One: Overview KH-LUGB Series Intelligent Vortex Flowmeter is a new flow meter, which uses a new generation of dual-vortex flow sensor body, compared to similar products at home and abroad with a wide measuring range, its low flow measurement, Many new features of high accuracy. Has many advantages other flow meters can not have both, which is inserted into the body fluid produced and the flow rate is proportional to the number of vortices formed. Then change then vortex stressful as stress changes were detected, the output proportional to flow 4 ~ 20mA current pulse or DC current to the flow totalizer or computer systems. Second: The main features of the full range, wide measurement range, high accuracy detection sensor is not in contact with the media. High reliability for a wide range of gas and liquid generic no moving parts, solid construction and long service life simple inexpensive small pressure loss are measured at cost. The detection sensor interchangeable, after changing without calibration, easy to maintain, plug-flow meter can be carried out continuously demolition corrosion, safe, explosion. Header features: 1. Chinese character dot matrix LCD display, easy and intuitive, concise operation; 2. HART protocol with full functionality, including special orders; 3. With temperature / pressure sensor interface. Temperature can be connected with Pt100 or Pt1000, pressure can be accessed gauge or absolute pressure sensor, and segmentation correction; 4. Diversification of the output signal, you can select two-wire 4-20mA output, three-wire and three-wire pulse output equivalent output according to customer requirements; 5. Has excellent non-linear correction function, greatly improving the instrument's linear; 6. Has a spectrum analysis software, improved immunity and the ability to seismic instrumentation; 7. Universality, with sensors vortex, vortex precession frequency signals, such as supporting the use of the output; 8. Measuring a wide range of media, measurable vapor, liquid, general gas, natural gas, natural gas measurement super compressibility factor correction; 9. There are both Chinese and English versions, for users to choose; 10. Ultra-low power, a battery can maintain full performance of work for at least three years; 11. Operating mode can automatically switch, battery-powered, two-wire, three-wire system; 12. Self-test function, there is a wealth of self-test information; user-friendly maintenance and debugging. 13. Independent password settings, parameters, the total clearing and calibration can be set to different levels of passwords, user management; 14. Display units to choose from, you can customize; 15. Integration with temperature and pressure compensation intelligent vortex flowmeter three characters screen: Key Specifications Measuring media: liquid, gas or steam measurement diameter: 10 ~ 2500mm Measuring range: 0.35 to liquid 9m / s gas or vapor 4 ~ 70m / s (0 ℃, 1 atm) Accuracy: ± 1% of indication value indicating the value of ± 2.5% (male) (Ray Number 2 × 104 ~ 7 × 106) output Signal: Pulse output: 4 ~ 20mA current pulse width 0.5ms or 0.25ms wire or three-wire analog output voltage pulse: 4 ~ 20mADC hart wire output, RS485. Power supply voltage: 12-45V or 3.6v lithium battery [load resistance = 50 (supply voltage -12) Fluid temperature: -40 ~ 300 ℃ fluid pressure: -0.1MPa ~ flange rating Ambient temperature: -40 ~ 80 ℃ -20 ~ 60 ℃ (with live instruction sheet) Humidity: 5 ~ 100% RH wiring connector hole: M20 × 1.5 female main material: ordinary type: shedder and subject to 1Cr18Ni9Ti; anticorrosive type: both liner and shedder PTFE; shell 1Cr18Ni9Ti; meter box: do not take the meter for 1Cr18Ni9Ti; cast aluminum with a header. Weight: See Dimensions. Four: meter diameter select a gauge pressure losses) meter diameter choose meter pass through the maximum use flow Qv according to choice. In order to obtain the widest possible range of flow measurement, flow should not be less than the normal use of the rated maximum flow meter 1/2. To ensure the accuracy of the meter, the Reynolds number range should be within 2 × 104 ~ 7 × 106. When selecting meter diameter, should be known to the standard state (1 atm, 0 ℃) traffic flow under conversion conditions state is to (1.2) in the choice of appropriate flowmeter from the table. 1. The conversion density ρN standard state conditions into the density ρ. 2. The calculated flow conditions Qv: a) obtained by standard state volume flow Qv: a) the volume flow rate calculated by the standard state Qv: 3) Convert dynamic viscosity and kinematic viscosity η: η = μρ 4) Renault Number: The above formula: ρ- conditions Density (kg / m3) density ρN- standard state (kg / m3) P- conditions Pressure (MPa) T- conditions Temperature (℃) Qv- actual volume flow rate (m3 / h) QN- standard state volume flow (Nm3 / h) Qm- mass flow rate (kg / h) η- dynamic viscosity (Pa? S) RD- Reynolds D- meter diameter or diameter of the probe is inserted (mm) table under a different path flowmeter for liquids, gases and the maximum flow rate corresponding to the maximum frequency Note: 1. The minimum liquid flow can be found in Figure 1, the gas and superheated steam can be found in Figure 2. 2, insertion type flowmeter, the diameter from 200 ~ 2500mm its maximum flow may flow (liquid 9m / s, gas 75m / s) calculated. The minimum flow rate through Table 1, Table 2, Figure 1, Figure 2, DN50 to calculate the minimum flow, then the flow rate obtained under a certain minimum diameter. 2) the pressure loss in water flow velocity 7m / s when 0.054Mpa, air at atmospheric pressure at a flow rate of 75m / s for 830H2O, the pressure loss is calculated by the following equation. △ Ρ = 1.1 × 10-6 × ρ V2 Where:? △ Ρ-- pressure loss (Mpa) ρ-- fluid density (kg / m3) V-- velocity (m / s) commonly used in Table 2 Standard gaseous medium Examples of the saturated vapor density of states try to determine the flow meter for DN50 7bar saturated steam range. Table 3 which is available on: DN50 7bar scale range is 84-1835kg / h can also get the following information: the saturated steam temperature 165 ℃, density 3.67kg / m3 gas / minimum flow rate of superheated steam Example 2: Known nitrogen flow was 4600Nm3 / h, working pressure 0.7Mpa, working temperature is 40 ℃, choose meter pass through. Solution: 1) the standard flow conditions into the flow density at operating conditions demand first look-up table 2, that the standard state nitrogen density 1.25kg / Nm3 3) by Table 1 and Figure 2 shows the measurement range of 40 meter φ80 ~ 1375m3 / h φ100 meter measuring range 70 ~ 2120m3 / h φ80 meter measuring range 200 ~ 4771m3 / h flow rate based on the principle of selection used not less than 1/2 of the rated maximum flow. So should choose φ80 meter. When choosing a meter diameter than the diameter of the actual work hours should be used to ensure accurate measurement reducers. Rules velocity meter inlet and outlet piping conditions in order to ensure optimum operating results, the meter inlet: straight sections shown in Figure 3. Figure 3 adjustable tube five requirements: Install the meter installed in the pipe, please observe the following points release should be undisturbed. Entrance straight pipe length should not be less than 15 times the diameter. Inlet side of the elbow, reducers or shutoff valves, the inlet straight pipe length should not be less than 25 times the diameter. Outlet straight pipe length should not be less than five times the diameter (Figure 4) Figure 4 straight pipe inlet and outlet flow control valve should be installed in the downstream side of the meter (Fig. 5) as possible. Figure 5 position of the valve regulating pressure and temperature measurement mounting position 6 pressure and temperature measurement points