Cathodic Protection Reference Electrodes

Cathodic Protection Reference Electrodes

Reference electrodes are used in locations where a constant, stable reference is required, as well as with constant potential rectifiers and at inaccessible locations. MATCOR manufactures a complete line of cathodic protection permanent-type reference electrodes.

Choose from a wide variety of probe-type or plug-type zinc, silver chloride or copper sulfate reference electrodes cells for condenser water box/vessel applications. We can also custom-manufacture any of our reference electrodes to meet your specific project requirements.

Copper Sulfate-CUSO4 Reference Electrodes: 
Copper sulfate reference electrodes are available in underground and freshwater styles. Since our permanent CuSO4 cells are larger than the norm, they have more copper sulfate than others and, therefore, have a longer life. We offer three basic types of copper sulfate reference electrodes:


  • Underground and water tank
  • Dimensions: 2-inch diameter x 10 inches long
  • Chloride ion trap in heat formed recess
  • Standard lead wire: 12-foot #14 HMWPE stranded copper
  • All tested for + or – 10 millivolts to standard cell


  • Basic cell is packaged in prepared backfill to retain moisture contact and cell stability
  • Model code: PRC-CU4-Ug
  • Size: 10-inch diameter x 24 inches long
  • Weight: 25 pounds


  • Basic cell has extended shield over porous plug to avoid contact with structure
  • Slots prevent buoyancy of electrode.
  • Model code: PRC-CW4

Zinc Reference Electrodes: 
Zinc has the longest life of any of the permanent type reference cells. We use hi-pure zinc to assure consistent quality and a constant conversion factor of -1.1v to CuSO4. Zinc reference cells come in the following styles:


  • Packaged in prepared backfill to maintain stability
  • Size: 10-inch diameter x 24 inches long
  • Weight: 25 pounds
  • Model code: PRC-ZU9


  • Cast in rigid backfill. It maintains stability for years.
  • Model code: ZN-CPBD-9


  • Reliable, embedded half-cell for reinforced concrete structures.
  • Standard size: 1.5-inch diameter x 2 inches long
  • Model code: PR-GR-1 

Silver Chloride-AGCL Reference Electrodes: 
Our AgCl reference electrodes are designed for use in high-chloride conditions. There are three standard types:


  • Size: 1-inch diameter x 10 inches long
  • Lead wire: 150 feet AWG #12 HMWPE
  • Model code: PRC-AGS


  • For water boxes and pressure vessels
  • Contact MATCOR with specific requirements


  • Perforated housing
  • Can be factory encapsulated in chloride-enriched concrete beam 

PRC-AGCL-ZN-X Direct Drive Dual Reference Electrode: 

The dual reference electrode consists of both a silver chloride and a zinc reference electrode, prepackaged within a tightly compacted MATCOR reference cell backfill to retain moisture contact and cell stability.

  • Designed with a unique driving cone and driving assembly to enable the dual reference electrode to be directly driven into soft soil, mud or sand to depths of 40 feet or more without the need for drilling equipment. This design is not suitable for all soil conditions – please contact MATCOR to discuss the feasibility of direct driving the anode.

MATCOR’s mission is to solve your corrosion problems. In addition to our broad range of proprietary corrosion prevention products, we are ready to assist with your corrosion engineering and field service needs, including design, manufacturing, installation, commissioning and ongoing maintenance, as well as full turnkey solutions.

To get in touch with our team of corrosion experts for more information, to ask a question or get a quote, please click below. We will respond by phone or email within 24 hours. For immediate assistance, please call +1-215-348-2974.

Contact a Corrosion Expert