Service life of the probe for acid-base concentration meters

Not necessarily; it depends on the quality of the motor. Those from German company Mettler are of better quality than domestic ones； Depending on the medium being tested and the operating conditions, the lifespan of our pH electrodes used in water cleaning is around 7-8 years; however, their lifespan when used with organic media is only 2-3 years. In cases where the medium is dirty and prone to contaminating the electrodes, the lifespan is less than 1 year. The price of each electrode is around 4,000 yuan, so the cost is indeed relatively high.

It should be noted first that an acid-base concentration meter is not a pH meter. An acid-base concentration meter is essentially a type of circular conductivity measurement; it determines the acid-base concentration by utilizing the relationship between conductivity and concentration. I’m not sure what type of electrodes is used in the manufacturer’s facility; under ideal conditions, acid-base concentration meters should not need to be replaced for a long time. First, consider a few questions: 1. Is temperature compensation working properly? 2. Is there corrosion at the connection between the electrode and the cable, resulting in poor contact? In such a case, it’s definitely necessary to replace the electrode. 3. Could aging of the pipes or pumps during the processing lead to an excess of bubbles in the pipelines, thereby affecting the measurements?

This post was last edited by qugd on 2011-5-21 at 11:40. The person who wrote the second comment had no idea what an acid-base concentration meter is, which is why they made those elaborate statements about pH electrodes. An acid-base concentration meter is essentially a type of conductivity meter; its probe operates on the principle of electromagnetic induction, rather than using contact metal electrodes to measure ion mobility. When selecting an acid-base concentration meter, it is necessary to consider whether the sensing probe can withstand the medium and temperature being measured. Materials such as PEEK, PTFE, PVDF, and PFA are commonly used, as they can withstand regular acid and alkali solutions; however, for applications involving higher temperatures, it is necessary to consult the manufacturer to determine whether they can be used. Furthermore, the relationship between the concentration of the measuring medium and its conductivity is also affected by temperature; therefore, it is necessary to ask the manufacturer whether relevant measurements or data can be provided. If the probe is selected, installed, and used properly, and there is no mechanical damage, its lifespan can be quite long – 3 to 5 years is no problem at all. But if the selection is incorrect and the application conditions are poor, it might be ruined in just a few months.