
pH Calibration Tips
Posted on August 8, 2019
Experts at Ohaus have put together a list of tips on pH calibration. Highlights include the following:
- How often does the pH electrode need to be calibrated?
- The frequency of electrode calibration is dependent on the precision requirement, sample temperature, surrounding environment and process arrangement of sample test (for example, interference ingredient, flushing and storage, etc.).
- In order to ensure the accuracy of measurement results, we recommend you calibrate it frequently, preferably one calibration or verification every 10 measurements.
- If the sample has a complex composition or the electrode is used frequently, you should increase the frequency of calibration.
- What should be done if the pH calibration slope is higher than 105%?
- Check the buffer solution’s expiry or whether it has been polluted. If it expired, use a new buffer solution.
- Check whether you have selected the correct buffer solution.
- The buffer solution group is set wrong. Select the correct buffer solution group as per the buffer solution used.
- Why does the result of pH measurement fluctuate for a long time?
- Generally, it requires 1-4 minutes for the reading of a pH measurement to be stable. If it exceeds a reasonable time, then see the following:
- The selected pH electrode cannot handle the present sample.
- Electrode is aged.
- Generally, it requires 1-4 minutes for the reading of a pH measurement to be stable. If it exceeds a reasonable time, then see the following:
The Ohaus Starter 5000 pH Bench Meter offers everything you need for accurate pH measurement.
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Manufacturer: Ohaus
Industries: Food / Beverage, Plastics
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