Vega Capacitive electrodes EK Profibus PA Bedienungsanleitung PDF herunterladen (Seite 50)

50 Capacitive electrodes EK - Profibus PA

Diagnostics

5.4 Failure rectification

Failure Measure, failure rectification

Sensor defective, Test the internal connections:

measurement does • Loosen the 4 screws of the housing cover with a Phillips screwdriver

not react to level and remove the housing cover.

changes • Loosen the two small screws with a Phillips screwdriver and pull the

oscillator out of the housing.

• Measure with an ohmmeter (range MOhm) the resistance values

between the following contacts:

- Capacitor

1 MΩ

shielding

Contact 4 and middle pin (1)

The resistance must be 1 MOhm.

If the resistance is less, it indicates moisture in the housing or a defect

in the electrode insulation. A possible reason could be a non-insulated

electrode used in a conductive (moist) medium.

If the resistance is higher or if the connection is interrupted, the reason

is usually a bonding failure in the adapter plate or a resistor defective

due to strong, electrostatic discharge.

In both cases, return the sensor to VEGA for repair.

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Vega Capacitive electrodes EK Profibus PA Bedienungsanleitung Seite 50