The classical moisture analysis method has been gradually replaced by various moisture analysis methods.
There are mainly halogen moisture meters, infrared moisture meters, dew point moisture meters, microwave moisture meters, coulomb moisture meters, Karl Fischer moisture meters, and some special moisture meters. The measurement methods of these instruments are easy to operate, have high sensitivity and good reproducibility, and can measure continuously and display data automatically.
1. The infrared moisture analyzer is simple to operate, takes less time, and has accurate measurement results. Therefore, the infrared moisture analyzer can be widely used in experimental analysis, daily purchase control and process testing in chemical, pharmaceutical, food, tobacco, grain and other industries.
2. Karl Fischer's method is a classic method, also known as trace moisture analyzer. It is mainly used in the detection of samples with low moisture content. After improvement in recent years, the accuracy has been greatly improved and the measurement range has been expanded. Listed as a standard method for the determination of moisture in many substances.
3. 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 more interference, and some gases that are easy to be cooled and exchanged, especially when the concentration is high, will condense before water vapor and cause interference.
4. 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 particles of grain, paper, wood, textiles and chemical products. Determination of moisture in solid, powdery and viscous solid samples, and can also be used in the determination of moisture in petroleum, kerosene and other liquid samples
5. Coulomb moisture analyzer is often used to determine the moisture content in gas. This method is easy to operate and quick to respond, and is especially suitable for the determination of trace moisture in gas. It is very difficult to measure by a general chemical method. However, electrolysis is not suitable for the determination of alkaline substances or conjugated diolefins.
