In basic terms, pH is a measurement of the relative amount of hydrogen and hydroxyl ions in an aqueous solution using measuring and reference electrodes with an analysis and display unit for calculating and displaying pH readings. These systems may be stand alone or form part of a more sophisticated control system to ensure that pH is maintained at a certain level. The aggressive nature of many pH measurement applications means that periodic maintenance and checking are required as a matter of good practice to ensure continued accuracy.


ABB (2012) The ABB Guide to Fast pH Measurement
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