Emerson mass flow meter A3 fault alarm
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After testing, it was found that the resistance value of the right-side detection coil is 600 ohms higher than that of the left-side coil (889 ohms); this caused an A3 fault alarm. The system became normal temporarily during troubleshooting, and the resistance values were the same as before, after which it worked properly again. When one of the wires connected to the drive coil was broken, the A3 alarm appeared again. The voltage of the left-side detection coil remained at 0.6V, while the voltage of the right-side detection coil was 0V. The drive gain and operating frequency were normal. What is the cause of this fault?
Based on your description, I personally think it’s due to poor contact at the coil connection
It’s still confirmed to be a coil issue