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    • 19. 发明公开
    • Magnetic flow meter
    • MAGNETISCHER DURCHFLUSSMESSER
    • EP2360456A1
    • 2011-08-24
    • EP10012708.3
    • 1999-09-28
    • SCIENTIFIC GENERICS LIMITEDSENSUS TECHNOLOGIES, INC.
    • Dames, Andrew NicholasEngland, James Mark CarsonJones, Ross PeterTopliss, Richard JohnAnsell, IanCollier, NicholasLodge, GrahamHember, Miles William Noel
    • G01F1/58
    • G01F1/584G01F1/586G01F1/60G01F15/00
    • A magnetic flow meter (20) includes a cylindricaL vessel (34) within which electrodes (42) are placed directly opposite each other about a magnetically permeable core (44). In that way, two flow channels are obtained in the vessel. A common magnetic field is applied across both flow channels. The magnetic flow meter (20) is used in conjunction with a controller (100) which monitors amplitude modulated signals representative of applied magnetic field and induced electric field. These amplitude modulated signals are passed to Sigma-Delta modulators, which directly digitise the amplitude modulated AC signals into digital pulses. The controller is capable of monitoring reverse flow through the meter, and to store results until forward flow resumes. Moreover, the controller generates a driving signal for coils (64) which generates a magnetic field, the coil being placed in conjunction with a capacitor (416) which causes resonance. This reduces power consumption by the coil in driving the meter.
    • 磁流量计(20)包括圆柱形容器(34),电极(42)围绕磁导体芯(44)彼此直接相对放置。 以这种方式,在容器中获得两个流动通道。 在两个流动通道上都应用常见的磁场。 磁流量计(20)与控制器(100)结合使用,该控制器监视表示所施加的磁场和感应电场的振幅调制信号。 这些幅度调制信号被传递到Σ-Δ调制器,其将幅度调制的AC信号直接数字化为数字脉冲。 该控制器能够监视通过仪表的反向流量,并存储结果,直到前进流程恢复。 此外,控制器产生用于产生磁场的线圈(64)的驱动信号,该线圈与引起共振的电容器(416)一起放置。 这样可以降低线圈在驱动仪表时的功耗。