Precautions for use of ph meter
1. Under normal circumstances, when the pH meter is used continuously, it needs to be calibrated once a day; generally, the instrument does not need to be calibrated within 24 hours.
2. Before use, pull down the rubber sleeve on the upper end of the electrode of the pH meter to expose the small hole on the upper end.
3. The calibration buffer solution generally uses a pH=6.86 solution for the first time, and a buffer solution close to the pH value of the measured solution for the second time. If the measured solution is acidic, the buffer should be pH=4.00; When the solution is alkaline, choose a buffer with pH = 9.18.
4. When measuring, the leading wire of the electrode should be kept still, otherwise it will cause unstable measurement.
5. Do not soak the electrode in distilled water. If the electrode used by the pH meter is a new electrode or an electrode that has not been used for a long time, it must be soaked in distilled water for several hours before use, so that the asymmetric potential of the electrode of the pH meter can be reduced to a stable level, thereby reducing the electrode’s internal resistance.
6. When the pH meter is measuring the pH value, it is necessary to ensure that the bulb of the electrode completely enters the medium to be measured, so as to obtain more accurate measurement results.
7. When using the PH meter, remove the rubber stopper at the solution filling port of the reference electrode
