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- Agilent Heaters and SensorsMass Spectrometry, Scientific Supplies & ManufacturingScientific Instrument Services 5973 Source Heater Tamper Resistant Allen Wrench 5973/5975 Quad Sensor 5985 Source Heater Assembly Agilent Interface Heater Assembly 5971 Interface Heater
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- Mass Spec Tips1 - Freon for use in Mass Spectrometer Leak Checking 2 - Mass Spectrometer Probe Cooling 3 - Sample Vials for Direct Probes 4 - Selection of Vacuum Pump Oils for Lowest Mass Spec Background 5 - Determination Linkages in Biomolecules of Disulfide 6 - Transfer of H.P. ChemStation MS and GC Chromatograms from PC to MAC Computer 7 - Repairing Clogged Thermospray Probes 8 - Tuning a Finnigan 5100 to Meet BFB or DFTPP Criteria 9 - H.P. 5971 Transfer Line Tip for Direct Introduction of Capillary Column 10 - Troubleshooting Finnigan 5100 GC/MS Systems 11 - Leak Checking Mass Spectrometers 12 - Elimination of Memory Peaks and GC Background Noise 13 - SuperIncos Mapped Software Print Buffer Lockup 14 - Reduction of Peak Tailing 15 - Electron Multiplier Sensitivity 16 - INCOS Procedure for Calibrating on the Finnigan 4500 17 - Extending Electron Multiplier Life 18 - What techniques or methods do you use to determine if the electron multiplier 19- What techniques or methods do you use to detect vacuum leaks in your mass spectrometer 20 - Extending Lenear Range of the Mass Spec Article - Improving Sensitivity in the HP 5971 Mass Spectrometer - Part 1 and Part 2
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- 9 - H.P. 5971 Transfer Line Tip for Direct Introduction of Capillary Column (This Page)
Mass Spec Tips is a collection of tips relating to the operation
and service of mass spectrometers. Some of these Tips have been
reported in our newsletter, "The Mass Spec Source."
If you have a question relating to the operation or service of
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tip and would like to have it included in this forum, please contact us.
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Author: John J. Manura
Affiliation: Scientific Instrument Services
In the original gold plated transfer line tip on the H.P. 5971 MSD (H.P. Part # 05971-20305), the GC capillary column is purged inside this fitting and diverted through side vents and then vented into the MSD source. This original H.P. design exposes the analytes being chromatographed to a hot metal surface before they enter the MSD source. Loss of sensitivity for some compounds can result from both the indirect transfer line path and also due to sample decomposition upon exposure of thermally labile compounds to the hot metal surfaces.
As a result we have redesigned the Transfer Line Tip for the H.P. 5971 MSD to permit the end of the fused silica capillary column to purge directly into the MSD source. The new S.I.S. design eliminates any metal contact with the sample - the GC capillary column protrudes directly through the Transfer Line Tip and into the MSD source. This new design should result in higher sensitivity due to this straight path for sample flow and the elimination of contact by the compounds being chromatographed to any metal surface in the transfer line.
When inserting the capillary column through the MSD interface and into the MSD source, it is necessary to remove the MSD interface in order to properly position the capillary column at the end of the Transfer Line Tip, since there is no physical stop at the end of this fitting. After the capillary column with accompanying nut and ferrule are attached to the MSD interface, the capillary column should be adjusted so that the capillary column protrudes past the end of the Transfer Line Tip between 0 and 1.0 mm. After this distance has been set the GC nut and ferrule should be tightened to seal the capillary column in the correct position and the MSD interface can be reattached to the MSD.
The new Transfer Line Tip is available from Scientific Instrument Services.
(Part # HP99, price $79.00 each.)