Problems with vortex flowmeters
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Our company uses vortex flow meters from Shanghai Kent to measure the flow rate of air compressors. When the compressor is running, the intelligent digital display shows a value between 500–700 M3/H, as indicated by the signals sent from the vortex flow meter. However, when the compressor is turned off, the display shows 732 M3/H. Why is this? ? Is it the intelligent digital display instrument that’s broken, or is it the vortex flow meter that’s damaged?
When using vortex flowmeters, attention must be paid to shear at low flow rates; that is, when the flow rate is below the minimum value specified in the calculations, the flowmeter can no longer ensure accuracy.
Personally, if it’s a product issue rather than a technical one, it’s best to ask the manufacturer, as they know their own products best; however, everyone can discuss it once it’s posted.
It’s likely that there is a problem with the electronic part of the vortex flowmeter. If it were caused by vibration or issues related to low flow rates, such large errors would not occur. It is recommended to have the manufacturer come and take a look; signal interference or poor grounding could be the cause
I believe that the indication value when stopping the air compressor refers to the moment the compressor just stops, or it refers to a few hours after the compressor has come to a complete stop. If it refers to the situation right after the compressor stops, when the air inside the compressor and pipes has not yet been completely expelled and there is still air acting on the vortex street, then there is a reading, but it is not accurate ； If there is still a reading several hours after the compressor has come to a complete stop, then there is a problem with the vortex flow meter, or the input connection for the digital display is not properly grounded, allowing signals to interfere and cause the digital display to show a reading.
It’s probably a interference issue; we need to figure out what type of interference it is. You can turn on and off the nearby electrical devices separately to observe.
First, determine whether it is a problem with the vortex flow meter or the display instrument; disconnect the input to the display instrument and check if there is any indication. If there are indications that the vortex flow meter is generating a signal, then check the vortex flow meter for issues such as vibration, interference, or other problems.