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『Nitrogen flow meter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Measurement range of nitrogen flowmeter
Corrosion resistant DN (mm) ordinary DN (mm) flow range Maximum pressure loss Air m/h 20 ℃ 0.101325 MPa Water L/h 20 ℃ Air (kPa) Water (kPa) 15 15 0.07~0.7 2.5~25 7.1 6.5 0.11~1.1 4.0~40 7.2 6.5 0.18~ Shortage 1.8 6.0~60 7.3 6.6 0.28~2.8 10~100 7.5 6.6 0.40~4.0 16~160 8.0 6.8 0.70~7.0 25~250 10.8 7.2~10 40~400 10 8.6 25 1.60~16 60~600 14 11.1 25 3.00~30 100~1000 7.7 7 4.50~45 160~1600 8.8 8 7.00~70 250~2500 12 10.8 50 11~110 400~4000 19 15.8 50 18~180 600~Zhiwang Bian 6000 8.6 8.1 25~250 1000~10000 10.4 11 80 40~400 1600~16000 15.6 17 80 75~750 2500~25000 8.1 100 100~1000 4000~40000 9.5 100~1500 6000~60000 10 150 125 8000~80000 100000~1000000 Ling Xing 150 15000~150000
2. Introduction to Nitrogen Flow Meter
The nitrogen flowmeter is manufactured using the Karman vortex street principle, which has the advantages of high measurement accuracy, wide range, low power consumption, easy installation, simple operation, and low pressure loss. It can measure volumetric flow rate or standard volumetric flow rate under working conditions (integrated intelligent temperature and pressure compensation). According to user needs, it can be equipped with pulse or 4-20mADC electric pin side flow output function. It is currently an ideal nitrogen metering instrument.
3. Working principle of nitrogen flowmeter
Introduction to the working principle of nitrogen flowmeter: When a triangular cylindrical vortex generator is set up in the fluid, regular vortices are alternately generated from both sides of the vortex generator. This type of vortex is called Karman vortex, as shown in the figure on the right. The vortex columns are asymmetrically arranged downstream
(1), where U1 represents the average flow velocity on both sides of the vortex generator, m/s； Sr Strouhal number; The ratio of the bow shaped area on both sides of the m - vortex generator to the cross-sectional area of the pipeline is qv, which is qv=π D2U/4=π D2mdf/4Sr (2) K=f/qv=[π D2md/4Sr] -1 (3). In equation K - the instrument coefficient of the flowmeter is the number of pulses/m3 (P/m3). K is not only related to the geometric dimensions of the vortex generator and pipeline, but also to the Strouhal number. The Strouhal number is a dimensionless parameter that is related to the shape of the vortex generator and the Reynolds number. Figure 2 shows the relationship between the Strouhal number of a cylindrical vortex generator and the Reynolds number of a pipeline. As shown in the figure, Sr can be regarded as a constant within the range of ReD=2 × 104 to 7 × 106, which is the normal operating range of the instrument. When measuring gas flow rate, the flow calculation formula for VSF is (4), where qVn and qV - are the volumetric flow rates under standard conditions (0oC or 20oC, 101.325kPa) and operating conditions, respectively, m3/h； Pn, P - are the absolute pressures under standard and operating conditions, Pa; Tn, T - are the thermodynamic temperatures under standard and operating conditions, K; Zn, Z - are the gas compression coefficients under standard and operating conditions, respectively. As can be seen from the abo