One-point calibration of pH meter

Any pH meter must be calibrated with a pH standard solution before it can measure the pH value of the sample. For samples with a measurement accuracy below 0.1 pH, the one-point calibration method can be used to adjust the instrument. Some instruments have an accuracy of only 0.2pH or 0.1pH, so they only have a "positioning" adjustment knob.

The specific steps for one-point calibration of water pH meter are as follows:

1. Measure the temperature of the standard buffer solution, check the meter to determine the pHs value at this temperature, and adjust the temperature compensation knob to this temperature.

2. Rinse the electrode with pure water and dry it.

3. Dip the electrode into the buffer solution and shake it, then place it still. After the reading is stable, adjust the positioning knob so that the instrument displays the pHs value of the standard solution.

4. Take out the electrode, rinse and dry it.

5. Measure the sample temperature and adjust the temperature compensation knob of pH meter to this temperature value.

6. Immerse the electrode into the sample solution, shake it and place it still, and check the reading after stabilization.

pH water tester is a widely used instrument to measure the pH value of minerals, substances in water or of organism. It is widely used in environmental engineering, food science, medicine, agriculture, water treatment, life science and other fields.