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1. What is a volumetric flowmeter? A volumetric flowmeter is an instrument used to measure the total volumetric flow rate of gases and liquids. The basic principle is to continuously fill a measuring chamber with a fixed volume and drive rotating components such as pistons, disks, gears, etc. to perform periodic movements during this process. Whenever the measuring chamber is filled with fluid and discharged once, it means that a certain volume of fluid has passed through the flowmeter. The specific working process is as follows: when the fluid enters the flowmeter, it will push the piston, turntable, or toothed combustion wheel and other components in the measurement chamber to rotate or displace. These rotational or displacement movements of the spinor segments will be recorded by an integrator mechanism. The main function of the accumulator is to accumulate the number of times the measuring chamber is filled and discharged with fluid. Since the volume of the measuring chamber is known, the total volumetric flow rate of the fluid can be obtained by multiplying the number of times by the volume filled in a single time. The advantage of volumetric flowmeter lies in its simple measurement principle, which is not affected by fluid physical properties such as density, viscosity, etc. Therefore, it has high measurement accuracy and stability. Meanwhile, due to the absence of physical quantities that need to be converted during the measurement process, its response speed is relatively fast. In terms of application scenarios, volumetric flow meters are widely used in various situations where gas or liquid flow needs to be measured, such as flow measurement and control in industries such as petroleum, chemical, metallurgy, 
2. Which is a good small liquid flowmeter?
3. What are the types of velocity flow meters? Explain their basic principles separately.
[Answer]: There are three types of velocity flow meters: electromagnetic flow meters, turbine flow meters, and ultrasonic flow meters. (1) Electromagnetic flowmeter is an instrument made according to Faradays law of electromagnetic induction to measure the volumetric flow rate of conductive liquids. The volumetric flow rate of the fluid flowing through the pipeline is proportional to the induced electromotive force. (2) Turbine flowmeter is based on the principle of conservation of moment of momentum. The fluid impacts the turbine blades, causing the turbine to rotate. The speed of the turbine changes with the flow rate, and the flow rate value is finally calculated from the speed of the turbine. (3) The principle of ultrasonic flowmeter is to compare the propagation of ultrasonic waves in the fluid when it is flowing with that when it is stationary. Different flow velocities will cause changes in the propagation speed of ultrasonic waves.
4. What are the measurement ranges of electromagnetic flow meters?
1、 Electromagnetic flowmeter is a very sensitive flowmeter that can measure the flow rate of conductive liquids. It is also economical and has a diameter of generally DN10-- DN2000. It can measure
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