Proper pH adjustment is critical for many chemical processes.
Therefore, accurate pH measurements are crucial. To get accurate
measurements you need clean and fresh pH electrodes.
It is a known fact that pH electrodes must, from time to time, be
calibrated to maintain measurement accuracy. In a laboratory, you
general calibrate your pH equipment before each measurement or once a
day. For an online pH measurement, in a process environment, the time
interval between calibration varies considerably with each application and its unique conditions.
The main factors that degrade the performance of an electrode are coating, contamination and aging. How often you need to calibrate your electrode depends mainly on these factors and, of course, of the accuracy you require from your measurement.
The most common problems with a pH electrode are a coated membrane or plugged reference junction.
Coating and contamination will result in a sluggish or non-responsive
electrode because your electrode doesn't deliver the right electrical potential.
To achieve an accurate pH measurement you need a clean and fresh electrode.
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