Agilent 7200A QTOF Emission Current Tuning High

Hi all, following a column change we decided it was about time to clean the ion source (given that it had been a few months since cleaning, not that we were seeing a significant drop in sensitivity).

 

Since cleaning the EI source, the emission current, which we are typically seeing tuning at 10-25uA, is now tuning repeatedly at 35uA. Even after a second cleaning of the ion source. The system has also tuned at 35uA with the second filament used during the tune. The abundance/counts of the target ions are also approximately a third of what we typically see. 40,000 cps of the 69 ion, vs a typical abundance of 130,000.

 

Any ideas are much appreciated!

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  • Hi,

     

    I agree with atikorn, sometimes a good looking filament isn't good enough. 

     

    Also be sure to replace BOTH filaments at the same time. In some cases the unused filament causes the error because both filaments are on the same circuit.

     

    BR

    pwd

Reply
  • Hi,

     

    I agree with atikorn, sometimes a good looking filament isn't good enough. 

     

    Also be sure to replace BOTH filaments at the same time. In some cases the unused filament causes the error because both filaments are on the same circuit.

     

    BR

    pwd

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