What are the types of displacement flow meters for micro gear flow meters

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1. Comparative analysis of several typical automatic measurement schemes

Weighing measurement method (for liquids) Weighing measurement method collects signals through pressure sensors, and displays the mass after circuit conversion. Adopting a weighing based measurement method does not require significant requirements for the physical and chemical properties of the liquid, but it requires significant modifications to the equipment and site on site. The range of measurement determines the size of the error, and it is necessary to preset the impulse value. The measurement method of mass flowmeter (for liquids) is based on the Coriolis mass flowmeter as the core equipment, which has high measurement accuracy and is inconvenient to maintain. Its biggest feature is its high price. The measurement method for volumetric temperature compensation and pressure balance (for liquids) is based on a rotor flowmeter as the core equipment. The volume of liquid exported by each rotation of the rotor is the same, so that the volume can be converted into rotation, and then the rotation can be converted into digital pulse quantity through small teeth (transmitter) and signal collector for cumulative counting to achieve the measurement process. The basis of this method is that the volume of each revolution of the rotor must be the same, which means good repeatability. At present, the rotor flowmeter with good repeatability in the domestic market is the elliptical gear flowmeter, with a repeatability of less than 0.09% and a self measurement accuracy between 0.5-1%. The high-quality elliptical gear flowmeter has a repeatability of less than 0.07% and a self measurement accuracy of less than 0.5%. The elliptical gear flowmeter is s

uitable for measuring liquids with certain viscosity and uniform composition. The compensation mechanism is crucial in the measurement method of volume temperature compensation and pressure balance, and the scientific mathematical model of the compensation mechanism directly affects the accuracy of converting volume into mass. In this regard, the vast majority of manufacturers directly adopt the mathematical model of the former Soviet Union in the 1950s, which calculates results with non-uniform physical dimensions and can only be borrowed. Through practical testing, this mathematical model has been proven to be accurate in measuring a fixed measurement value in practical applications, but has significant measurement errors for discrete measurement values. The mathematical model independently verified by Weifang Dargo has a unified physical dimension for its calculation results, and has high accuracy in measuring a fixed measurement value. It also has very small measurement errors for discrete measurement values. The basic measurement principle of the elliptical gear flowmeter system is to convert the volume signal into a pulse signal, accurately compensate for the measured temperature in each pulse signal, and form a small weight. The small weight continuously accumulates to form the final measured weight value. This method, like the mass flow meter method, belongs to the flow measurement method. Measurement can be completed simultaneously with liquid delivery, without taking up additional time, which will greatly shorten the process. The existing production facilities require minimal modifications and are easy to renovate. Only pressure balancing devices, temperature sensors, elliptical gear flow meters, and pipeline c

What are the types of displacement flow meters for micro gear flow meters

1. Comparative analysis of several typical automatic measurement schemes

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