Determination of Grain Moisture with Handheld Rapid Moisture Meter
Moisture in grain is very important for the composition of grain grain, and also plays an important role in maintaining the life activities of grain grain itself and maintaining color, fragrance and quality. Reasonable control and control of grain moisture is of great significance to scientific grain preservation. Because of this, in the formulation of national grain and oil standards, there are strict scientific definitions for the formulation of moisture indicators. Grain moisture refers to the general term for the water content in grain and oilseeds. In the storage work, grain moisture is divided into three types: safe moisture, semi-safe moisture, and dangerous moisture. According to its structure, it can be divided into free water (free water) and bound water (bound water). Free water exists in the cells and capillaries of grains and oils. It has the properties of ordinary water and is very unstable in grains and oils. It increases or decreases with changes in environmental temperature and humidity, and participates in the physiological and biochemical reactions of grains and oils. During the storage of grain and oil, the change of moisture is mainly the change of free water. Generally, the result of water test is free water. The nature of bound water is relatively stable. The moisture contained in the grain and oil that has reached a safe moisture content is basically bound water. At this time, the life activities of the grain and oil grains are very weak, and the storage is relatively stable. The handheld moisture analyzer is an important instrument for determining the moisture content of grain.
Hand-held moisture analyzers, like other testing instruments, should enjoy the same testing indoor environment. Ordinary units often only pay attention to balance and non-compulsory inspection instruments, think that hand-held rapid moisture analyzers are not regular inspection instruments by technical supervision departments, and ignore their due maintenance and correct use. First of all, its technical files should be established to ensure the extension and accuracy of its use. Secondly, there should be normal temperature, humidity and cleanliness. In view of its flexible and fast particularity in autumn grain purchase and drying tower inspection, it should be kept at the temperature and humidity during normal inspection as much as possible. Excessive temperature and humidity will affect its accuracy, especially in the inspection of the drying tower follower, it should be separated from the workshop and placed with a cover to make it moderate in temperature and humidity, clean and hygienic.
The use of the handheld moisture analyzer requires that the sample temperature, ambient temperature, and instrument temperature be as consistent as possible. First of all, in the autumn grain purchase, since the north is in the grain depot purchase season, the indoor and outdoor temperature difference is usually between 40°C and 50°C. In this way, from sample extraction to actual measurement, under the premise of required detection speed, because the instrument is adjusted by itself, it is difficult to adjust it in a short time, and the moisture result is 1.0~2.0 higher than that of the standard method. Therefore, a reasonable degree must be grasped. Secondly, in the drying inspection, because the drying and precipitation use mechanical high temperature to evaporate and dissipate a large amount of free water in the corn structure, so as to achieve the goal. Like this, the tower ration temperature is higher, and it is necessary to take a test sample in a suitable flow port for cooling, so that the three temperatures can be kept basically the same.
