Vega Capacitive electrodes EL Profibus PA Bedienungsanleitung PDF herunterladen (Seite 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.

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