VEGA Capacitive electrodes EL Profibus PA - Manual (Page 44)

44 Capacitive electrodes EL - Profibus PA
Sensor parameter adjustment – Sensor
optimisation
In this window, the mode of the sensor can
be set. With this, you modify the phase angle
of the phase selective admittance processing
(PSA). "Mode 1" is preset.
Mode 1 = Phase angle 90°
Mode 1 is a pure capacitance measurement,
the ohmic resistance is not taken into account
in the measuring result.
Application:
- standard adjustment
- non-conductive liquids up to approx. 50 µS
- compensation of conductance changes in
liquids
- generally with partly insulated electrodes in
liquids
- non-conductive solids without moisture
content
- with insufficient product grounding
- for electrodes in conjunction with a concen-
tric tube
- in non-conductive vessels with exterior
grounding plate outside
Mode 2 = Phase angle 45°
The capacitance and the ohmic conductance
are measured separately, the capacitance
value is corrected by calculating it with the
ohmic conductance, so that measuring errors
caused by conductive buildup or changes of
moisture content can be compensated.
Application:
- highly conductive products
- adhesive, conductive products
- solids with fluctuating moisture content
Setup
In the window "Profibus output" you can de-
termine the options for Profibus output (acc.
to Profibus PA instrument profile). Confirm the
settings with
OK . The values under "Scaling"
change the Profibus output and the value on
any display that may be connected. To use
the values for a display, "scaled" must be
chosen under "Display of measured value".
Click in the window "Outputs" to Profibus
output .
When clicking "Display of measured value",
you can choose twhat should be displayed
on the sensor display, e.g. level, capacitance
or scaled value.