CORRATER® probes and instruments provide a direct measure of corrosion rate and a qualitative pitting tendency of metals in electrolytes by the technique of linear polarization resistance. CORRATER® systems have the particular advantage of fast response to changes in corrosive conditions that exist within a system, so that inhibition and process changes designed to limit corrosion damage can be evaluated quickly and easily. It is generally advantageous to continuously monitor the corrosion rate with time so that system upsets may be recorded for further evaluation. The integrated corrosion rate over time can give an indication of cumulative metal loss. The polarization resistance measurement technique used in the CORRATER® system has limits of operation which depend on corrosion rate and electrical conductivity of the process media. The graph to the right indicates the recommended operation range for these systems. The area to the lower right of the curves designates the area of successful application of the technique. For process conditions to the upper left of the curves the CORRATER® technique is not recommended. In this area, the CORROSOMETER® technique for metal loss determination is recommended. In general, the output of the CORRATER® systems are not used by themselves for complete closed-loop corrosion control of water treatment programs. The corrosion rate is usually controlled by more than one factor, for example – the use of both a biocide and a corrosion inhibitor. In addition, corrosion rate changes in the system may respond slowly to treatment changes. This makes control by a single measured variable very complex. Normally, the CORRATER® systems are set up to provide corrosion rate data and alarms in conjunction with other related plant data from which the appropriate corrective action may be taken.
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