Vortex flowmeter is suitable for the measurement of superheated steam and saturated steam, compressed air gas, water and the volume and mass flow rate of liquid flow, UH - LUGB vortex flowmeter is manufactured by Shanghai persistence development of a remote transmission type, temperature, pressure compensation type, site type display more scenarios using vortex flowmeter, which can be widely used in petroleum, metallurgy, environmental protection, food, textile, electric power, chemical industry and other industries, it has wide measurement range/small pressure loss, high precision, high reliability and long-term stability, meter new process design has simple structure, no moving parts/no mechanical wear and tear, easy installation and maintenance, and has good high temperature resistance and corrosion resistance,
The working principle of vortex flowmeter is how? Insert an object in the fluid, the fluid flow is affected, on both sides of the obstacles will alternately separation release two series of vortices, the two form parallel to each other in the downstream vortex flow, known as the karman vortex street, obstacles is spiral body, it will be three prism, or cylinder, the cyclotron direction of spiral vortex flowmeter, because in the vortex flow of different and different, in the above column for clockwise vortex flow, in a column at the bottom of the counterclockwise, due to the interaction between vortices, the vortex flow is not stable, but the theory and experiments show that when meet the parameter h/l=0.281 (h for karman vortex street column spacing, l for columns with spiral intervals), the vortex street is stable, and unilateral vortex separation release frequency f and v, fluid flow vortex occurrence body width d (triangular prism for the bottom width, cylinder diameter) relationship of type: f=St * v/d
Type: St - strouhal coefficient
St is a function of Reynolds number Re, when Re=500 ~ 150000, St=0.16 (for three prism) and St=0.2 (the cylinder), detection of flow velocity in the industry, in fact almost all don't beyond this range,
By visible on the type, the separation of vortex frequency f only depends on the medium velocity and vortex occurred width ratio of the body, and is not affected by temperature, density and viscosity influence, therefore, to test the f, can get the medium velocity v, and thus get the volume flow in the medium, the working principle of vortex flowmeter are introduced above is,
UH - LUGB main technical parameters of vortex street flowmeter
Measuring medium: liquid, general gas, steam
Nominal diameter: DN15 ~ 12 (tube), 6 ~ DN2000 (plug),> DN2000 supply agreement
Medium temperature: - 40 ~ 100 degrees Celsius (room temperature), and 40 ~ 250 degrees Celsius (temperature), and 40 ~ 320 degrees c (high temperature), and 40 ~ 350 degrees Celsius (ultra high temperature)
Nominal pressure: 1.6 MPa, 2.5 MPa, 4.0 MPa (& gt; 4.0 supply agreement)
Accuracy: +/- 1% R, plus or minus 1.5% R (full tube); Plus or minus 1.5% R, plus or minus 2.5% R (plug-in)
Power supply: + 12 VDC (three-wire system pulse output), + 24 VDC (three-wire system pulse output type and two wire current output type), 3.6 V lithium battery, dual power supply,
Body material: 304 (other material supply agreement)
Protection grade: IP65 (other protection grade supply agreement)
Environmental conditions: temperature - 20 degrees Celsius ~ 55 degrees, relative humidity of 5 degrees Celsius to 90 degrees Celsius, atmospheric pressure 86 ~ 106 kpa,
Finally, said the use of vortex street flowmeter note
1: normal work, the vortex flowmeter has certain requirement for flow rate lower limit, so when selecting flowmeter size can't choose according to the pipe size, and to consider the fluid viscosity and density, according to the small flow rate, large flow, traffic and other commonly used for sizing of flowmeter, and to make common flow in can be more than 20% of the measurement range,
2: vortex street flowmeter factory factory has according to the order parameters of flow meter, users need to modify, but if the order shipped header vortex flowmeter, a user can according to the working condition of field or changing pipeline conditions of some parameters to set more accurate, more accurate measurement results is obtained, secondly, the user can directly read the instantaneous flow and cumulative flow from the header at the scene,
3: the user in the main parameters are: set the meter display mode, type of fluid (gas, liquid and steam), flow unit, the working pressure, working temperature, working condition of density, standard pressure, the standard state temperature, etc., for some other system parameters, unless there is a deep understanding of accurately, generally can't tinkering,