Compressed air mass flow meter

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What is the principle of a compressed air flow meter? How to choose? Compressed air flow meter is a velocity type instrument used to measure the flow rate of gas medium in closed pipelines. It is widely used in various fields such as metallurgy, petroleum, chemical industry, energy, food, environmental protection, etc. Compressed air flow meters can display real-time temperature, real-time pressure, instantaneous flow rate, and flow accumulation. They are generally suitable for measuring various non corrosive gases, such as natural gas, air, etc. Some flow meters can also measure corrosive gases. Taiwans DPC explains the working principle of compressed air flow meters. The basic principle of compressed air flow meters is the Karman vortex street principle, which states that "the frequency of vortex separation in the vortex street is proportional to the flow velocity". The diameter of the transmitters flow body is basically the same as the nominal diameter of the instrument. There is an approximately isosceles triangular cylinder inserted into the flow body, with its axis perpendicular to the direction of the measured medium flow and its bottom facing the fluid flow. When the compressed air under test flows through the cylinder, vortices are alternately generated on both sides of the cylinder, and the vortices are continuously generated and separated. Two rows of staggered vortices, known as "vortex streets," are formed downstream of the cylinder. Theoretical analysis and experiments have shown that the frequency of vortex separation is directly proportional to the flow velocity of the column side medium. Vortex interlocking separation generates pulsating pressure in the wake on both sides and behind the cylinder. The detection probe located inside (or behind) the cylinder is subjected to this tiny pulsating pressure, causing the piezoelectric crystal elements embedded in the probe to experience alternating stress and generate alternating charge signals. After undergoing charge transformation, amplification, filtering, limiting, and triggering shaping on the amplifier, the signal outputs a square wave voltage pulse signal with the same frequency as the vortex separation frequency. The signal is then sent to the local display device, and each pulse output by the sensor will represent a certain volume of the measured fluid. The total number of output pulses over a period of time will represent the total volume of fluid flowing through the sensor during that time. The voltage pulse signal output by the compressed air flow meter sensor is sent to an integrated local display device. The compressed air flow meter local display device uses the latest low-power CPU to measure the frequency signal output by the vortex sensor, and performs flow calculation based on the set density and vortex flow coefficient. The on-site LCD displays the instantaneous flow rate and cumulative flow rate. The selection method of compressed air flowmeter: The diameter and specifications of the compressed air flowmeter should follow the following principles:

1. Clearly define the name and composition of the fluid.

2、 Clearly define the maximum, common, and minimum flow rates for work status.

3、 Clearly define the highest, commonly used, and lowest working pressures and temperatures.

4、 The viscosity of the medium under the working state of Huaiye.

5、 Calculate and select the instrument flow range and caliber size based on the diff

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