Embeddable half-cell reference electrode for monitoring the thermodynamic probability of rebar corrosion.
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Embeddable half-cell reference electrode for monitoring the thermodynamic probability of rebar corrosion.
The Geolook G94-900CP Open Circuit Potential (OCP) sensor is a permanent reference electrode designed to be embedded in concrete structures. It measures the electrochemical potential of the reinforcing steel relative to a stable reference point, providing a direct indication of whether the steel is in a "passive" (protected) or "active" (corroding) state. By monitoring the potential difference over time, engineers can detect the breakdown of the protective oxide layer on the rebar due to chloride ingress or carbonation, even before physical damage like cracking or spalling becomes visible on the concrete surface.
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Corrosion is an electrochemical process. When rebar starts to corrode, it acts like a battery, creating a negative electrical potential. The G94-900CP acts as the 'ground' or reference point of that battery.
By measuring the voltage difference (potential) between the rebar and our stable reference electrode, engineers can consult standard charts (like ASTM C876) to determine if there is a high (>90%), uncertain, or low (<10%) probability of active corrosion.
Depending on the environment, we offer two primary sensing elements:
One of the biggest challenges in infrastructure is that corrosion happens inside the concrete. By the time you see a crack or a rust stain, the structural integrity may already be compromised. The G94-900CP provides 'early warning' data, identifying the chemical onset of corrosion years before physical symptoms appear.
The G94-900CP is typically installed in arrays across a structure. The sensors are wired back to a high-impedance data logger (such as the Geolook GL-DL series), which ensures the measurement itself doesn't drain the very small currents being measured, maintaining the accuracy of the structural 'health map'.
Corrosion is an electrochemical process. When rebar starts to corrode, it acts like a battery, creating a negative electrical potential. The G94-900CP acts as the 'ground' or reference point of that battery.
By measuring the voltage difference (potential) between the rebar and our stable reference electrode, engineers can consult standard charts (like ASTM C876) to determine if there is a high (>90%), uncertain, or low (<10%) probability of active corrosion.
One of the biggest challenges in infrastructure is that corrosion happens inside the concrete. By the time you see a crack or a rust stain, the structural integrity may already be compromised. The G94-900CP provides 'early warning' data, identifying the chemical onset of corrosion years before physical symptoms appear.
Depending on the environment, we offer two primary sensing elements:
The G94-900CP is typically installed in arrays across a structure. The sensors are wired back to a high-impedance data logger (such as the Geolook GL-DL series), which ensures the measurement itself doesn't drain the very small currents being measured, maintaining the accuracy of the structural 'health map'.
We are currently updating the specific model configurations and technical datasheets for this product category.