ABB achieves MCERTS for pH measurement

We are delighted to have achieved MCERTS certification for our AX400 pH measurement system, which forms part of our commitment to providing users with the best available techniques for their environmental monitoring requirements.

Tested in a field trial conducted over a period of 9 months on an effluent discharge at Pembroke Power Station, the AX400, coupled with our 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 our 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 minimize 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.

For potable water treatment applications, accurate and stable pH measurement is required for optimum control at the coagulation stage of the process to minimize coagulation costs and treated water quality.

Measuring pH in coagulation processes can be particularly difficult, due to the high level of suspended solids and significant precipitation that can block the reference junction.

To overcome this problem, an ideal pH system should include an optional flowing reference junction that overcomes KCI depletion and blockage. Other features should also include simple reference junction replacement to enable low-cost maintenance in samples that contain high levels of particulates, and the availability of a low resistance glass electrode option to provide fast response in low temperature applications.

The 7600 Series meets all these requirements. The 7651, with polypropylene flowcell and the 7653, with a reservoir-fed reference electrode are an ideal low-cost option that can be readily replaced and installed. Both systems are highly-suited throughout the potable water treatment process.

For more information, email moreinstrumentation@gb.abb.com or call 0870 600 6122 ref. ‘MCERTS pH’.

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