Cathodic Protection Reference Electrodes

Cathodic Protection Reference Electrodes

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

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

Copper Sulfate-CUSO4 Reference Electrodes

Copper sulfate reference electrodes are available in underground and freshwater models. MATCOR CuSO4 electrodes are larger and have more copper sulfate than others, resulting in a longer life. We offer four 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
  • Lead wire: 25-foot #14 HMWPE stranded copper
  • All tested for + or – 10 millivolts to standard cell


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

Under Tank

  • Small profile for under tank applications
  • Size: 3″ dia. x 24″
  • Weight: 3 lbs.
  • Model code: PRC-CU4-UT


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

NOTE: Reference electrodes listed above represent standard sizing. MATCOR CuSO4 Reference Electrodes can also be produced to your size and lead wire type specifications.

Zinc Underground Reference Electrodes

Zinc has the longest life of any of the permanent type reference cells. We use hi-pure zinc to ensure consistent quality and a constant conversion factor of -1.1V to CuSO4. MATCOR zinc reference electrodes are suitable for underground applications.

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

Silver Chloride (AgCl) Reference Electrodes

MATCOR 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 #14 HMWPE
  • Model code: PRC-AGCL-WT

Probe AgCl 

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

Concrete AgCl 

  • Packaged in prepared backfill suitable for concrete environments 

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

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

The dual reference electrode is 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.

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