I have problem But I dont Know why it happens
I installed new column and keep one end (MS side) open for the purpose of cleaning and i run on GCMS and Agilent software. At the Beggining the Turbo speed was increasing but after reaching 70% is start to decrease and Now 0.9-1% and continuing. The GCMS is working. However, Before new column installed it was working nicely.
Please suggest me. How to fix this problem to get 100% turbo speed.
If the MS portion is truly working, something is giving an incorrect reading or display. Try to restart your computer. If the system is collecting data while running on the roughing pump alone, I'd be a little surprised to see good results.
If the turbo-molecular pump is truly running at a very low speed, the only vacuum is from the roughing pump, assuming it is running. Check that the roughing pump is running, and check for leaks going to the roughing pump. The rotor and stator vanes on a turbo pump are very delicate and MS systems will shut this pump down to avoid damaging it, if the vacuum isn't low enough. My experience has been that the roughing pump was off when this occurs.
Put the side back on in case there is an interlock to keep people from being exposed to high voltages too.
If the MS portion is truly working, something is giving an incorrect reading or display. Try to restart your computer. If the system is collecting data while running on the roughing pump alone, I'd be a little surprised to see good results.
If the turbo-molecular pump is truly running at a very low speed, the only vacuum is from the roughing pump, assuming it is running. Check that the roughing pump is running, and check for leaks going to the roughing pump. The rotor and stator vanes on a turbo pump are very delicate and MS systems will shut this pump down to avoid damaging it, if the vacuum isn't low enough. My experience has been that the roughing pump was off when this occurs.
Put the side back on in case there is an interlock to keep people from being exposed to high voltages too.
You aren't seriously trying to tell us that you didn't install the column in the MS prior to starting the system? Of course your pump speed is less than 1%; you can't run the MS with an atmospheric inlet!!
It sounds like the turbo pump shutdown due to high pressure. This is most likely due to not closing the inlet to the MS. Back in the day we used to do that by installing a short part of an old GC column (sticking out of the MS inlet a few centimeters) and plugging by sticking the end that sticks out into a rubber septa. Your instrument might have more modern ways of doing the same.
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