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Kalibreringsvæske 4.01 pH 100ml PH40133
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Kalibreringsvæske 4.01 pH 100ml

For regelmessig kalibrering av elektroniske pH meter


What is pH? 
pH is the measurement of the concentration of free hydrogen ions in a liquid. The pH of pure water is 7. Liquids having a larger concentration of hydrogen ions than water are acid and have a pH-value of less than 7. Liquids with a lower concentration of hydrogen ions, on the other hand, are base and have a pH value higher than 7. The pH scale runs from 1 to 14. 

Maintaining a pH-meter 
Your pH-meter is a precision instrument. Proper use and appropriate maintenance are important if you are to enjoy it for a long time. Here are some things to look out for:

  • When you buy it the electrode is usually dried out. Start by letting it soak in the storage solution for 4 hours. Also fill the cap that slides over the electrode with the same storage solution after use. In this way your electrode will keep on working properly for much longer.
  • To take a measurement the pH meter must first be calibrated. The buffer solution can be used to do this. If the pH meter can only be calibrated at 1 point, use the buffer solution that is closest to your normal readings.
  • During calibration watch out that no ‘contamination’ of the buffer solution occurs – so never stick the electrode directly into the bottle, but instead pour a small quantity into a separate beaker and take the measurement in that. After calibration, pour the used beaker away and do not return the liquid back into the bottle!
  • You should preferably never touch the electrode – certainly not with your fingers. If you want to clean the electrode, do so only with a soft cloth without rubbing.
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