![]() Although pH sensors having good accuracy and minimum flow sensitivity are available, many plant chemists still regard pH measurements with suspicion. Low conductivity and lack of buffer capacity make the measurement sensitive to contamination, electrical interference and sample flow changes. Measuring pH in condensate, feedwater and boiler water can be a challenge. Inferred pH is attractive because under certain conditions it can eliminate the need for direct measurement of pH in feedwater and boiler water. The method is not widely used in the United States, but is popular in Europe. Inferred pH is a method of continuously calculating pH from straight and cation conductivity. Two common methods are used, but errors can occur if the sample and the model do not match.īy Joe Covey, Power Industry Product Engineer, Emerson Process Management, Rosemount Analytical
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