A Half Cell gauge measures the condition and potential corrosion of rebars and steel structures in concrete. When corrosion occurs the ferric oxide protective layer surrounding the concrete breaks down allowing an electrochemical reaction between the steel and the concrete.

In the half cell test, the reference electrode is passed over the surface of the concrete and the potential voltage difference is recorded. The readings show where corrosion is likely to be or is currently present. Periodic monitoring of the condition of the rebars and metal supporting structures in buildings, bridges etc. identifies signs and severity of corrosion - long before there are any physical indications of damage. Thus enabling more accurate forecast of projected lifetime.

Elcometer have three half cell gauges in their range, Elcometer 331² Models BH, SH and TH - each combine the Half-Cell technology required to assess potential corrosion of rebar, with the features necessary for any covermeter. Each gauge can be connected to either Cu / CuSO4 (copper / copper sulphate) or Ag / AgCl (silver / silver chloride) half cell electrodes and, by using the on screen menu commands, change the gauge to record covermeter depth measurements.

Combining half cell corrosion potential measurements with depth of cover measurements, in one easy to use gauge, makes the Elcometer 331 models the ideal surveying products of their type in the market today.

Elcometer offer a comprehensive range of concrete inspection equipment to meet all of your requirements.