Do you know other possible causes for "Electrode saturation error" message for a 8732E/8705 magmeter ?
I know the official explanation:
"The Electrode Saturation error is a process related error. There are two situations that can lead to the electrode saturation:
1) The average voltage coming in through the electrodes is greater than 600 mV. Typical max voltage for flow signal is less than 2 mV. This would typically mean there is some stray DC current in the process fluid and/or piping system.
This can be induced by improper grounding. See Chapter 2.11 from page 21 of attached manual for proper grounding instructions. If the transmitter is remote, please make sure that they use the Rosemount cable and that it is properly connected.
2) The difference in voltage coming in through each electrodes is greater than 600 mV. This can be caused by a coating on one electrode or a partial short in one electrode causing an imbalance it the resistance of the electrode circuits.
The standard front-end circuitry is DC coupled and when saturated it can turn that front-end circuitry into a capacitive circuit. This allows a charge to build up until the transmitter can no longer read the flow signal (front-end saturation). When this happens the transmitter will drop to an output reading of 0 flow.
It usually takes cycling power and/or disconnecting sensor wires to dissipate the charge and allow the transmitter to start reading flow again.
However, without resolving the issue the transmitter will become saturated again and drop to 0 flow. This saturation can take anywhere from a few minutes to several months to happen depending on the severity of issue."
In fact this message appeared for 3 flowmeters of this type produced in 2016. None of the above described causes has been found (by Emerson's representative), another flowmeter from another company works smoothly. Is it possible to be a bug ?
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