VEGA VEGACAP 27 - Relay (DPDT) - Manual (Page 20)

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7 Maintenance and fault rectification
VEGACAP 27 • - Relay (DPDT)
33758-EN-130916
If the resistance value is > 3 Ω, this can be due to corrosion on the
thread or flange or the thread was covered e.g. with teflon tape.
Check the connection to the vessel. If there is no connection, you can
connect a cable from the outer ground terminal to the vessel.
Keep in mind that coated flanges must always be connected via the
ground terminal to the vessel.
Contact 7 against contact 1 (middle pin)
The resistor must be infinite (> 10 MΩ)
If the resistor is lower, then moisture can be penetrated or the com-
pensation capacitor or variable capacitor (phase) is defective.
Contact 3 (screen) against contact 4
The resistor must be 2 MΩ.
In case of lower values, the electrode insulation is defective or mois-
ture is penetrated into the housing.
In case of higher values, there is a contacting error in the adapter
plate or the resistor is defective.
No fault
If you cannot find a fault in the probe, then exchange the electronics
module by a similar replacement electronics (if available).
If the fault is eliminated after inserting the new electronics module,
then you have to carry out a fresh adjustment with the new electron-
ics module because electronics modules have certain manufacturing
tolerances.
If the fault still exists or if no replacement electronics module is avail-
able, then you have to return the probe for repair.
Contact 3 (screen) against contact 1 (middle pin)
The resistor must be 2 MΩ.
In case of lower values, the electrode insulation is defective or mois-
ture is penetrated into the housing.
In case of higher values, there is a contacting error in the adapter
plate or the resistor is defective.
Depending on the reason for the fault and the measures taken, the
steps described in chapter "Set up" may have to be carried out again.
7.3 Exchanging the electronics module
If it is necessary to exchange the electronics module, you should use
an electronics module type CAP E31R
Proceed as follows:
1. Switch off power supply
2. Loosen the four screws of the housing cover with a Phillips screw-
driver.
3. Remove the housing cover
4. Loosen the screws of the terminals with a Allen wrench.
5. Pull the connection cables out of the terminals.
Reaction after fault recti-
fication