Operating Procedures for pH Meters
1. Calibrate the standard value of pH 6.86. Rinse the composite electrode with deionized water and dry it with filter paper. Pour 2-5 mL of pH6.86 standard solution into a plastic beaker that has been washed with water and air-dried, wash the beaker and the composite electrode and then pour it out, then add 20 mL of pH6.86 standard solution into the plastic beaker, and insert the composite electrode into the solution , use the instrument positioning knob to adjust the reading to 6.86 until stable.
2. Set temperature compensation Wash the composite electrode with deionized water, dry it with filter paper, measure the temperature of pH4.00 solution with a thermometer, and adjust the temperature compensation knob of the instrument to the measured temperature value.
3. Calibrate the pH4.00 standard value and slope. Pour 2~5mL of the pH4.00 standard solution into another plastic beaker, wash the beaker and the composite electrode and then pour it out, then add 20mL of the pH4.00 standard solution, and insert the composite electrode into the solution , after the reading is stable, use the slope knob to adjust to pH 4.00. It should be noted that after the slope knob is adjusted, it must not be moved.
4. Temperature measurement Use a thermometer to measure the temperature of the liquid to be measured, and adjust the temperature compensation of the instrument to the measured temperature.
5. Reading Insert the composite electrode into the solution to be tested and read the pH value, which is the pH value of the solution to be tested.
