Types and Applications of Moisture Meters
Other names of moisture meter are also called moisture analyzer, moisture analyzer, fast moisture analyzer, moisture meter, moisture detector, moisture measuring instrument, and moisture analyzer. the
Moisture analyzers for chemical analysis include: Karl Fischer moisture analyzers, coulometric moisture meters, and dew point moisture meters. the
The Karl Fischer method is a classic method, also known as a trace moisture analyzer, which is mainly used in the detection of samples with low moisture content. After improvements in recent years, the accuracy has been greatly improved and the measurement range has been expanded. the
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. the
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. Manufacturers include Chengdu Instrument Factory, Jiangsu Jianghuan Company, Daqing Rishang, etc. the
Moisture Meter Application
With the development of scientific research and the progress of production technology, the quantitative analysis of moisture has been listed as one of the basic items in the physical and chemical analysis of various substances, as an important quality index of various substances. the
According to the different moisture contents in different forms of samples, different requirements for the determination of moisture are put forward. Moisture determination can be the control analysis of industrial production, or the quality certification of industrial and agricultural products; it can measure moisture from tons of products or use only a few microliters of test solution in the laboratory for moisture analysis; it can be a constant moisture analysis with a water content of several percent to dozens, or a trace moisture analysis with a water content of less than one millionth. the
The determination methods of these instruments are easy to operate, high in sensitivity and good in reproducibility, and can measure continuously and display data automatically. Foreign moisture analyzers are expensive, which some domestic laboratories and enterprises cannot afford. In recent years, many domestic instrument manufacturers have strengthened the research and practice of moisture analyzers, and achieved very obvious benefits, making the various technologies of domestic moisture analyzers approach the international level, and can meet the needs of general laboratories and enterprise production. The classical moisture analysis method has been gradually replaced by various moisture analysis methods.
Classification and scope of use of moisture meter
Moisture analyzers for physical analysis include: infrared moisture analyzers, halogen moisture analyzers, microwave moisture analyzers, needle type, and induction type.
Infrared (halogen) moisture analyzers are easy to operate, less time-consuming, and accurate in measurement results. Therefore, infrared moisture meters can be widely used in all industries that require rapid moisture determination, such as pharmaceuticals, food, feed, seeds, rapeseeds, dehydrated vegetables, tobacco, chemicals, tea, food, meat, and textiles, agriculture, forestry, paper, rubber, plastics, textiles and other industries in laboratories and production processes. The microwave moisture analyzer uses the microwave field to dry the sample, which accelerates the drying process. It has the advantages of short measurement time, convenient operation and high accuracy. It is suitable for the determination of moisture in petroleum, kerosene and other liquid samples.
The needle moisture meter uses the conductivity of the measured object to measure moisture. The higher the moisture content, the greater the corresponding conductivity. The moisture value can be measured by measuring the conductivity of the measured object. the
The inductive moisture meter is a kind of microwave moisture meter. The moisture content is high, the dielectric constant of the measured object is large, and the corresponding equivalent capacitance becomes large. The moisture value can be measured by measuring the equivalent capacitance of the measured object.
