46 Capacitive electrodes EL 4 … 20 mA - compact
Diagnosis
Failure Measures, failure removal
Sensor defect, Test of the internal connections:
measurement does • Loosen the 4 screws of the housing cover with a screwdriver and
not react to level remove the housing cover.
changes • Loosen the two small screws with a screwdriver and pull the oscillator
out of the housing.
• Measure with an Ohm-Meter (range MΩ) the resistance values
between the following contacts:
C
M
- Meas. capacitor
4
6
C
M
1 M
Screen
Contact 4 against middle pin (1)
The resistor must be 1␣ MΩ .
If the resistor is less, this means humidity in the housig or a failure in the
electrode isolation. A possible reason could be a not isolated electrode
which is used in conductive (humid) product.
If the resistor is higher or if the connection is interrupted, the reason is
mainly a bonding failure in the adapter plate or a defect resistor due to
strong electrostatic discharge.
In both cases the electrode must be repaired at VEGA.
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