哪些因素会对智能电磁流量计产生干扰

发布时间:2018-01-18 点击:3553次 发布人:admin

电磁流量计的测量原理是基于法拉第电磁感应定律:导电液体在磁场中作切割磁力线运动导体中产生感应电势,测量流量时,导电性液体以速度V流过垂直于流动方向的磁场。导电性液体的流动感应出一个与平均流速成正比的电压,其感应电压信号通过二个或二个以上与液体直接接触的电极检出,并通过电缆送至转换器通过智能化处理。

 

正是因为电磁流量计基于法拉第电磁感应定律原理的测量方法,所以该仪表经常会受到外部原因干扰,导致测量不准确。那么哪些因素会产生干扰呢?通过我们多年的生产售后中积累的一些经验,来详述一下希望能帮助到有需要的用户:

 

1、管道杂散电流:

 

一般智能电磁流量计都有良好接地保护,通常接地电阻要小于100Q,不要和其他电机和电器共用接地。有时候环境条件较好,电磁流量计不接地也能正常工作,这里我们要建议用户即使如此还是作好接地为妥。因为一旦良好环境条件不复存在,仪表出现故障,会影响使用,再作各种检查带来诸多麻烦。有时候电磁流量计虽然良好接地,由于管道杂散电流过于强大(如电解工艺流程管线和有阴极保护管网)影响智能电磁流量计正常测量,此时须将电磁流量传感器与所管道之间作电气绝缘隔离。

 

2、静电和电磁波干扰:

 

静电和电磁波会通过智能电磁流量计传感器和转换器间的信号线引入,通常若良好屏蔽(如信号线用屏蔽电缆,电缆置于保护铁管内)是可以防治的。然而也曾遇到强电磁波防治无效的实例,此时将转换器移近到传感器附近,缩短连接的信号电缆,或改用无外接电缆的一体型仪表。

 

3、磁场干扰:

 

通常只有采取电磁流量传感器远离强磁场源,智能电磁流量计抗磁场的能力视传感器的结构设计而异,如传感器激磁线圈保护外壳由非磁性材料(如铝,塑料)制成,抗磁场影响的能力较弱,钢铁制成则较强。

 

河北宏业永泰流体机械有限公司是河北省一家知名的测控仪表生产企业,一直以来公司致力于测控仪表产品的开发与研究,产品均通过严格的测试认证,深受客户的肯定。欢迎各界客户前来咨询购买。更多流量计产品信息请关注:河北宏业永泰流体机械有限公司:http://www.hbhongye.com 

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