The E-9020 digital transmitter is designed for on-line corrosion monitoring of water systems in electrically hazardous areas, and is compatible with the same communication bus as the Microcor technology. This makes it ideal for refineries, chemical plants and process plants where corrosion must be monitored in a mixture of aqueous and non-aqueous systems. The multi-drop bus provides easy installation and more economical cable installation costs than intrinsically safe systems. The E-9020 has a patented high frequency measurement on two electrodes for compensation of solution resistance that provides the highest accuracy and widest range of operation. For reference, see ASTM G96-90(2001)e1 Standard Guide for On-Line Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods) . This compensation has been further enhanced on this instrument to make it the widest range of operation of all the RCS Corrater instruments. The most common use of the transmitter is for corrosion rate and pitting tendency in water systems. However with a set galvanic electrode, the transmitter may be operated in a galvanic monitor mode, which is particularly useful in high pressure water injection systems for detection of low levels of oxygen in the parts per billion range (ppb), where conventional dissolved oxygen meters cannot be used. With a reference electrode, the E-9020 transmitter can also be used for potential measurements, which are useful in some systems for monitoring of pitting potential to detect between active and passive conditions. The E-9020 may also be set into a potential and current noise mode for electrochemical noise studies.
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