highSCD detector baseline signal

Greeting Agilent,

We have 355 SCD detector & its base line signal is reached upto 10000pa , so I have changed its furnace tube for 2 days signal came down to 200pa but next day again SCD signal reach to 10000pa & getting more response in signal. Also please suggest why it's happen in this GC SCD.

Please suggest why scd signal is high.

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