Brief Analysis of Flow Conversion of Metal Tube Float Flow Meter

Abstract: Analysis of flow conversion information of metal tube float flowmeter is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The metal tube rotameter is composed of the body vertebral tube and the case pointer indicator. In addition to indicating the instantaneous flow on the spot, it can also transmit a 4-20mA DC electrical signal far away. Lower limit switch, flow accumulation function, each work. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article analyzing the flow conversion of metal tube float flowmeters. The metal tube rotameter is composed of the body vertebral tube and the case pointer indicator. In addition to indicating the instantaneous flow on the spot, it can also transmit a 4-20mA DC electrical signal far away. Lower limit switch, flow accumulation function, and each functional unit board is a plug-in structure, which has the characteristics of simple and convenient replacement of parts and accurate positioning. Why do flow conversions? In the production process, when calibrating the metal tube rotameter, we use water or air to calibrate the rotameter. Because the state of the medium and the calibration time are different in actual application, according to the measurement principle, the flow value represented by the float at the same position in the measuring tube and the calibration time are different. It is necessary to know the flow conversion relationship between them. In addition, the industry standard of the float flowmeter stipulates that its accuracy is relative to the full scale, so when users use it, it is reasonable that its common flow should reach more than 60% to 80% of the full scale. If it is used below 50%, the relative error will be If the flow rate is increased, the accuracy will be affected. If the flow rate exceeds the full scale, it will not be able to measure normally. Therefore, only the correct flow conversion can be used to select a suitable instrument. There are two main basis for conversion of metal tube rotameter: the theoretical calculation formula of rotameter and the state equation of ideal gas. (1) is the theoretical calculation formula of the float flowmeter, (2) is the state equation of the ideal gas. Calculation formula of float flowmeter (1) In the formula: Q——Volume flow a——Flow coefficient Fk——The annulus area g between the maximum diameter of the float and the cross section of the tapered tube of the same height——Gravitational acceleration Vf——volume of floatρf——density of floatρ——Density A of the fluid being measured——The maximum cross-sectional area of ​​the float (the unit in the formula is cm, g, s) The state equation of the ideal gas (2) In the formula: P0, P1——Absolute pressure in both states T0, T1——Absolute temperature in both states V0, V1——The volume in the two states can be deduced from the equation of state of the ideal gas to the following two relationships: a flow relationship (3) B density relationship (4) where: M——the quality of the mediumρ——The density of the medium Q——The flow of the medium is also stipulated by the industry standard of the float flowmeter: its accuracy is relative to the full scale, so when the user is using it, it is more reasonable for the commonly used flow to reach more than 60% to 80% of the full scale. If it is used below 50% of the full scale, the relative error will increase, and the accuracy will also be affected. If the flow rate exceeds the full scale, it will not be able to measure normally. Therefore, only the correct flow conversion can select a suitable instrument. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of flow conversion of metal tube float flow meter'

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