Long term performance of reference electrodes for cathodic protection of steel in concrete

This paper will report on long term behaviour of potential sensors used in cathodic protection steel reinforcement concrete. Cathodic (CP) systems, both impressed current CP (ICCP) and galvanic (GCP), need regular testing to establish the quality protection. In addition, ICCP may require adjustment output voltage or current. Various types have been relatively large numbers, comprised true reference electrodes (RE) based silver/silver chloride Mn/MnO 2 decay probes (DP) a.o. activated titanium. Failures occur due loss contact, drying out cable defects. Test methods for are discussed. Monitoring about one hundred systems with several thousands over more than ten years allows analyse their performance failures. It appears that limited numbers fail time, but some cases an insufficient number working left properly monitor a system zone. is recommended install strictly needed order allow failures maintain testability save high cost installing new later.