What are the ways to extend the lifespan of pH meters used in high-temperature process media?

Can the medium be taken out for cooling before testing?

The last edit to this post was made by qugd on 2011-3-20 at 09:42. To measure the pH of media with high temperatures, the following factors need to be taken into consideration: 1. If the medium is pure water, such as steam condensate, boiler feedwater, or boiler drainwater, measures such as using branch pipes or bypass systems for sampling, reducing temperature and pressure, and adjusting flow rates are generally employed. After measurement, the sample is discharged on-site, which prevents the pH probe from being exposed to high temperatures and thus extends its service life； 2. For a reaction water as the medium, sampling can be carried out through branch pipes depending on the on-site conditions of the pipelines or containers; after appropriate cooling and pressure reduction and pH measurement, the sample is returned to the main pipeline either by means of the natural pressure difference in the pipelines or by using a pump installed nearby to apply pressure ； 3. In cases where sampling through a branch pipe is not possible, a pH electrode capable of withstanding higher temperatures must be used; however, the upper temperature limit is generally around 110–120 degrees Celsius, as the internal electrodes in pH probes lose their functionality and their lifespan is reduced due to high temperatures. A gel can be used as a reference solution, but it also cannot significantly extend the electrode lifespan. Any manufacturer claiming that a product can be used for extended periods in high temperatures does so under certain conditions; it is just a matter of whether the manufacturer’s sales staff or technical personnel are able to explain these conditions to users in an honest and responsible manner. 4. In pharmaceutical and fermentation processes, there are types of pH electrodes that can tolerate temperatures of 135 degrees Celsius for short periods of time. However, such electrodes can only withstand such high temperatures during disinfection procedures outside of normal production processes; during normal operation, the temperature generally does not exceed 45 degrees Celsius. Measuring the pH of high-temperature media is not such a simple task; to obtain accurate results, appropriate costs must be incurred. You can use those products that claim to be inexpensive, but you will have to pay other costs as a result of their use. It should also be kept in mind that pH electrodes are consumable electrodes; it is normal for their lifespan to shorten under conditions of high temperature and pressure, or in certain special media, and this is not a problem with the quality of the product. An excessive focus on long battery life of electrodes is a sign of a lack of thorough understanding of the principles behind pH analysis. Those who claim that their pH electrodes have an exceptionally long lifespan that no other manufacturers can match are either **lying or simply talking without any real knowledge of the technology. Regarding the use of pH meters in various situations, I can provide excellent solutions and suggestions, but it is necessary to inquire through official channels with my company; I cannot give irresponsible explanations casually over the internet.

What was said upstairs is very good; we also use a small heat exchanger to cool the liquid samples. A pH meter with a long lifespan can last around 4 years.