What is my Source Exhaust and how does it work?


日付: 09/12/2017
カテゴリー: Mass Spectrometers

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For research use only. Not for use in diagnostic procedures.


Answer

The source exhaust is a solvent collection box where atomized solvent and sample collect and condense.  The exhaust collects the parts of the sample that are not ionized and transferred to the analyzer region.

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A Teflon sleeved tube draws the condensed solvents from the bottom of the exhaust block by a vacuum differential through a venturi block.  The venturi operates by principle of a high volume gas passing by a smaller orifice creating a negative pressure.  This negative pressure draws the solvent (vapor and condensate) into the high volume gas, and then to a waste vessel.
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Solvents used in a typical analysis may be hazardous if breathed in an open atmosphere.  For this reason, the waste vessel is a closed system with the inlet tube from the mass spectrometer, and an outlet tube to a negative flow environmental exhaust that meets local governmental requirements.
The critical components of the source exhaust that can cause problems are the venturi gas supply, the venturi outlet/waste, and the line to the waste vessel.  These conditions can lead to a blocked venturi, or a flooded exhaust drain.