The lower tower liquid level gauge has been fluctuating recently!!
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For some unknown reason, the liquid level gauge in the lower tower has been fluctuating from time to time. First, when the liquid level went down and went up the tower, the oxygen-enriched night sky was opened. The valve was opened wide, resulting in insufficient liquid level in the crude argon condenser. The valve was opened wide, and then the liquid level suddenly dropped. The argon fraction first plummeted and then skyrocketed. If it was serious, it would cause nitrogen blockage.
Is it a problem with the liquid level gauge guide tube? If this happens often, I suggest you turn the lower tower into the upper tower control valve manually.