Manganese Dioxide Reference Electrode
About the RB15
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.
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 office. Measurements may also be performed by use of a handheld volt meter with high input impedance (>100 MΩ).
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. It can be used in most environmental conditions. The side holes in the monitoring tip ensure good contact with the concrete.
Technical specifications
| Dimensions | 75mm long × 16mm diameter |
|---|---|
| Potential | Nominally +170mV ±20mV wrt SCE at 20°C |
| Drift | <3mV in 24 hours; typically less than ±10mV expected over 20 years |
| Cable optional | 2.5mm² XLPE/XLPE or XLPE/PVC, blue/blue |
| Design life | 50+ years |
| Shelf life | Nominally 12 months |
| Storage | Dry and at constant temperature (5°–45°C) |
| Calibration | Each electrode calibrated before delivery; calibration certificate issued |
Why us
30 years of proven performance
Trading since 1994
Over 30 years manufacturing reference electrodes. Our earliest installations — supplied in 1994 and 1995 — are still performing in harsh environments today.
Calibrated & certified
Every electrode is individually checked against a master reference and supplied with a calibration certificate traceable to ISO 12696:2022.
Made to order
Manufactured to your specified cable lengths, sizes and configuration. We advise on specification and get back to you within 24 hours.
Shipped worldwide
Supplied to infrastructure projects in 45+ countries — from UK motorways to the Burj Khalifa. Exported from the UK via DHL courier.