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1. What is the unit of CMF? CMF is not a universal unit, but refers to the Coriolis Mass Flow Meter. This is a unique device for measuring fluid mass flow rate, and its working principle is very clever. The core of the Coriolis mass flowmeter lies in its design, which consists of two parallel U-shaped tubes. The bent parts of these two pipes vibrate with each other, and at the same time, when fluid is introduced into the pipe and flows forward along the pipe, it will follow the pipe to produce up and down vibrations. This design makes flow measurement direct and highly accurate, accurately capturing the mass flow information of the fluid. By observing and analyzing the influence of fluid on the vibration of U-shaped tubes, Coriolis mass flow meters can provide real-time measurement of fluid flow states and are commonly used mass flow measurement tools in contemporary industrial and scientific research fields.

2. The continuation of yesterdays problem, behind the measuring valve, we believe it is atmospheric pressure. So how to 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.

3. What is a turbine flow meter

A turbine flow meter should be a turbine flow meter, which is directly transliterated as a turbine flow meter by some people.

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