Issues with the instrument speed probe
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These days, while maintaining the expander of the air separation unit, I encountered a problem. When the two machines are in operation, their sounds are noticeably different; although the speed readings are the same, those operating the machines consider that the one with a lower sound level is not running at the correct speed. Because with these two machines, the low volume results in very low efficiency. Finally, the manufacturer said that the residual magnetism remaining after the rotor was machined interfered with the speed detection probe, causing incorrect readings. Is this claim true?
In our factory, there was a problem with the speed gauge of an air compressor; it was later found that the signal cable was being interfered with by the power supply. Just eliminate the interference.
How can interference be eliminated? starshine1985, please explain it more clearly
It shouldn’t be; the pulse signals received by the probe can only be detected as lost, which indicates a low value. Personal opinion
High residual magnetism can affect the probe’s detection
Filter it out; if there is data loss, simply remove the affected portion.