In many liquid chemical products and intermediates, moisture content is one of the important indicators of product quality. Excessive moisture will destroy chemical reactions, produce by-products, reduce yield, and determine the moisture content of ethyl ester before compounding. Very important. Accurate determination of moisture content in the product not only avoids quality problems in production in advance, but also minimizes losses, and can be negotiated with raw material manufacturers to return products that are not applicable. The instrument for measuring moisture is called a moisture analyzer, and the following is a description of the moisture meter in the chemical product moisture test application.
The moisture analyzer is divided into the following types according to the test method: infrared drying method, halogen rapid moisture meter type instrument, Karl Fischer Coulometric method and the like. How to choose the right moisture analyzer? It can be arranged according to the cost performance. It is best to consider the automatic instrument when choosing, so as to avoid unnecessary errors. Consideration should be given to purchasing a fully enclosed test system. Exposed Karl Fischer reagents are very easy to absorb water due to the presence of iodine. Samples to be tested should also avoid errors caused by the incorporation of moisture into the air. Consideration should also be given to the life of the metering pump. The metering pump is a key part of the volumetric moisture meter. Karl Fischer reagent is a highly corrosive reagent. Try to buy a metering pump made of corrosion-resistant materials such as fluoroplastic to prevent leakage and cause the instrument. scrapped. The electrode belongs to the core component of the instrument. On the one hand, it should have high sensitivity. On the other hand, because it is immersed in the test cell during the test, it is better to choose a high-quality platinum electrode instrument to maintain the electrode life.
In order to get accurate test results, it is necessary to strictly follow the rules. Pay special attention to the system's full containment problem, accurate sampling problem, magnetic stirring speed adjustment, titration speed setting should be fast and slow, use methanol instead of water to clean the system, away from strong magnetic fields and other issues.
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