Accurate pH adjustment requires
an uncontaminated and
well maintained electrode

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.

Calibration interval

pH adjustment

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.

pH electrode coating

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.

Share your point of view with others!

Take the opportunity to share your knowledge and experiences with others.

Please, use the form below to publish your contribution about the subject "Calibration interval". Before your page is published, it will be reviewed to make sure it applies to the submission guidelines for this website.

Don't forget to read what others have written, maybe you have a comment to add.

What Other Visitors Have Said

Click below to see contributions from other visitors to this page...

How often do I recalibrate 
No hard and fast answer can be given to this question. Like cleaning, the frequency at which pH electrodes should be calibrated can be determined only …

Click here to write your own.

Favorite pages:

acids and bases
What is an acid? What is a base? If you want to know, read here!

calculating ph
Do you know what pH stand for? If not, click here!

electrode design
The pH electrode consists of the following parts:
. . read here!
offset error
Real-world pH electrodes are not ideal,
read why.

definition of ph
What is the definition of pH? See the answer. . .

nonglass ph electrode
Is it not possible to use a glass electrode for your application? Use a non-glass pH electrode.

ph measurement
Learn how the temperature affects your pH measurement.

clean ph electrode

Download the new release ISO 14001:2015