pH Sensors and Electrodes “Maintaining your Yokogawa pH Monitoring System”
●When a quality pH sensor system is undamaged, cleaned and properly calibrated it will provide a measurement that is accurate and reliable. Even if an electrode is in a process that does not cause coating, plugging, abrasion or other problems, it still must be calibrated periodically to correct for aging of the sensors and the non-recoverable changes to the electrodes that take place.
●These effects of aging usually happen slowly therefore, calibration should not be necessary more frequently than about once a month. If more frequent calibration is called for, it is usually because (1) the process is aggressive; (2) the electrode cleaning process used was not effective; (3) the routine calibration was not properly executed; (4) the pH readings are temperature dependent or (5) the wrong electrodes have been selected.
●Users desire an accurate, reliable measurement with a reasonable electrode life while minimizing the frequency or complexity of maintenance that is needed. However, ensuring the electrodes are clean and calibrated will always involve some amount of maintenance.
●The measurement results obtained from dirty or faulty electrodes can be anything from slow response, to a completely erroneous reading.
●Therefore, the accuracy of the pH measurement is directly dependant upon the frequency of maintenance, and the maintenance frequency (and also the method used) is directly dependent upon the importance and/or aggressiveness of the process.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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April 1 2009 |
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TNA0918 |
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137 KB |
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