IR-Free Reference Electrode (CRE-AG-7)

CerAnode’s CRE‑AG‑7 IR-Free Reference Electrode is an IR‑free reference electrode with a silver/silver chloride (Ag/AgCl) sensing element, designed to deliver precise structure potential measurements in impressed‑current cathodic protection (ICCP) systems. “IR‑free” means it minimizes the influence of voltage drop (IR) in the measurement, giving a truer reading of structure polarization.

Its sealed, stable design enables long-term deployment in buried, water‑immersed, or exposed CP monitoring stations.
Engineered for accuracy and durability, the CRE‑AG‑7 helps monitor polarization without interference from contact resistance or noisy potentials.

Key Features & Benefits

Materials & Construction:

Silver/Silver Chloride Element: Uses Ag/AgCl chemistry for a well-established and stable reference potential, especially suited for chloride‑bearing environments.
Sealed & Porous Junction: A ceramic or frit tip allows ionic exchange while keeping the internal cell isolated from external contamination.
Robust Housing: Durable body built for long-term installation, protecting the reference internals from mechanical stress and environmental hazards.

Electrical Performance:

IR‑Free Measurement: Designed to minimize IR drop, allowing for more accurate “on” and “off” potential readings in CP systems.
Low Polarization: Maintains stable potential even under applied currents, preserving measurement integrity.
Signal Stability: High‑quality internal wiring and reference junction reduce drift, giving reliable readings over many years.

Durability & Environment:

Long Service Life: Ag/AgCl system is proven for multi-year deployments in CP environments.
Chloride-Tolerant: Well suited for environments with chloride ions, such as marine or brackish waters, thanks to Ag/AgCl chemistry.
Environmentally Protected: Sealed design helps protect the internal electrolyte and junction from soil, moisture, and contaminants.

Monitoring & Integration:

Ready for CP Stations: Compatible with test posts, junction boxes, remote loggers, and other CP monitoring infrastructure.
Custom Cable Options: Can be supplied with a variety of cable types, lengths, and insulation to match your system needs.
Continuous Monitoring: Perfect for permanent deployment, providing continuous or periodic potential feedback without removal or replacement.

Applications

Permanent structure potential monitoring on buried pipelines
CP test stations on storage tanks to verify polarization
AC mitigation systems where “IR-free” measurements are needed to validate interference suppression
Marine or tidal structures (piles, docks) where accurate Ag/AgCl potentials are beneficial.
Remote or critical infrastructure where stable reference points are required for integrity monitoring

Installation & Accessories

Mounting the Electrode: Place in a CP test post, junction box, or designated monitoring station with good ionic contact.
Cable Routing: Run lead cables protected, properly strain-relieved, and sealed to prevent water ingress and corrosion.
Junction Box Connection: Connect to a CP monitoring junction box or data logger—ensure polarity and grounding are correct.
Commissioning: Record initial “on” and “off” potential readings under no‑load and loaded conditions to establish baseline.
Periodic Checks: Measure continuity, verify stable potential, and inspect the junction for contamination or degradation.
Replacement & Maintenance: While the CRE‑AG‑7 is designed for long life, replacing the electrode or refilling (if possible) can restore optimal performance.

Documentation & Resources

Technical Data Sheet

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Case Studies

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