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Edward Lowton
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| Home> | Plant, Process & Control | >Sensors and instrumentation | >MCERTS for pH measurement |
MCERTS for pH measurement
31 May 2015
ABB has achieved MCERTS certification for its AX400 pH measurement system. Tested in a field trial conducted over a period of nine months on an effluent discharge at Pembroke Power Station, the AX400, coupled with ABB’s 7650, 7651, 7660 pH sensors, successfully demonstrated its suitability for use in treated wastewater, untreated wastewater and receiving water applications.
The achievement of MCERTS certification means that ABB’s AX400 pH measurement systems can be used in applications such as the power industry and potable water treatment. The measurement of pH and Redox (ORP) in high purity water applications in power plants requires a number of essential elements to achieve accurate and stable readings. These include a stainless steel flowcell to minimise static effects and a reservoir-fed reference junction that overcomes KCI depletion and blockage to ensure a stable junction potential and simple reference junction replacement for low-cost maintenance.
The 7660 system has been proven to meet all these requirements by providing accurate measurement in samples below 20 μS/cm. This is especially ideal in boiler chemistry control applications, which require close control of pH levels. For applications up to 100 μS/cm the 7651 with polypropylene flowcell and the 7653 with a reservoir-fed reference electrode option provide an economical option.
