Collision gas usage

[Altier, Dan]

Hello All,

 

Any input would be appreciated.  My QTOF was installed in July 2007.  I have noticed that my collision gas (nitrogen) tank is still at ~2400 PSI which is about the pressure expected in a brand new tank.  I have been using my instrument almost exclusively in MS mode.  It is only recently that I have been using MS-MS mode and I have been having trouble getting nice consistent MS-MS spectra.  I was told that I should have used up the collision gas nitrogen a long time ago because it is used in both MS and MS-MS modes.  Can any of you tell me what your collision gas usage has been?

 

Best regards,

 

Dan

 

 

 

Daniel J. Altier

Pioneer, A DuPont Company

7300 NW 62nd Avenue

Reid E-2K09

Johnston, IA 50131

 

(515) 253-2259 desk

(515) 270-4252 lab

 

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[Arindam Roy]

I believe I change the colision gas once in 6 months but I do a lot of MS/MS.

"Altier, Dan" <dan.a...@pioneer.com> wrote:

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[Altier, Dan]

Thanks Roy. 

 

Do you use a full size lab gas cylinder for the nitrogen collision gas?

 

Regards,

 

Dan

 

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[Roy, Arindam]

Yes Dan. Its from Airgas. I have just checked the cylinder this morning and its now 2000 psi after 6 months or so. I would monitor the outer gage, I think you don't want to go less than 15 psi, right?

 

Best,

Roy

 

 

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From: QT...@googlegroups.com [mailto:QT...@googlegroups.com] On Behalf Of Altier, Dan
Sent: Thursday, May 08, 2008 8:41 AM
To: QT...@googlegroups.com
Subject: RE: Collision gas usage

[Andy G]

The QToF uses about 1 ml/min of collision gas, if there is not a
leak. Typically the large cylinders (~5 ft tall) will last more than
a year. It should remain on during MS or MS/MS operation and the such
the scan type should not impact usage.

Andy

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