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Castle RB15 Manganese Dioxide Reference Electrodes

RB15 Manganese Dioxide Electrode

Note: you can also download a pdf file of the data sheet.

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You can also download a pdf file of the cable fitting procedure.

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  • Superior long life manganese dioxide based reference electrode used to measure steel potentials in reinforced concrete and steel framed buildings.
  • Ideal for monitoring cathodic protection systems to the international standard IS0 12696:2016.

General Description

The Castle RB15 Reference Electrode comprises a manganese oxide core containing an alkaline environment. This is contained in a blue nylatron casing with a cementitious mortar cap. The electrode is conditioned to provide a very stable reference electrical potential. The mortar cap ensures good contact with the parent concrete and eliminates errors due to ion diffusion.

Castle RB15 manganese dioxide reference electrodes are connected to a data logger to monitor readings which may be manually downloaded or transmitted remotely via modem to an external ‘off site’ office. Measurements may also be performed by use of a handheld volt meter with high input impedance (>100 M Ω).

The RB15 reference electrode functions as a solid state electrode (no internal gels) and does not require aggressive materials, for example chloride ions, to function.



Nominally 78 mm long x 15mm diameter


Standard cable is XLPE/XLPE blue/blue 2.5mm2.

Expected life:

50 year design life.

Shelf life:

12 months.


Dry and constant temperature (between 5° and 25°C).


Each electrode is calibrated before delivery to site and a calibration certificate issued. It is not feasible to check this calibration on site.


Supplied in minimum 10 unit packs.

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Castle Electrodes

Ann Duels House
Holyport Street
Phone: +44 (0) 208 144 6688
Mobile: +44 (0) 752 545 2382