Aister Meters share the considerations of vortex flowmeters for measuring compressed air
2021-06-05
Compared with other flowmeters, vortex flowmeter has no moving parts inside, simple structure and long service life. But as a compressed air flowmeter also need to pay attention to some problems.
1. The minimum traffic is faulty
The amplitude of the vortex flowmeter signal is proportional to the square and density of the velocity of the measured medium. That is to say, when the detection sensitivity of the vortex flowmeter is certain, the working pressure of the fluid is increased, the density is increased, and the measured flow rate can be reduced. Conversely, at a certain flow rate, if the working pressure of the fluid is increased, the density is increased, the amplitude of the vortex signal is also increased, and the detection sensitivity can be reduced. For atmospheric gas, the lower limit flow rate of vortex flowmeter can reach 4~5m/s. For pressurized gases, such as compressed air, the lower limit flow rate will be reduced due to the increase in density. Therefore, in the selection, we should consider the actual working condition flow.
2. Vibration effect
Compressed air is generated by air compressor or high pressure fan. When these devices are in operation, they all have varying degrees of vibration, and sometimes the vibration is relatively strong, and this vibration is transmitted through the connecting pipe. When selecting and determining the position of the vortex flowmeter, this influencing factor should be fully considered. In various detection methods, the anti-vibration performance of the instrument is not the same due to different detection components. For the vortex street of the detection element, the vibration resistance can reach 0.5~1G. When determining the installation position of the vortex flowmeter, it should be as far away from the power equipment such as air compressors and fans as possible.
3. Pulsating flow effect
Because the gas output by the fan and compressor, most of it contains a certain component of the pulsation. The pulsation frequency and amplitude of the gas output by Roots fan are related to the speed of the waist wheel and the constant displacement volume, and the pulsation frequency is usually 100~200HZ; The reciprocating compressor output gas frequency is low, generally only a few Hertz. In addition, some gas equipment, if the air hammer, pneumatic tools, etc., will also cause air pulsation, and the frequency and amplitude of this pulsation are random.
Therefore, the development and application of vortex flowmeter are actively studied at home and abroad, which has broad prospects for development.
Share To：
News
- Why is the thermal gas mass flowmeter not affected by pressure strength and temperature?
- What to do when a thermal gas mass flow meter fails?
- How are thermal gas mass flow meters used? What are the applications?
- Under what circumstances is the gas measurement need to be regulated compensated vortex flowmeter
- Why Is The Aister Thermal Gas Mass Flowmeter So Popular ?
- Gas turbine flowmeter manufacturers explain their main advantages in measurement
- Gas turbine flowmeter manufacturer Aister instrument field experience summary
- Aister Instrument Empowerment Conference
