恩德斯豪斯E+H流量计 电磁流量计工作原理是：基于法拉第电磁感应定律。流量计的测量管是一内衬绝缘材料的非导磁合金短管。两只电极沿管径方向穿通管壁固定在测量管上。其电极头与衬里内表面基本齐平。励磁线圈由双方波脉冲励磁时，将在与测量管轴线垂直的方向上产生一磁通量密度为B的工作磁场。此时，如果具有一定电导率的流体流经测量管。将切割磁力线感应出电动势E。电动势E正比于磁通量密度B，测量管内径d与平均流速v的乘积。电动势E（流量信号）由电极检出并通过电缆送至转换器。转化器将流量信号放大处理后，可显示流体流量，并能输出脉冲，模拟电流等信号，用于流量的控制和调节。E=KBdv式中：E---------------为电极间的信号电压（v）B-----------------磁通密度（T）d------------------测量管内径（m）v------------------平均流速（m/s）式中k, d为常数，由于励磁电流是恒流的，故B也是常数，则由E=KBdv可知，体积流量Q与信号电压E-成正比，即流速感应的信号电压E与体积Q成线性关系。因此，只要测量出E就可确定流量Q，这是电磁流量计的基本工作原理。由E=KBdv可知，被测流量体介质的温度、密度、压力、电导率、液固两两相流体介质的液固成分比等参数不会影响测量结果。至于流动状态只要符合轴对称流动（如层流或者紊流）就不会影响测量结果的。因此说电磁流量计是一中真正的体积流量计。对于制造商和用户来说，只要用普通的水实际标定后就可以测量其他任何导电流体介质的体积流量，而不需要任何修正。这是电磁流量计的一突出优点，是其他任何流量计所没有的。测量管内无活动及阻流部件，因此几乎没有压力损失，并且有较高的可靠性 恩德斯豪斯E+H流量计 E+H 50W3H-H50A1A10A7AW DN=300
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上海颖哲工业自动化设备有限公司
上海市黄浦区北京东路668号上海科技京城东楼20C2
1、准确度等级
流量计在规定的流量范围内准确度等级、zui大允许误差应符合表1的规定。流量计误差表示使用相对示值误差。
2、引用误差
对于用于瞬时流量指示的流量计误差表示也可使用引用误差，其zui大允许误差系列应符合表1规定，其检定结果的标书中不再给出准确等级，而使用其zui大允许误差表示，且还应在zui大允许误差后标注FS，如±0.5%FS。
3、误差表示方法和选取原则
在一台流量计的一次检定中，应按照准确度等级和引用误差之中的一种给出流量计误差表示方法；对于使用相对示值误差和引用误差组合表示误差的流量计，一次检定中也应统一使用一种方法表示其误差。
4、重复性
流量计的重复性不得超过相应准确度等级规定的zui大允许误差值的1/3。 适用于卫生、食品、饮料或过程应用的流量测量
产品应用 ：E+H电磁流量计
可用于测量电导率≥50μS/cm的液体流量：
•饮料，例如：果汁，啤酒或葡萄酒 •鲜奶制造 •化学水处理（酸、碱、盐） 公称直径：DN 0-100
3A认证和EHEDG测试
•简单的测量电流输出用于显示流量，脉冲输出用于驱动外部累加器或作为状态输出
•Promag10能够确保所有基本功能的可靠性，安全性和测量值的稳定性
•优化的过程控制精度为+0.5%
•PTFE衬里确保zui大的抗腐蚀性而且耐温高达130℃
•在绝大多数的困难条件下都可进行装配（例如:轴，震动或长期处于水下），传感器可不带传感器独立安装，且保护等级为IP68
•功能化设计使得维护工作简单易行，HART、Fieldtool和FieldCheck对设备的核查提供支持，从而不需要移动传感器 |
