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

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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.