KJ1740X1-BA1
下表提供了在两相流条件下可能影响测量性能的影响量的常见形式。两相流性能影响因素影响类型对测量的特定影响建议VOS/流体压缩性由于声学频率和驱动模式之间的相互作用而导致读数过高选择在超低（1）或低驱动频率范围内工作的流量计，以避免VOS影响。由于气泡或颗粒相对于流体的运动而导致读数不足，可增加流体粘度，减小气泡尺寸，或使用驱动频率较低的仪表，以尽量减少解耦。信号处理噪声在高噪声条件或快速工艺变化期间信号稳定性差选择使用高速质量和密度信号处理方法有效抑制噪声的电子设备。（1） 请参阅所有型号的操作驱动模式频率范围。佳实践：安装和选择两相流量传感器的流量计佳实践：■ 确保流量计尺寸正确，以保持流量比标称值大5:1。■ 以选方向安装仪表。有关基于流体类型的方向，请参阅Micro Motion ELITE Coriolis流量和密度传感器安装手册■ 选择具有低可用工作频率的仪表设计。变送器和电子设备佳实践：■ 启用多相严重性警报，以便在出现两相流时准确检测。■ 选择具有实时时钟和historian功能的仪表，以诊断过程事件或混乱。■ 在需要密度或体积流量的间歇式高%GVF或%液体体积分数（LVF）装置中使用相位测量。所有型号参考条件下的工作驱动模式频率范围：14.7 psig（1.014 barg）和60°F（16°C）下的水。超低（300 hZ）不建议用于两相流装置

following table provides common forms of influence quantities that can affect measurement performance during two-phase flow conditions. Two-phase flow performance influence factors Type of influence Specific influence on measurement Recommendation VOS / fluid compressibility Over-reading due to interaction between frequency of the acoustic and drive modes Select a meter that operates in an ULTRALOW(1) or LOW drive frequency range to avoid VoS effects. Decoupling Under-reading as a result of bubble or particle movement with respect to the fluid Increase fluid viscosity, decrease bubble size, or use a meter with lower drive frequency in order to minimize decoupling. Signal processing noise Poor signal stability during high noise conditions or rapid process changes Select advanced electronics that use high-speed mass and density signal processing methods for effective noise rejection. (1) See Operating drive mode frequency range for all models. Best practices: installing and selecting meters for two-phase flow Flow sensor best practices: ■ Ensure that the meter is sized correctly to maintain a flow rate greater than 5:1 turndown from nominal. ■ Install the meter with the preferred orientation. For orientation based on fluid type, see the Micro Motion ELITE Coriolis Flow and Density Sensors Installation Manual ■ Select a meter design with the lowest available operating frequency. Transmitter and electronics best practices: ■ Enable multiphase severity alerts to accurately detect when two-phase flow is present. ■ Select a meter with a real-time clock and historian capabilities to diagnose process events or upsets. ■ Use Advanced Phase Measurement in intermittent high %GVF or % Liquid Volume Fraction (LVF) installations where density or volume flow is required. Operating drive mode frequency range for all models Reference conditions: water at 14.7 psig (1.014 barg) and 60 °F (16 °C). ULTRA-LOW ( 300 hZ) Not recommended for two-phase flow installations