The Varian 4900 Differential Mobility Detector

Multi component analysis at trace levels

The Varian 4900 Differential Mobility Detector (µ-DMD) is a revolutionary new instrument utilizing a tunable ion filter to achieve unique analytical solutions.

In many applications, present GC detection technology is insufficient for (multiple-) target component analysis. The µ-DMD detects specific target components with increased sensitivity, compared to standard detection techniques.

The µ-DMD offers the capability detecting components even while they are co-eluting. The unique selectivity of the µ-DMD makes even trace analysis possible when co-eluting with bulk components. This enables the user to have an improved process control environment, resulting in a higher quality of end product.

The 4900 DMD uses dual detection technology where the µ-TCD and the µ-DMD are in serial connection. The workstation software processes both signals of the system, providing trace component information (µ-DMD), as well as matrix information (µ-TCD) within one analysis.

The µ-DMD is fully integrated into the basic 4900 Micro-GC hardware. The Micro-GC operates under standard conditions, using helium, hydrogen, argon or nitrogen as the carrier gas. All pneumatics are controlled by Electronic Gas Control (EGC). The µ-DMD uses nitrogen or 'Zero'- Air as the transport gas at a typical flow-rate of 400 mL/min. The operational conditions are integrated into the software as part of the operational method. This eliminates any peripheral instrumentation and complex method development.

The integrated design of the µ-DMD into the CP-4900 Micro-GC makes the instrument suitable for on-line, at-line analysis and monitoring.

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