Debugging of pH meter
The pH meter|acidity meter commonly used in the laboratory has the old-fashioned domestic Leici 25 acidity meter with a minimum division of 0.1 units and the pHS-2 type pH meter|acidity meter with a minimum division of 0.02 units. The pH value of this type of pH meter|acidity meter It is displayed by the meter pointer. The new digital PH meter | acidity meter has the KL series of the domestic Kelilong company, and its set temperature and pH value are displayed in digital form on the screen. No matter what kind of pH meter|acidity meter needs to be calibrated with standard buffer solution before use.
First read the instruction manual of the instrument, turn on the power, and install the electrodes. Add a standard buffer solution with a pH value of 7.0 into a small beaker, immerse the electrode, and shake the beaker gently to make the solution in contact with the electrode uniform. Read the pH value of the solution according to the instructions attached to different pH meters|acidity meters, and check the pH meter|acidity meter so that the reading is the same as the actual value of the standard buffer pH7.0 and is stable; then remove the electrode from the solution Take it out and fully rinse with distilled water, replace the small beaker with a standard buffer solution of pH 4.01 or 0.01, immerse the electrode, and repeat the above steps to make the reading stable. This completes the dual-point calibration; after calibration, rinse the electrode and beaker with distilled water. Do not turn the positioning adjuster after calibration, otherwise recalibration will be necessary.
