VEGA VEGAFLEX 66 (-110…+400°C) Foundation Fieldbus - Manual (Page 28)

6.4 Setup procedure
After VEGAFLEX 66 is connected to voltage supply or after
voltage recurrence, the instrument carries out a self-check for
approx. 30 seconds. The following steps are carried out:
l
Internal check of the electronics
l
Indication of the instrument type, the firmware as well as
the sensor TAGs (sensor designation)
l
Status byte goes briefly to fault value
Then the current measured value will be displayed and the
corresponding digital output signal will be outputted to the
cable.
1)
As VEGAFLEX 66 is a distance measuring instrument, the
distance from the sensor to the product surface is measured.
To have the real product level displayed, an allocation of the
measured distance to the percentage height must be made. To
carry out this adjustment, the distance is entered with full and
empty vessel. If these values are not known, an adjustment
with the distance values, e.g. 10 % and 90 % is also possible.
Starting point for these distance specifications is always the
seal surface of the thread or flange. With these settings, the
real level is calculated. Furthermore the operating range of the
sensor is limited from maximum to the required range.
The real product level during this adjustment is not important,
because the min./max. adjustment is always carried out
without changing the product level. These settings can be
made ahead of time without the instrument having to be
installed.
In the main menu item "Basic adjustment", the individual
submenu items should be selected one after the other and
provided with the correct parameter values.
Caution:
If there is a separation of different liquids in the vessel, e.g. by
condensation, VEGAFLEX 66 will always detect the medium
with the higher dielectric figure (ε
r
).
Keep in mind that interfaces can cause faulty measurements.
If you want to measure the total height of both liquids reliably,
please contact our service department or use an instrument
specially designed for interface measurement.
1) The values correspond to the actual measured level as well as to the set-
tings already carried out, e.g. default setting.
Switch on phase
Parameter adjustment
28 VEGAFLEX 66 • Foundation Fieldbus
6 Set up with the indicating and adjustment module PLICSCOM
32765
-EN
-080716