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Industry Information
Long-term stability of integrated vortex flowmeters transfer reference values to other equipment
2012-4-13 11:04:48

是应用卡门与斯特罗哈尔无关旋涡的孕育打造生与旋涡与流量干系的实际为依据来丈量蒸汽、气体及低粘度液体的流量的。 The integrated vortex flowmeter measures the flow of steam, gas, and low-viscosity liquids based on the actual creation of the vortex and flow related to Carmen and Strouhal. And adopt advanced technology to develop signal processing and calculation, high precision, firm operation and reliable quality. This product is widely used in liquid, gas and steam flow monitoring and tube bundles in various industries. Technical parameters: Nominal diameter: pipeline type DN10 ~ DN500, plug-in type DN200 ~ DN2000 Measuring medium: liquid, gas, saturated and steam, superheated steam Standard condition: P = 0.101325MPa; T = 20 ℃. Operating condition of the reducer Temperature: -40 ° C to + 65 ° C Atmospheric pressure: 86KPa to 106KPa Absolute humidity: 5% to 95% Measuring medium temperature: -40 ° C to + 350 ° C (plug-in type: -40 ° C to + 250 ° C) Maximum medium pressure: Pmax≤2.5MPa (Pmax> 2.5MPa must be specified when ordering) Accuracy grade: 0.2%, 0.5%, 1.0% Vortex accuracy can be measured in the flow rate area: liquid (0.45 m / s ~ 6.6 m / s), Gas, steam (4.5 m / s to 60 m / s digital filtering intelligent vortex precision flow field: liquid (0.29 m / s to 8.0 m / s), gas, steam (2.5 m / s to 65 m / s) Body material: 1Cr18Ni9Ti (other materials are available for negotiation) Working voltage: 12VDC (± 10%), 24VDC (± 10%), 3.6VDC (Li-ion battery life is greater than 2 years, only on-site performance type).

Output signal: Voltage pulse corresponding to instantaneous flow under working conditions (low level ≤ 1V, high level ≥ 6V, pulse width ≥ 10uS) Voltage pulse corresponding to standard instantaneous flow (limit temperature and pressure compensation integrated vortex street. Low level ≤1V, high level ≥6V) Instantaneous flow under working conditions corresponds to two-line 4-20MA output (temperature and pressure compensation integrated vortex is a three-wire system with 4-20MA output) Instantaneous flow under standard conditions corresponds to three-wire system with 4-20MA output (only for Integrated vortex street with temperature and pressure compensation) Dead band with load: RL≤500Ω (24VDC power supply) Communication door diameter: RS232 or RS485 (only for integrated vortex street or temperature compensated vortex street with temperature and pressure compensation). On-site LCD dual-line performance (temperature compensation or ordinary expression type vortex street) Door diameter: It can simultaneously display instantaneous flow and stored flow. The temperature-compensated vortex street can cyclically represent parameters such as temperature, pressure, instantaneous flow, and accumulated flow. On-site LCD three-line performance (temperature and pressure compensation integrated vortex street) Door diameter: Simultaneous performance under standard conditions instantaneous flow, standard conditions implied flow, operating temperature, operating conditions pressure, battery voltage, or performance instantaneous flows, operating conditions Flow, frequency and other parameters.

先进的压力和温度测量技术: 一体化涡街流量计基于层流原理的流量测量不确定度高度依赖于差压、气体密度和粘度,进而依赖于流动气体的压力和温度的不确定度。 Advanced pressure and temperature measurement technology of integrated vortex flowmeter: The uncertainty of flow measurement based on laminar flow principle of integrated vortex flowmeter is highly dependent on differential pressure, gas density and viscosity, and then on the pressure and temperature of flowing gas. Uncertainty. molbloc / molbox opens a new era in pressure and temperature measurement. The pressure of the upstream gas (P1) and downstream gas (P2) of the molbloc laminar flow element is sampled through a pressure-stabilizing tank, and the integrated vortex flowmeter is measured by an absolute pressure sensor located in the molbox flow terminal. In molbox1, the sensor uses The latest crystal technology achieves a resolution of 1 ppm and a stability of ± 0.01% / year. The upstream and downstream sensor readings of the integrated vortex flowmeter are averaged to determine the absolute pressure. The difference between the two pressure readings is molebloc Differential pressure on both sides. The internal molbox valve and an automatic "balance" function can make the measurement difference between the two sensors automatically zero at any time. The integrated vortex flowmeter is not affected by the current flow conditions. The patented design greatly Improved the measurement process of the gas temperature through the lambda element of the molbloc. The integrated vortex flowmeter does not measure the temperature of the gas entering or leaving the laminar flow element, but forces the gas to the temperature of the molbloc and measures the Temperature. The large heat loss of molebloc and the very large "metal-gas" contact area produced by the annular flow path of molebloc cause gas Same temperature as molbloc. Isothermal gas expansion occurs when gas flows through molbloc. The temperature of the isothermal point of the integrated vortex flowmeter is determined by measuring the temperature of molbloc. The temperature of molbloc is embedded into molbloc using two symmetry The platinum resistance thermometer (PRT) is accurately measured. The PRT is read by the ohm measurement system in molbox, which can be self-calibrated using the on-board reference resistor. A combination such as an integrated vortex flowmeter can be used to Measure the temperature of the gas flowing through molbloc with an accuracy better than ± 0.1 ℃.

出众的长期稳定性、 传递标准的作用是可靠地将参考值从基准级标准传递到其它设备。 The outstanding long-term stability and transmission standards of the integrated vortex flowmeter reliably transfer the reference value from the reference level standard to other equipment. The integrated vortex flowmeter plays this role, and the most important characteristic of the transmission standard is long-term stability. The stability of molbloc / molbox depends on three parameters: a) the laminar flow path geometry of molbloc; b) the measurement of gas pressure; c) the measurement of gas temperature. "