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How to calibrate PH meter?
Generally, the PH electrode must be activated when the PH meter is not used for a long time. The activation method is to wash in the KCL solution of 3MOL for 24 hours, rinse with demineralized water, and then use the standard solution for calibration. The selection of the standard solution should be based on You usually choose the PH value of the water sample.
The following is the calibration method of the PH meter:
1, first check whether the electrode has been soaked in the electrode storage solution
2. Prepare a pH 6.86, pH 4.01, and pH 9.18 buffer solution
3, the above two points are satisfied, calibration can be performed
4, the mode as "pH" state
5. Clear the previous calibration data: Press “SETUP†key, the display shows “Clear bufferâ€, press “ENTER†to confirm
6. Press the "SETUP" key until the display shows "1.68, 4.01, 6.86, 9.18, 12.46". Press "ENTER" to confirm.
7. Carefully remove the electrode from the electrode storage solution. Rinse the electrode thoroughly with deionized water. Rinse clean and dry the surface with filter paper (Caution! Do not wipe the electrode).
8. The pH meter in the laboratory is not immersed for a long time. The electrode is immersed in a pH 6.86 buffer solution and stirred well. Wait until the value is stable and “S†appears, press the “STANDARDIZE†key, wait for the instrument to automatically calibrate, if the calibration time is too long, press the “ENTER†key to manually calibrate. After the calibration is successful, the value as the first calibration point is stored, displaying "6.86" ​​and the electrode slope information "%SlopeXX". XX shows the measured electrode slope value, which is acceptable within the 90-105% range. If there is only a larger deviation from the theory, an error message (Err) will be displayed, the electrode should be cleaned, and the above steps should be repeated to recalibrate. .
9. Remove the electrode. Repeat steps 3 to wash the electrode. Immerse the electrode in pH 4.01 buffer solution and repeat step 8. After successful calibration, the value as second calibration point is stored, display (4.016.86) and electrode slope information