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M.Kremer, P.John, “Information on pH measurement” M.K.Juckheim, Fulda, Germany | May 2003 | 48 Pages | PDF 1,1 Mb Contents 1 Preface.......................................... 5 2 Basics........................................... 6 2.1 General........................................ 6 2.2 Electrochemical pH measurement................. 8 2.2.1 pH measurement electrodes.................... 8 3 Measurement...................................... 15 3.1 Arrangement of a process measurement setup..... 15 3.1.1 Electrode.................................... 15 3.1.2 Fittings..................................... 17 3.1.3 Shielded instrument cable.................... 17 3.1.4 Transmitter/controller....................... 17 3.2 Commissioning the measurement setup............ 18 3.2.1 Measurement location......................... 18 3.2.2 Measurement conditions....................... 18 3.2.3 Installation................................. 20 3.2.4 Calibration.................................. 20 3.2.5 Buffer solutions............................. 20 4 Quality assurance ............................... 22 4.1 How accurate is the pH measurement? ........... 22 4.2 Documentation ................................. 22 4.3 Maintenance ................................... 24 4.3.1 Critical effects on the reference electrode . 27 4.3.2 Critical effects on the pH electrode ........ 27 4.4 Cleaning ...................................... 28 4.5 Calibration ................................... 28 4.6 Storage of the electrode ...................... 28 5 Applications .................................... 29 5.1 Waste-water treatment plants .................. 29 5.1.1 Inlet to the plant .......................... 30 5.1.2 Biotower .................................... 30 5.2 Swimming pools ................................ 32 5.3 Electroplating plants ......................... 34 5.3.1 Electroplating baths ........................ 34 5.3.2 Decontamination ............................. 35 5.4 Power stations ................................ 37 5.5 Drinking water supply systems ................. 38 5.6 Drinking water reservoirs ..................... 39 6 Other methods of pH measurement ................. 40 6.1 Electrochemical methods ....................... 40 6.2 Optical methods ............................... 42 7 Legal aspects ................................... 43 7.1 EU Directives ................................. 43 8 Closing remarks ................................. 44 9 Source information .............................. 45
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