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Does the quality ph meter digital measurement have to be calibrated
There are many types of quality ph meter digital due to the different design of electric meters, and the operation steps are different. Therefore, the operation of quality ph meter digital should be carried out in strict accordance with its instruction manual. In the specific operation, calibration is an important step in the operation of the quality ph meter digital.
Although there are many types of quality ph meter digital, their calibration methods all use a two-point calibration method, that is, choose two standard buffers: one is pH7 standard buffer, the second is pH9 standard buffer or pH4 standard buffer. First, use the pH7 standard buffer to locate the electrometer, and then select the second standard buffer according to the acidity and alkalinity of the solution to be tested.
If the solution to be tested is acidic, select pH4 standard buffer; if the solution to be tested is alkaline, select pH9 standard buffer. If the quality ph meter digital is manually adjusted, it should be repeated several times between the two standard buffers until it is no longer necessary to adjust its zero point and positioning (slope) knob, and the quality ph meter digital can accurately display the two standard buffers. pH. The calibration process ends. After this, the zero and positioning knobs should not be moved during the measurement. If it is a smart quality ph meter digital, there is no need for repeated adjustment, because the pH value of several standard buffers is stored in it to choose from, and it can be automatically recognized and calibrated automatically. But pay attention to the accuracy of standard buffer selection and its preparation.