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There are various precautions to perform more accurate pH measurement. To perform more accurate and precise measurement, refer to the following descriptions.
1.The pH measurement and the solution temperature
The pH value of a solution has the inherent temperature characteristics. For the pH measurement, the temperature shall be controlled as accurate as possible. If you use a compound electrode with a built-in temperature compensation electrode, which measures the temperature of the internal solution of the reference electrode, you need to allow the immersed portion of the compound electrode to sit long enough in the sample to reach the temperature of the sample.
The measurement with the constant temperature bath and temperature compensation function
(1) Use the constant temperature bath to perform the calibration/measurement steps at the same temperature of the solution.
(2) Use the temperature compensation function of the meter during the calibration/measurement steps. However, if the manual temperature compensation function is equipped, the input operation to the meter is available.
The measurement with the constant temperature bath
After the calibration in the constant temperature bath, keep securely the temperature of the bath and the sample at 25℃, and then perform the measurement. In this case, the temperature compensation and the temperature conversion are not necessary
The measurement at the ambient temperature
(1) During the calibration/measurement steps, use the temperature compensation function.
(2) If the manual temperature compensation function is equipped, the input operation to the meter is available. In addition, during the calibration/measurement steps, the solution shall be controlled at the same temperature as much as possible.
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