In the selection of vortex flowmeters and key points for installation

1 in the selection of vortex flowmeters. The selection of vortex flow meter diameter instrument manufacturer is different, the selection methods of will be different. Should be according to its corresponding selection methods, a detailed calculation, to determine the size of the aperture. Rather than blindly choose according to pipe diameter meter diameter, selection should pay attention to: limitations: Reynolds number when Reynolds number Re< 5× 10 3 to the power, basic cannot measure the vortex flowmeter, when the Reynolds number Re< 2× 10 4 power, due to the nonlinear S on the high side, so lead to big deviation measurement; Velocity restrictions: for measuring the liquid flow, ZUI large 10 m/s speed and measuring gas flow rate, ZUI big velocity of 75 m/s. In order to make the flow velocity, vortex street flowmeter work within the scope of the accuracy of measurement assurance, try to choose smaller than nominal diameter of the flowmeter. If the meter diameter is larger, the in flow of low limit to run, the measurement values are not accurate. 2. Sensor detecting element selection of material in chemical industry, many medium containing corrosive, therefore should choose according to the corresponding medium when selection of the corresponding sensor material. Otherwise sensors or vortex occurred after corrosion, light person can affect the measurement, the person that weigh meter to measure, even medium leakage accidents. 3. Viscosity larger or easy to precipitation of fluid when the measurement of viscosity is larger or easy to precipitate the fluid flow, the vortex street place of body surface adhesion or sediment will make changes in body shape and size, impact coefficient of the instrument; And sensor surface adhesion or sediment, the sensitivity of instrument can reduce this suggest use the principle of the flowmeter, or often clean and vortex flowmeter sensor body. The installation of vortex street flowmeter points ( 1) Choose reasonable installation site. Such as to avoid the strong power equipment, high-frequency equipment, strong power switch device; To avoid the high temperature heat source and the influence of radiation heat source; Avoid strong vibration. ( 2) Upstream and downstream straight pipe meet the requirements. Flow resistance of different flow field is different, the influence of the sudden contraction at the sudden enlargement and section can form secondary flow in the shoulder, in the bent pipe position sudden change in the flow direction of the lateral bending tube will form secondary flow, the abrupt change in circulation area of flow valve position will also be affected. Therefore different choke a requirement for straight pipe is different also, such as flow meter before a bend, straight pipe in front of 20 times the pipe diameter, the back of the straight pipe required 5 times the pipe diameter. But in front of flowmeter has two elbow, straight pipe in front of 40 times the pipe diameter, the back of the straight pipe required 5 times the pipe diameter. ( 3) Vibration of the pipeline, header level installation, vortex flowmeter for piping vibration strong, set up damping device. ( 4) If possible to install by-pass pipe, easy to maintenance. ( 5) Measuring fluid containing a small amount of interphase, pay attention to the sensor installation location. Such as measurement and solid medium, the flow meter should be installed in the place where is not easy to precipitate; And measured medium is gas, which contains the liquid, the discharge valve should be installed at before flowmeter, otherwise it will produce air hammer, damage to the sensor ( 6) Medium at high temperature, flow meter meter installed down, or choose split type flowmeter ( 7) Vortex flowmeter signal transmission wire and metal shielding wire should be adopted, to have good grounding measures. Follow the principle of one-point earthing. ( 8) Pipe heat insulation. General measuring, steam pipe heat insulation is one of the important measure to prevent energy is lost, when insulating of vortex street flowmeter, shall ensure that vortex street flowmeter sensor and circuit part exposed, to ensure that the heat radiated outward to prevent overheating instrument of electronic components. ( 9) To prevent cavitation occurs, vortex street flowmeter inlet pressure to meet the requirements: P = 2. 74△P+1. 3 P - v△P - The pressure loss of vortex flowmeter; Pv- Use * saturated vapor pressure of liquid temperature.

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