公开(公告)号：US3783686A

公开(公告)日：1974-01-08

申请号：US3783686D

申请日：1971-11-05

申请人： FISCHER & PORTER CO

发明人： HENTSCHEL R

IPC分类号： G01F1/60 ,  G01F1/04

CPC分类号： G01F1/60

摘要： A magnetic flowmeter in which a pair of metering electrodes is disposed at diametrically opposed points in a flow tube through which flows the fluid to be measured, a magnetic field being established at right angles to the direction of flow by an excitation winding. The winding is energized by a cyclical voltage derived from an a-c power line, the polarity of the cyclical voltage being reversed at a rate which is a sub-multiple of the line frequency whereby each interval between successive points of reversal contains the same number of full cycles and the polarity of the last half cycle in each interval is the same as the first half cycle in the succeeding interval. The arrangement is such as to cancel error voltage components resulting from line frequency disturbances.

摘要翻译： 一种电磁流量计，其中一对计量电极设置在流动管中的径向相对的点处，流过待测量的流体，通过激励绕组与流动方向成直角建立的磁场。 绕组由来自交流电源线的周期性电压供电，周期性电压的极性以相当于线频率的倍数的速率反转，从而连续的反转点之间的每个间隔包含相同数量的满 周期和每个间隔中最后一个半周期的极性与后续间隔中的前半个周期相同。 该布置是为了消除由线路频率干扰导致的误差电压分量。