Jekk il qari huwa instabbli, kif spiss għandu il pH meter be ikkalibrat?
The pH meter reading is inaccurate. How often should the acidity meter be calibrated? The inaccurate reading can be attributed to two reasons: during the operation and maintenance of the pH electrode. 1, Detailed analysis of pH meter electrodes: 1. Is it calibrated before measurement; If the calibration is not good at once, it can be repeated. Refer to the 3-point calibration in the manual of the digital instrument. What should be done for the third point calibration of the pH meter? If calibration is not possible, consider changing the electrode. 2. Electrode bubbles are contaminated and need to be cleaned properly: If the tested solution contains substances that are prone to contaminating sensitive bubbles or blocking the liquid interface, causing electrode passivation, the slope will decrease and the display reading will be inaccurate. If this phenomenon occurs, the electrode should be cleaned with an appropriate solution according to the nature of the pollutant to restore its original state. The cleaning steps can refer to the official website above. 3. Before immersing the electrode into each test solution, it should be washed with distilled water and the adhesive should be carefully removed with absorbent paper to avoid contamination and dilution of the test solution, which may cause inaccurate measurement and analysis. 2, Simplified analysis: 1. The pH meter probe is dirty and needs to be cleaned. 2. Loose wiring 3, aging of the pH meter 4, large fluctuations in the measured liquid 3. The main reason is that the number of ions in the solution is too small, resulting in unstable readings, such as pure water. Of course, it may also be a problem with the instrument 1. The pH meter has not been cleaned thoroughly and there are residual reagents 2. There are reactions in the solution 3. The solution has not been shaken well 4. How often should the acidity meter be calibrated? Here is a distinction between whether you use it in industry or in the laboratory. 1. If it is used in industry to continuously measure solution media, there is no need for calibration. If it is removed from the original packaging and then reinstalled, it needs to be recalibrated or calibrated again. 2. The laboratory uses a pH meter, which requires high accuracy. Of course, each experiment you conduct is different, so it needs to be recalibrated before each use.
