| 电磁流量计接地要求 |
| 信息来源： 流量变送器生产 | 2019-05-23 点击量： 5538 |
电磁流量计接地要求，西安华恒仪表介绍：电磁流量计的接地，一般用于接地的管道绝大部分是塑料管道或者其他非金属管道，因为这些管道不导电，管道本身不会做接地处理，电磁流量计为了抗干扰和雷击必须单独做接地。
The grounding requirement of electromagnetic flowmeter is introduced by Xi'an Huaheng Instrument:The grounding of electromagnetic flowmeter is generally used for grounding pipelines,mostly plastic pipelines or other non-metallic pipelines.Because these pipelines are not conductive,the pipeline itself will not be grounded.In order to resist interference and lightning stroke,the electromagnetic flowmeter must be grounded separately.
电磁流量计传感器输出信号的接地点应与被测介质电气连接，这是电磁流量计工作的必要条件。如不满足这个条件，电磁流量计就不能正常工作，这是传感器的信号回路决定的。当流体切割磁力线产生流量信号时，是以流体本身作为零电位的，一个电极上的产生正电势，另一个电极上产生负电势，不断交替变化。
The grounding point of the output signal of the electromagnetic flowmeter sensor should be electrically connected with the measured medium,which is the necessary condition for the electromagnetic flowmeter to work.If this condition is not satisfied,the electromagnetic flowmeter will not work properly,which is determined by the signal circuit of the sensor.When flow signal is generated by fluid cutting magnetic force line,the fluid itself is used as zero potential.Positive potential is generated on one electrode and negative potential is generated on the other electrode,which changes alternately.
因此，转换器输入端中点（信号电缆屏蔽层）必须与流体共处于零电位且导通，这样才能构成对称的输入回路。转换器的输入端中点是通过传感器输出信号的接地点与被测流体电气连通的。
Therefore,the midpoint of the input terminal of the converter(signal cable shielding layer)must be at zero potential with the fluid and on,so as to form a symmetrical input loop.The input midpoint of the converter is electrically connected with the measured fluid through the grounding point of the output signal of the sensor.
1.仪表的接地点应是一个独立的接地点，不允许与其他电气设备的接地线连接在一起。接地电阻应小于10Ω，有些型号仪表规定应小于100Ω。
1.The instrument should be connected at an independent place,and it is not allowed to be connected with the grounding wires of other electrical equipment.Grounding resistance should be less than 10,and some types of instruments should be less than 100.
2.当传感器安装在绝缘管道上时，两端必须安装接地环，然后用导线连接，与流体“导通”，如果被测介质导电率较低，可用金属短管代替接地环，确保接地效果。接地环作用同第一条。金属工艺管道和介质直接接触，接地线直接和金属管道或法兰连接，所以不需要接地环。
2.When the sensor is installed on the insulating pipeline,grounding rings must be installed at both ends,and then connected with wires to"conduct"the fluid.If the conductivity of the measured medium is low,metal short tubes can be used instead of grounding rings to ensure the grounding effect.The grounding ring acts as the first one.The metal process pipeline is directly contacted with the medium,and the grounding wire is directly connected with the metal pipeline or flange,so the grounding ring is not needed.
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