Corrosion Monitoring

ECI-2 Embedded Corrosion Instrument

Corrosion Monitoring of Steel Reinforced Concrete Structures Using Embedded Instrumentation

The ECI-2 is an embeddable non-destructive evaluation (NDE) corrosion-monitoring instrument. It is capable of measuring parameters important to long-term corrosion monitoring, including linear polarization resistance (LPR), open circuit potential (OCP), resistivity, temperature, and a potential related to chloride ion concentration ([Cl- ]). Each ECI-2 Instrument is a digital peripheral connected to an embedded local area network. The instruments communicate with an external data logger using the SDI-12 industry-standard protocol. The ECI-2 has many applications in the construction and maintenance of commercial and civil structures. These structures can include but are not limited to high-rise buildings, parking garages, bridges, dams, spillways, flood control channels, piers, towers, and erosion control structures. During construction, engineers, builders, and supervisors can monitor parameters such as chloride concentration, resistivity, and temperature. These parameters can identify errors at an early stage of construction. One error that may be detectable is seawater or contaminated water during the mixing of the concrete ([Cl- ]). The moisture content and temperature of the structure can be monitored during the curing process to ensure the maximum strength of the concrete. Once construction is complete, the instrument can conduct long-term monitoring of corrosion conditions over time.


The ECI-2 embeddable corrosion instrument packs five sensors into a tiny package that can be easily installed and placed wherever needed to provide adequate structure coverage—the ECI-2 During Installation in a Bridge Deck during construction. The instruments are modular and uniquely addressable allowing the system to be easily scaled to the needs of the specific structure. The ECI-2 is less susceptible to electromagnetic interference (EMI) than other corrosion probes on the market by its petite lead lengths. Much embedded corrosion probing systems rely on external electronics to drive (stimulate) the embedded probe and measure the resulting signals. Often these measurements have to be made over cables of up to 10 meters in length which can act as antennas for EMI sources such as power lines, cell phones, and radio waves. The leads between the electrodes and data acquisition electronics in the ECI-2 are only about 1 inch long and converted to digital data at the source. The data is transmitted over a digital network, which is relatively immune to interference.

ECI-2 Attributes;

  • Measures the most pertinent corrosion related parameters
  • Contains all required electrodes and electronics
  • Serves as a digital network peripheral
  • Data resistant to corruption from nearby EMI sources
  • Utilizes the SDI-12 industry-standard protocol
  • Each network connection can be up to 200 feet in length.
  • System can be powered using an optional solar collector and rechargeable battery.
  • Wireless communication is provided via an external wireless transceiver.