Introduce the calibration procedure of conventional pH meter
The calibration procedure of conventional pH meters is more commonly used for online pH meters and experimental pH meters that we often use. It is suitable for affordable pH meters for public consumption.
(1) Prepare a suitable pH standard solution in the laboratory, choose any two of PH4.01, PH6.86 or PH9.18, and select the standard solution according to the fluctuation range of the on-site water sample. If the on-site water quality is often acidic, choose two standard samples of PH4.01 and PH6.86; if the on-site water quality is often on the alkaline side, select two standard samples of PH6.86 and PH9.18. Humidity sensor probe, , Stainless steel electric heating tube PT100 sensor, , Cast aluminum heater, Heating ring Fluid solenoid valve
(2) Take out the sensor from the site and clean the glass electrode of the probe with clean water.
(3) Pour the two standard solutions into the two prepared beakers.
(4) Immerse the electrode into the first standard solution, open the instrument menu, and calibrate the first point. Different brands of instruments have different operation methods for the calibration menu. Operate according to the accompanying instructions.
(5) After passing the two-point calibration, rinse the electrode with clean water, then put the electrode into the first standard solution, flip the meter menu, and calibrate the point.
(6) After the two-point calibration is completed, different brands of instruments will display in different ways whether the instrument has passed the calibration or is qualified.
(7) If it passes, put the electrode back into the liquid to be measured and put the meter into operation.
(8) If the meter calibration fails, repeat the above calibration process again. If it still fails, replace the pH electrode. The life of pH electrode is generally about two years.
