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Industry Information
Special detection of electromagnetic flowmeter
2011-10-7 16:17:18

测量电极勺液体接触电阻值,可以不从管道卸下流量传感器而间接估汁电极和衬里层表面大体状况,有助于分析故障原因。 I. Electrode contact resistance measurement : Measuring the liquid contact resistance of the electrode spoon can indirectly estimate the general condition of the surface of the juice electrode and the lining layer without removing the flow sensor from the pipeline, which is helpful to analyze the cause of the failure.

测量电极与液体间极化电压将有助于判断零点不稳或 输出晃动的故障是 不是 由于电极被污染或 覆盖所引起的。 Second, the polarization voltage of the electrode : Measuring the polarization voltage between the electrode and the liquid will help determine whether the zero point instability or the output shaking is caused by the electrode being polluted or covered. Using a digital multimeter 2V DC range, measure the polarization voltage between the two electrodes and ground separately (the electromagnetic flowmeter can be measured without power failure or power failure ) . 的时候 ,说明电极 没有 被污染或 被覆盖, 要不然 说明电极被污染或 被覆盖。 If the two measurements are nearly equal , the electrode is not contaminated or covered, otherwise the electrode is contaminated or covered. 大小决定于电极材料的电极电位和液体的性质,测量值可能在几mV 几百mV 之间。 The magnitude of the polarization voltage depends on the electrode potential of the electrode material and the nature of the liquid, and the measured value may be between several mV and several hundred mV . 两电极被污染情况不可能完全相同对称, 因此 两电极上的电压形成了不对称的共模电压。 Because the two electrodes in operation cannot be completely symmetrical, the voltage on the two electrodes forms an asymmetric common-mode voltage. 不对称的共模电压就成为差模信号, 因此 造成 电磁流量计 零点偏移。 Because the asymmetric common-mode voltage becomes a differential-mode signal, it causes the zero offset of the electromagnetic flowmeter .

信号电缆受外界静电感应和电磁感应干扰 会使电磁流量计零点变动。 3. Measurement of signal cable interference : The signal cable is affected by external static and electromagnetic interference , which will cause the zero point of the electromagnetic flowmeter to change. 判断零点变动是 不是 由于受信号电缆干扰电势影响,需 测定干扰大体范围和对电磁流量计的影响程度。 In order to determine whether the zero point change is due to the interference potential of the signal cable, it is necessary to determine the broad range of interference and the degree of influence on the electromagnetic flowmeter.

没有 接地电位 电磁流量计 在正常使用过程中,如 传感器附近电机状态变化( 如漏电) ,接地电位会产生变化而引起零点变动。 Fourth, determine whether there is ground potential : In the normal use of the electromagnetic flowmeter , if the state of the motor near the sensor changes ( such as leakage ) , the ground potential will change and cause zero point changes. 检查是 不是 有这方面影响 的话 ,可 将转换器工作接地C 端子与保护接地 G 端子短路,以零点或 指示值变动判断 是不是 接地电位。 If you want to check whether there is any influence in this respect , you can short circuit the working ground C terminal of the converter and the protective ground G terminal, and judge whether it is the ground potential based on the zero point or the change of the indicated value .

有时侯为 寻找管道杂散的干扰源在流量传感器上游还 在下游,以缩小搜索范围,设法减小或 消除杂散电流干扰影响。 V. Discrimination of pipeline stray current flow : Sometimes, in order to find the pipeline stray interference source upstream or downstream of the flow sensor , in order to narrow the search range, try to reduce or eliminate the influence of stray current interference.