4-probe monitoring system for early warning of the onset reinforcement corrosion.
The CorroWatch is a multi-probe device consisting of four black steel bars acting as anodes and a noble metal as the cathode. It is attached to the rebars with plastic strips and the anodic bars are positioned at different elevations and when concrete is cast, CorroWatch allows determination of corrosion activity as a function of cover distance. The height of the anodes may be adjusted according to the thickness of the concrete cover.
In order to predict when corrosion activity has reached the anodes, the current between the individual anodes and the cathode is measured, either with a handheld Zero Ohm Ammeter or a datalogger. When corrosion starts, the measured current increases significantly.
It can also work along with the ERE-Probe (see technical data sheet) for monitoring of the electrical potentials in the anodes.
Reinforcement corrosion monitoring.