Cathodic Integrity Measurement Capabilities

Each CIM unit has eight auto-ranging analog inputs. Our unique design allows the CIM to simultaneously measure AC and DC potentials, allowing for highly adaptable configurations.

Below is a sampling of the types of measurements that can be monitored.

Rectifier DC voltage -- This is the output voltage of the CP rectifier as measured across the output terminals located at or in the CP rectifier.

Rectifier DC current -- This is the output current of the CP rectifier. It is determined by measuring the voltage drop across a shunt of known resistance located at or in the CP rectifier and applying Ohm’s Law.

Rectifier Input AC voltage -- This is the input voltage to the rectifier and will usually be 1, 2, or 3 phases of 120VAC as specified by the CP rectifier manufacturer for normal operation. We monitor all available phases.

Structure-to-Soil Potential -- This is the potential of the protected structure with the CP current applied. This potential is usually referenced to a copper-copper sulfate (Cu/CuSO4) reference electrode located a prescribed distance from the CP equipment. Our measurement is both AC and DC across a differential input.

AC/DC Measurement -- These are general purpose differential inputs that measure both AC and DC values, from millivolts through hundreds of volts. Applications include evaluating AC noise, DC offsets, critical bonds, Kirk Cells, etc.

Auto-ranging -- The CIM unit will automatically adjust the measurement range for each of the above inputs independently to a maximum of ±300 volts.

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Data Sheet: Cathodic Integrity Monitor