⑴ Calibrate and calibrate the pH meter before pH measurement.
(2) For at verificere nøjagtigheden af pH-meteret, f.eks. efter kalibrering af pH-meteret med pH 6.86 og pH 4.00, indsæt pH-elektroden i pH 9.18-opløsningen, og kontrollere, om instrumentets viste værdi stemmer overens med pH-værdien af standardopløsningen.
⑶Check whether the pH meter needs to be reset during the general accuracy measurement. The pH meter may drift or change after being calibrated and used. Therefore, before the test, insert the electrode into a standard buffer solution that is close to the measured solution, and determine whether it needs to be re-calibrated according to the size of the error.
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