Vega VEGACAP 27 Operating Instructions Manual

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217 Maintenance and fault rectificationVEGACAP 27 • Relay (DPDT)33758-EN-170503If the resistance value is > 3 Ω, this can be due to corrosion on thethread or flange or the thread was covered e.g. with teflon tape.Check the connection to the vessel. If there is no connection, you canconnect a cable from the outer ground terminal to the vessel.Keep in mind that coated flanges must always be connected via theground 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 4The 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 adapterplate or the resistor is defective.No faultIf you cannot find a fault in the probe, then exchange the electronicsmodule 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 manufacturingtolerances.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 adapterplate or the resistor is defective.Depending on the reason for the fault and the measures taken, thesteps described in chapter "Set up" may have to be carried out again.7.3 Exchanging the electronics moduleIf it is necessary to exchange the electronics module, you should usean electronics module type CAP E31RProceed as follows:1. Switch off power supply2. Loosen the four screws of the housing cover with a Phillips screw-driver.3. Remove the housing cover4. Loosen the screws of the terminals with a Allen wrench.5. Pull the connection cables out of the terminals.Reaction after fault recti-fication