Hi vaccum value

Please, thank you very for your help, i have succed to fix the issue. But now there is another problem, when you look at the pictures, you will see that i try to autotune but the information i receive was " tune action stopped: cannot achieve constant peak widths" and when i try to load an old files the same information came Again. Also i try a detailled profille i realise that the value of the vacuum pump was 00.00 but it shoes that the ms is ok. I m realy disturb. Thank you to help me

  • Hi,


    first things first, the zero reading means the high vacuum gauge is OFF or has a fault. Try to use the menu "vacuum" and turn ON the gauge.

    If this doesn't help take a look behind the MSD, most time there is a box (depends on the vacuum gauge type you have) with a little green (ok) or red light (faulty).

    If it's red the gauge is broken and need to be replaced.


    If you don't see any peaks during atune check the following:

       Did you hear the klick noise to be sure the PFTBA valve is set to OPEN?

       Check the calibrant (PFTBA) level in the little glass bulb, is there still PFTBA left or do you need to refill it?

       Be sure the flow from the GC column is not to high, should be less than 2ml/min.

       Check your column position in the transferline, should be around 1mm from sticking out of the transferline into the ion    source.

       Use the "restore previous tune file" to load a good starting point, save it, and tune from these parameters.


    And finally, strange but happens: Maybe the column is broken?


    Hope this helps


  • Basically, for good performance of MS, Need following things:


    A good vacuum.

    A good bombardment of ion on HED.


    In picture attached by you, value of entrance lens is zero. Look like source is dirty. So better to clean it.

    For good vacuum, change rough pump oil and mist filter( if connected ) if color of oil change n filter look dirty.


    For, rugged use of MS, always keep Electron multiplier horn, ion source assy and pump oil in your own stock.


    You can change whole ion source assy and horn directly. Old ion source assy, clean and keep in nice packed to use next time. Like this you can rotate and save time.

  • Be aware, Entrance Lens could be Zero because of the bad (not complete performed) tune.

    First load a good tune file and try to see profile masses in manual tune.




  • Hi,

    Just following up. Has your question been answered?

Was this helpful?