Vega VEGACAP 27 Operating instructions manual - page 21
21
7Maintenanceandfaultrectification
VEGACAP 27 • Relay (DPDT)
33758-EN-170503
Iftheresistancevalueis>3Ω,thiscanbeduetocorrosiononthe
threadorflangeorthethreadwascoverede.g.withteflontape.
Check the connection to the vessel. If there is no connection, you can
connect a cable from the outer ground terminal to the vessel.
Keepinmindthatcoatedflangesmustalwaysbeconnectedviathe
ground terminal to the vessel.
Contact 7 against contact 1 (middle pin)
Theresistormustbeinfinite(>10MΩ)
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
Theresistormustbe2MΩ.
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
Ifyoucannotfindafaultintheprobe,thenexchangetheelectronics
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)
Theresistormustbe2MΩ.
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
stepsdescribedinchapter"Set up"mayhavetobecarriedoutagain.
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. Switchoffpowersupply
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