科隆电磁流量计常见故障

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◆仪表结构简单、可靠，无可动部件，工作寿命长。
◆无截流阻流部件，不存在压力损失和流体堵塞现象。
◆无机械惯性，响应快速，稳定性好，可应用于自动检测、调节和程控系统。
◆测量精度不受被测介质的种类及其温度、粘度、密度、压力等物理量参数的影响。
◆采用聚四氟乙烯或橡胶材质衬里和Hc、Hb、316L、Ti等电极材料的不同组合可适应不同介质的需要。
◆备有管道式、插入式等多种流量计型号。
◆采用EEPROM存贮器，测量运算数据存贮保护安全可靠。
◆具备一体化和分离型两种型式。
◆高清晰度LCD背光显示。
(科隆电磁流量计常见故障)

(科隆电磁流量计常见故障)

10.具有自检与自论断功能。
11.小时总量计录功能,以小时为单位记录流量总量,适用于分时计量制(选配)12.内部具有三个积算器可分别显示正向累计量反向累计量及差值积算量,内部设有不掉电始终,可记录16次掉电时间。(选配)
13.红外手持操作器,115KHZ通讯速率,远距离非接触操作转换器所有功能。(选配)
三,工作原理：
一体式电磁流量计测量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。
(科隆电磁流量计常见故障)

待测液体中含有气泡
这算是一种常见现象，有外界吸入的也有内部液体溶解所致，但电磁流量计是区分不出液体还是气泡的，所以将其一并计算测量就会产生误差。
导电沉积层短路效应
由于导电物质是逐渐沉积，流量信号出现短路现象。本类故障通常不会出现在调试期，而要运行一段时期后才显露出来。
遇到结晶液体
在选型时，大家经常会遇到介质是容易结晶的物料。虽然大部分物料在正常温度下能够正常测量，并且导管具有伴热保温效果。但是流量计内部的传感器测量管不含此功能，所以经常性的流体流过测量管时因降温而引起内壁结上一层固体。
(科隆电磁流量计常见故障)

电磁流量计无流量信号输出检查流程故障检查和采取措施1：述5方面故障原因的检查的采取措施1、查电源方面故障检查流程图第1，第2项。首先确认己接入电源，再检查电源各部分。管道杂散电流干扰通常采取良好单独接地保护可获得满意测量，但如遇管道有强杂散电流（如电解车间管道）亦不一定能克服，须采取流量传感器与管道缘绝的措施。查主电源和激磁电流熔丝，若接入符合规定电流值新熔丝再通电而又熔断，必须找出故障所在点。查电源线路板输出各路电压是否正常，或试置换整个电源线路板。2、查连接电缆系统方面故障检查流程图第3项。分别查连接激磁系统和信号系统的电缆是否通，连接是否正确。
(科隆电磁流量计常见故障)

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