Is the low conductivity of my process water causing issues with my pH probe?

Dokument-ID

Dokument-ID TE12898

Veröffentlichungsdatum

Veröffentlichungsdatum 05.01.2022
Frage
Is the low conductivity of my process water causing issues with my pH probe?
Zusammenfassung
pH probe function and low conductivity water
Antwort
Measuring pH in low-ionic strength water is a challenge. See the following article for details on why measuring pH is challenging in low conductivity water.
Is there information on pH measurement in high purity or low-ionic strength water?

If you notice standard pH probe values drifting or bouncing around and suspect the issue may be because of low conductivity water, follow the below steps.
  • Collect a grab sample of the process water in a bucket or beaker and place the pH sensor into that sample. 
    • This will isolate the sample from the process to ensure nothing from the process is interfering with the readings.
  • Do the sensor readings continue to drift or bounce around? 
    • If yes, add some salt (standard table salt will work just fine) and mix.  Proceed to the next step
    • If no, see the following article for how to test for ground loops  What is a ground loop?  
  • After adding salt, do your pH readings settle out and start to read as expected? 
    • If yes, the low conductivity of your water is causing issues with the pH measurement. 
    • If no, there is something else causing issues with the measurements.  Please check your sensor manual for information on sensor maintenance and troubleshooting.
 

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