CO2 level is aroud 70% in the EI source

Hello everyone! I am having a huge issue with CO2 level in the EI source of the MS. After the last time I had opened the source, when I tune the system tune evaluation report that N2 (7%), O2 (1%) and H2O levels are okay ...BUT CO2 level is aroud 70%.


It is not an issue in the helium line, neither in the gas filer. And it is not related to the column, because it is a Intuvo GC. The column does not go into the mass spec.


Any suggestion?

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