The anodes are fitted using a small number of self-torquing snap-nuts and have the advantage of being lightweight and easy to position. The current emitting elements of the anodes are made from mixed metal oxide on a tubular titanium substrate. This combination ensures long life and excellent wear resistance. The element is mounted in an epoxy casting with an ABS plastic backing sheet. They are rated to a depth of 140 metres.
As an optional extra, special underwater electrical connectors enable cables to be 'plugged in' to the anodes. This is particularly useful for monopile anode installation.
The element of the reference electrode is made from high purity zinc to provide a stable and accurate reading. In common with the anodes, they are installed using self torquing fixings and are rated to a depth of 140 metres.
These are mainly used for monopile structures because they are highly accurate and more stable at higher negative potentials. The system monitors the potential gradient between two electrodes which are mounted on a bracket fixed to the transition piece.
Cathelco have devised a self-torquing fastening system which speeds up the installation process and ensures that anodes and reference electrodes are securely attached at the correct level of torque.The upper section of the bolt head shears off at the predetermined torque leaving the lower section intact. The second bolt head can be used to remove the anode at a later date, if required.