A Breakthrough Analyzer Concept
The DELTA V Advantage is prepared for a field upgrade to the full performance of the DELTA V Plus.
Analyzer
The DELTA V uses a weld-free monolithic analyzer, with the ion source housing, flight tube, collector housing and amplifier housing precision machined from one single block. No component can move and no alignment is necessary during installation or maintanance. The magnet is precision-mounted into the monolithic analyzer with intrinsic alignment, its pole faces determining the free flight space for the ions, thus eliminating the traditional flight tube. The gain in ion beam height directly translates into increased sensitivity.
The vertical orientation of the analyzer gives direct access to the plug in ion source making ion source maintenance easy and straight forward.
The novel analyzer design enables very effective pumping. The vacuum system has been completely redesigned, enabling singlestage turbo-pumping for all normal continuous flow applications. Differential pumping is available for the most demanding applications.
Integration of the signal amplifier and digitizer housing into the analyzer block ensures short connections, identical thermal conditions and the absence of any noise-pickup. Evacuation of the amplifier housing eliminates signal spikes due to cosmic rays.
The ion optics of the DELTA V provide higher sensitivity and a larger mass dispersion.
Ion Source
The electron impact ion source is self-aligning and plugs into the front flange of the analyzer block. The proven design combines very high sensitivity with excellent linearity for all Dual Inlet and He carrier gas Continuous Flow applications.
The same filament is used for all gas species, no exchange is needed for H2. Ion source parameters are controlled by the data system and can be stored and retrieved. Tuning is manual or automatic. Automatic fine-tuning (e.g. re-tuning) is activated by push-button action.
The sample gas is introduced at ground potential, eliminating the need for insulation of the flow path, ensuring 100 % transfer into the ion source. The weld-free design, together with radiant heating of all surfaces in the ion source, virtually eliminates memory and background.
Ion Optics
The ion optics of the DELTA V have been thoroughly refined, achieving higher sensitivity and a larger mass dispersion. Mass dispersion is about twice that of bench-top isotope ratio MS. The new ion optics are image error corrected and designed to accept an extremely wide angular ion distribution.
The new ion optics and the wider magnet gap lead to extremely high ion transmission from the ion source to the collectors, which directly translates into sensitivity.
In addition, the mass range at full acceleration voltage has been increased to m/z 96 at a mass resolution of better 110, extending the range of applications.
With the new ion optics the specifications of the DELTA V Advantage exceed those for the prior highest performance DELTA, the DELTAplus XP.
Due to further refined ion optics, the DELTA V Plus is able to accept an extremely wide angular ion distribution while still accurately focusing all ion beams in the wide image plane. The refined ion optics lead to even higher sensitivity and flexibility in collector configurations which allow unique cup configurations at higher masses.
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