Inlet flow fluctuate before injection

When the gc is just turned on, all values ​​can reach normal. When a new sequence is started, the flow of the inlet suddenly becomes zero and then it starts to fluctuate. However, pressing the start button sequence on the gc machine can start.The situation is still the same in the next sequence. we changed the spetum , liner and ferrule of column.

Looking forward to your answer, thanks。

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