How to express an air flow meter in English

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1. What does "front ten, back five" mean for a flow meter?

The meaning of "front ten, back five" for a flow meter rental is: the installation requirement for a fire flow meter is to have a distance of 10D (10 times the diameter of the pipes inner limb) and 5D (5 times the distance between the pipes inner diameter and the straight section) in front of it. When measuring with a general flow meter, it is required that the fluid be in a turbulent state. Previously, when there was a pump or bend pipe, the state of the fluid may be changed (laminar or transitional state), which will affect the measurement of the flow meter. Therefore, there is a requirement for the front and rear straight pipe sections. The English name of a flowmeter is flowmeter, which is defined by the National Science and Technology Terminology Review Committee as an instrument that indicates the measured flow rate and/or the total amount of fluid within a selected time interval. Simply put, it is an instrument used to measure fluid flow in pipelines or open channels. Flow meters are divided into differential pressure flow meters, rotor flow meters, throttling flow meters, narrow gap flow meters, volumetric flow meters, electromagnetic voltage flow meters, ultrasonic flow meters, etc. Classified by medium: liquid flowmeter and gas flowmeter.

2. Information about flow meters? The advantages of electromagnetic flowmeter are minimal pressure loss and a wide range of measurable flow rates. The ratio of maximum flow rate to minimum flow rate is generally above 20:1, suitable for a wide range of industrial pipe diameters, up to 3m. The output signal is linear with the measured flow rate, with high accuracy. It can measure the fluid flow rate of acid, alkali, salt solutions, water, sewage, corrosive liquids, as well as mud, slurry, pulp, etc. with conductivity ≥ 5 μ s/cm. But it cannot measure the flow of gas, steam, and purified water. When a conductor cuts magnetic field lines in a magnetic field, an induced electric potential is generated in the conductor, and the magnitude of the induced electric potential is proportional to the effective length of the conductor in the magnetic field and the speed at which the conductor moves perpendicular to the direction of the magnetic field. Similarly, when a conductive fluid flows vertically in a magnetic field and cuts magnetic induction lines, it will also generate induced potentials on the electrodes on both sides of the pipeline. The direction of induced potential is determined by the right-hand rule, and the magnitude of induced potential is determined by the following equation: Ex=BDv -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- It can be seen that when the diameter D of the pipeline is fixed and the magnetic induction intensity B remains constant, the measured volume flow rate is linearly related to the induced potential. If an electrode is inserted on each side of the pipeline, an induced potential Ex can be introduced, and the magnitude of this poten

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