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1. 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 u
2. Sierra USA
Located in the beautiful environment of Monterey, California, USA, Sierra USA is a globally renowned enterprise founded by Dr. Olin in January 1971.
. The companys main business covers the research and development, production, and customer service of Industrial Thermal, Capillary MFM/MFC, and Vortex Mass Flow Meter. Sierra, with its profound technological heritage, gathers world-class professionals, and shapes a leading global brand image through advanced equipment, rigorous management, and excellent services. The company is headquartered in the United States and has branches in the Americas, Europe, and Asia. Its products are sold worldwide, with cumulative sales exceeding 500000 units. Sierras main product line includes thermal mass flow meters and controllers, vortex street mass flow meters, and ultrasonic flow meters. Multiple innovative technologies are unique in the industry, such as automated benchmark flow calibration systems and vortex street mass flow meters, which are the worlds first. Sierras products have won multiple national awards in the United States, especially in the field of flow measurement. Its inventions and innovations, such as thermal mass flow meters with clean sensors and low-cost micro tube thermal mass flow meters, are groundbreaking achievements in the glob
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