The pH-value measurement is a proven laboratory method for the indirect determination of concentration or density.



The advantage of this method is, it is very inexpensive. PH technology (pH-meter) has the following disadvantages:

• direct contact of the sensitive membrane with the process is necessary
• time drift behavior requires ongoing calibration effort as well as expansive sample fittings and retractables
• high drift requires continuous calibration effort as well as extensive and expensive mounting and sampling technology
• not suitable for typical concentration measurement ranges above 1 % by weight
• pH sensors consist of glass. Because of this fragile material, the application in some processes like food or pharmaceutical is very critical.

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