The respective principles of 5 common moisture determination instruments
It takes a long time, so it is difficult to quickly measure a large number of samples. Therefore, for high-accuracy determination of a variety of samples, there is no need to think of anything other than an infrared moisture meter. Although there are some other electrical and optical measurement methods, they all belong to special instruments with limited measurement objects. From the perspective of versatility, they are far inferior to infrared moisture meters.
Scope of application: It can measure food-related items such as grains, starch, flour, dry noodles, brewed products, seafood, processed fish products, processed edible meat products, seasonings, desserts, hearts, dairy products, dry foods, vegetable oils, and pharmaceuticals , ore sand, coke, glass raw materials, cement, chemical fertilizers, paper, pulp, cotton, various fibers and other industrial products.
3. Dew point moisture meter:
The dew point moisture meter is easy to operate, the instrument is not complicated, and the measured results are generally satisfactory. It is often used for the determination of trace moisture in permanent gases. However, this method has a lot of interference, and some easy-to-cool gases, especially when the concentration is high, will condense before water vapor and cause interference.
4. Microwave moisture meter:
The microwave moisture analyzer uses the microwave field to dry the sample, which accelerates the drying process. It has the characteristics of short measurement time, convenient operation, high accuracy, and wide application range. It is suitable for grain, paper, wood, textiles, and chemical products. The moisture determination in powdery and viscous solid samples can also be applied to the determination of moisture in petroleum, kerosene and other liquid samples.
5. Coulomb moisture meter:
Coulometric moisture analyzers are commonly used to measure the moisture contained in gases. This method is easy to operate and responds quickly, and is especially suitable for the determination of trace moisture in gas. If it is determined by general chemical methods, it is very difficult. However, the electrolysis method is not suitable for the determination of alkaline substances or conjugated dienes.
