In pharmaceutical, food, chemical raw materials and other industrial sectors, the moisture content of materials has a great impact on the treatability, shelf life, quality and use of materials. Most materials have an optimum moisture content. There are also water content requirements for the storage of various grains in the agricultural sector. In addition, the moisture content is also related to the price of materials, with economic impact. It is very important to accurately measure the moisture content of materials.

The current methods of moisture measurement can be divided into two categories: indirect and direct. Indirect method is to indirectly perceive the water content of materials by measuring some physical properties of materials, such as infrared measurement of the surface reflection of materials, different materials with different water content will produce different surface reflection, and electromagnetic method uses the different dielectric constant of water and materials to indirectly measure the water content of materials. The disadvantage of the indirect method is that all the instruments using the indirect method to measure the moisture content need to be calibrated. Before measuring the unknown moisture content, the calibration curve needs to be established by measuring the material with known moisture content. The calibration curve of each material is not the same, so the use of the instrument is very tedious.

At present, the direct method to measure the moisture content is thermogravimetry. In this method, the weight of the analyzed sample is monitored on the balance, and the sample is heated by the infrared radiation source. The water content of the sample is obtained by measuring the weight change of the sample during the heating process. Using the heating weighing method, the temperature of material heating is not easy to control, the temperature is too low, the water evaporation is slow, the measurement time is long, the temperature is too high, many materials will decompose and volatilize under high temperature, resulting in the continuous reduction of weight, affecting the accuracy of water content measurement. In addition, many materials will be destroyed under high temperature, so heating and weighing method cannot be used.

In the measurement of micro moisture, the use of heating weighing method for moisture measurement requires a high-precision balance with high price. It also needs infrared heating source, corresponding to different measured material changes, the instrument needs to be calibrated, so it is not convenient to use.

Micro moisture meter adopts patented technology, which is a new method and device for directly measuring moisture content. It can measure moisture content of materials conveniently, quickly and accurately at room temperature, without heating the object to high temperature, without calibration, without high-resolution balance, and can measure moisture content up to microgram (10-6g) and nanogram (10-9g). Measurement process automation.