 mA/HART - four-wire
40446-EN-131119
With the setting "Automatic", the instrument itself calculates a suitable
damping on the basis of the adjustment and the measured value
changes. This setting is particularly suitable for application where fast
and slow level changes occur.
If you know the level at a certain height, you can enter in this menu
item the determined real level to correct the measured value. The
function shifts the linearization curve to this determined point.
With this procedure the measurement can be adapted exactly to the
conditions in the vessel.
In this menu item you can define the characteristics of the sensor and
its behaviour in case of a fault.
In this menu item you can define the behaviour of the current output.
You can determine the current with min. and max. level separately.
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.
An X-ray alarm is triggered if the impulses (ct/s) are more than 25 %
above the max. value from the linearization table.
This fault message is only outputted for the period of the increased
X-ray radiation. Then the fault message is automatically reset.
In this menu item you can determine the behaviour of the sensor
when external radiation sources appear.
Setup/Real value correc-
tion
Setup/Current output
mode
Setup - Current output
Min./Max.
Setup/External radiation
alarm