What is the protection liquid of the PH meter?

Often help customers solve some problems, but there are still many customers who are using, do not understand this knowledge. Because most of them are recorded on the Internet, people do not know where to look. Today I also saw some problems with the PH meter that most of my friends raised on Baidu. I helped explain it. as follows:

Q: What is the protection liquid of the PH meter and how is it configured? Can I use a corrected buffer instead?

answer:

1 The PH meters are the same. No matter what the model is, the same protective liquid is generally used to protect the electrodes of the PH meter because their principle of use is the same. The protection solution is a 3.3 mol/l KCl solution, the main component of which is KCL.

2 In general, it can be purchased in the market. It has a direct configuration, but it is best to buy it back and use it. The following is the correct configuration method:
Take a pack of PH4.00 buffer (commercially available, in powder form, in bags), dissolve in 250 ml of pure water, and add 56 grams of analytically pure KCL. Heat appropriately and stir until completely dissolved.

3 Absolutely no substitute for this because they are two components, the buffer is without KCl solution, it is simply a ph reagent and deionized water configuration. Do not confuse.
This issue is mentioned here, after which there are more common usage issues. The author of this article will enumerate again, please pay attention to the official website.

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