Issues related to electromagnetic flowmeters
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I have a question: If the electrodes are dirty, it is possible to measure the voltage of the two shielding wires carrying the signal; if this voltage is greater than 1V, it indicates that the electrodes need to be cleaned. So, 1. Are the ends of the two shielding wires carrying the signal connected to terminals on the converter, while their other ends at the electrodes remain unconnected? 2. The two shielding wires for the measurement signal are called the internal leakage wire and the external leakage wire. Why are they named this way? 3. Why does a value greater than 1V indicate dirty electrodes? I’ve been thinking about this problem without any results; the key issue is that it’s not clear where the two shielding wires for the measurement signal end at the electrodes. Please give me some advice. Thank you
It would be best to post the original text of the operation manual so that it can be used as a reference for judgment.