In estuarine areas and tidal river mouths where steel structures are fitted with a Cathodic Protection (CP) system the protected potentials will be unreliable if measured with regards to a standard Ag/AgCl electrode. The standard Ag/AgCl element relies on the chloride content of the water (3-3.5% NaCl/Seawater) to produce an accurate reading. Therefore, depending on the tidal condition at the time of measurement and the chloride content of the water (saltwater can become diluted by fresh water at lower tidal levels) the potential measured with a standard Ag/AgCl electrode can vary dramatically.

 

To overcome this issue Silvion have developed the WE100-PBW and the SW200 electrodes which have a predetermined 0.5M KCl internal electrolyte to mitigate the problem of diluted chloride concentration in the water. Ionic continuity to the environment is via a microporous sintered disc. The WE100-PBW sintered disc is protected by a perforated screw cap containing a woven E-glass, whereas the SW200 is fitted with a perforated cap and porous sponge to protect the sensing disc from mechanical damage. Both electrodes are the ideal choice for use in seabed sand, seabed mud and estuary mud and waters. 

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Typical applications: estuary and tidal river industrial installations and jetties etc. 

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