The liquid level meter, ultrasonic detector and pressure measuring instrument are used to measure the material difference in the container and calculate the material storage. According to the production process and technical requirements, the material difference signal obtained by the testing instrument is obtained, and the import and export executing parts (such as pumps, valves, etc.) are automatically controlled by signal amplification. The material is effectively measured and controlled. Its characteristics are simple structure, easy operation and automatic control. It is suitable for use in occasions where material storage and metering accuracy are not required.
　　There are two methods of accurate measurement: quantitative measurement and weighing measurement.
　　Quantitative measurement: It is based on the general measurement method and principle, through improving the container structure, maximizing the liquid level difference in the measuring tube to achieve a high accuracy of 0.5% measurement of materials. It has two products suitable for different places. One is that each measuring tank can only measure one capacity, such as 20 liters, 50 liters, 100 liters, 500 liters, 1000 liters, etc. Specifications. It is suitable for the inspection and testing departments and personnel to test the accuracy of liquid flow devices and equipment, and for the occasions where the quantity of liquid flow devices and equipment is unchanged in the production process. Another kind of product which needs to be improved in order to achieve the change of quantitative number in the production process is to achieve several quantitative metering functions of a metering tank through the transformation of the internal structure of the metering tank. It is suitable for the production process and occasions of high-precision liquid metering and constant change of capacity.
　　Weighing detection and metering: Gravity metering and filling method is adopted, without calculating liquid weight. Toledo weighing sensor and weighing terminal are used to realize liquid and other raw materials proportional feeding. In order to check the accuracy strictly, the whole system is controlled by Mitsubishi or Siemens PLC. The touch screen display operation can automatically compensate the fluctuation caused by the material when it is measured. The accuracy of system measurement is controlled at 0.5%.
　　The structure types of metering tank can be divided into: vertical top and bottom head, vertical top and bottom cone, vertical flat bottom cone, vertical flat bottom flat cover, horizontal double head and horizontal flat head metering tank.