Rotameter flow meter | Continuation of yesterdays question, behind the metering valve we believe it is atmospheric pressure, so how to measure this ..|venturi meter

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1. May I ask how to translate "vortex flowmeter" in English?

Vortex flowmeter: Vortex Flowmeter. Translation of other flowmeters for reference: Electromagnetic flowmeter: Electromagnetic flowmeter. Coriolis mass flowmeter. Open channel flowmeter: Orifice Plate flowmeter. Rotary flowmeter: Rotameter. Turbine flowmeter: Turbine flowmeter. Thermal flowmeter: Calorimetric flowmeter. Volume flowmeter: Positive Displacement (PD) flowmeter. Ultrasonic flowmeter: Ultrasonic flowmeter. Venturi flowmeter: Venturi flowmeter. Thermal mass flowmeter: Thermal Mass flowmeter. Multiphase flowmeter: Flumes and Weirs flowmeter for water tanks and weirs

2 The continuation of yesterdays question, behind the measuring valve, we believe it is atmospheric pressure. So, how can we measure this The word measurement can be understood as calibrating flow rate or daily measurement. There are multiple options based on the approximate range of gas flow rate and accuracy requirements: 1. Small flow rates below 1 L/min can be measured/calibrated using the most basic but accurate soap bubble flowmeter. It is particularly suitable for situations where the back pressure is zero. 2. There are different types of rotameters available for flow rates ranging from 0.01 to 100 L/min, and the accuracy is still acceptable. 3. Mass Flow Meter (MFM) is available for flow rates ranging from 0.01 to 1000 L/min, with high accuracy. 4. The flow rate ranges from 1-100 Nm3/h and can be measured using a critical Venturi nozzle (which is also one of the standard methods for measuring gas flow), with high accuracy. Standard English documents can be found online. 5. Larger industrial flow rates are measured using orifice pressure differential flow meters, vortex street flow meters, etc., with acceptable accuracy. Of course, the above traffic ranges are roughly divided. Based on the "steel cylinder" you mentioned earlier, I understand that you want to calibrate the flow curve of the measuring valve at different scales. I estimate that the flow rate should not exceed 200 L/min (at this flow rate, a 51 liter nitrogen cylinder can be emptied in 1 hour). A mass flow meter can be used to calibrate the measuring valve, and then the mass flow rate can be converted to a standard volumetric flow rate based on the gas composition and approximate molecular weight, according to the ideal gas equation. The advantage of using MFM calibration is that there is no need to worry about only changes in port pressure. It measures the molecular flow rate and has an automatic compensation function for pressure. Usually, metering valves have their own calibration curves, so sometimes you only need to calibrate a few points (such as 10, 50, 100% range) for flow verification. I dont know if my understanding of your question is correct.

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