The measurement of gas flow by vortex flowmeter is the main field of its application

There are many types of gases, including gases used as energy sources, such as natural gas, coal gas, hydrogen and compressed air; there are also industrial raw materials such as oxygen, nitrogen, carbon dioxide, hydrogen sulfide, methane, chlorine, etc.; The waste gas produced after the reaction is discharged into the atmosphere. Whether it is energy gas, raw gas, or exhaust gas, flow measurement or detection is required during the transportation process. There are many instruments used for gas flow measurement. Among all kinds of flowmeter instruments, except for electromagnetic flowmeter, almost all other types can measure gas flow. At present, there are many applications such as differential pressure type, fluid vibration type, and turbine flowmeter. type, ultrasonic flowmeter. Measuring gas flow with vortex flowmeter is the main field of its application. Compressed air as an energy-carrying medium can be regarded as a secondary energy source. When the working pressure is required to be low, it can be generated by a fan. When higher working pressure is required, it will be generated by air compressor. In production, measuring the air volume of fans and the flow rate of compressed air is an important means of energy management for various enterprises. As the fluid to be measured, air is a relatively clean and non-corrosive medium. Although the air contains moisture and acid gases, it can be used for vortex flowmeters that use stainless steel as the liquid contact material. will affect. To measure the compressed air flow, there are several issues worth noting: (1) Vibration influence. Compressed air is produced by an air compressor or a high-pressure fan. These devices all have different degrees of vibration during operation, and sometimes the vibration is relatively strong, and this vibration will be transmitted through the connecting pipeline. This influencing factor should be fully considered when selecting the type of vortex flowmeter and determining the installation location. In various detection methods, due to the different detection components, the anti-vibration performance of the instrument is also different. The vibration resistance of the vortex flowmeter that adopts the principle of detecting speed changes is better. For example, the vibration resistance of the ultrasonic and heat-sensitive vortex flowmeters can reach 2g; the vortex flowmeter that uses the force detection method is more sensitive to vibration. In recent years, with the progress in the design of force detection components and signal processing technology, the anti-vibration performance has been significantly improved, which can reach 0.5g to 1g. When selecting a vortex flowmeter, for pressurized gas, such as compressed air, due to the increase in density, the lower limit flow rate can be reduced accordingly. Each manufacturer gives the curve or empirical formula of density and minimum flow rate in the selection sample or instruction manual. (3) Effect of pulsating flow Most of the gas output by fans and compressors contains pulsating components. The pulsation frequency and amplitude of the gas output by the Roots blower are related to the rotation speed of the waist wheel and the fixed displacement volume, usually the pulsation frequency is 100-200Hz; while the frequency of the gas output by the reciprocating compressor is lower, generally only a few hertz. In addition, some gas-consuming equipment, such as air hammers and pneumatic tools, will also cause airflow pulsation, and the frequency and amplitude of this pulsation are random. As mentioned above, the pulsating flow has a significant impact on the stability of the Karman vortex street. In severe cases, the vortex frequency may be 'locked'. This 'lock-up' phenomenon has occurred in the gas test device, which is the device used to adjust the split rotor flow meter. A DN50 stress-type vortex flowmeter is installed on the pipeline, a Roots blower is used as the gas source upstream, and a DN50 gas turbine is installed farther downstream (about 10m) for flow monitoring, and the flow rate is controlled by the downstream valve. In the test, the following phenomenon appeared: when the downstream valve was adjusted to a certain opening degree, the frequency of the output signal of the vortex flowmeter no longer increased with the increase of the flow rate, and remained unchanged at about 200Hz. At this time, adjusting the gain and trigger sensitivity of the preamplifier of the vortex flowmeter is invalid. At first thought it was 50Hz or octave interference, but neither reinforced shielding nor grounding helped. I also thought it was power supply l00Hz or multiplier interference, and measured the ripple of the DC power supply. The ripple was very small, and replacing the DC power supply would not help. Phenomenon, the frequency meter indication changes greatly. In order to find out the reason and clarify the problem, the installation positions of the vortex flowmeter and the turbine flowmeter were reversed. As a result, the frequency of the output signal of the upstream turbine flowmeter has a large jump. Observing the waveform with an oscilloscope, it can be seen that the waveform jitters seriously and the pulse width is uneven; looking at the downstream vortex flowmeter, the output waveform is no longer like It is so 'stable' as seen before, and the frequency displayed by the frequency meter jumps between 195 and 220Hz, indicating that the vortex flowmeter is no longer locked on the original frequency.

If you have a need for v shape coriolis mass flow meter mass flow meter, like , and , you need to be able to find a dependable provider who you can trust when necessary.

To learn more about mass flow meter， give us a call at Beijing Sincerity Automatic Equipment Co., Ltd or visit us online by going to Sincerity Mass Flow Meter Manufacturers.

This is especially true when Beijing Sincerity Automatic Equipment Co., Ltd have got a global business that's building bridges between manufacturers and customers across the globe.

Forging an tight connection starts with understanding your potential customers and catering to their needs on mass flow meter, both with a quality product and impactful u shape coriolis mass flow meter.

Beijing Sincerity Automatic Equipment Co., Ltd knew the only way to remain competitive was to ensure quality of service and customer satisfaction above all.