The ms NoVent II interface is designed to allow column changing or column maintenance to be carried out without the need to shut down the mass spectrometer. The design of the interface ensures that no air or water enters the mass spectrometer while the column is disconnected, which in turn ensures that the ion source remains contamination free. As a result a column can be changed and the instrument brought back online in minutes.
The ms NoVent II consists of an external control module along with an interface which connects directly to the existing inlet to the mass spectrometer. A fused silica transfer line, which is specific in length for the instrument, fits inside the interface.
This transfer line is designed to restrict the gas flow that can be pulled into the ion source, allowing a low pressure to be maintained in the MS.
On the oven side of the fused silica restrictor is a "Flow Director Orifice" which is actually made from inert fused silica. A helium purge is provided on the MS side of the "Flow Director Orifice" ensuring that there is flow in only one direction, thus preventing air from being drawn into the system. As a result, only pure helium can enter the MS while the system is open. Installation takes about 30 minutes.
Follow these three easy steps when ordering your ms NoVent II:
1. Select Control Unit (same for all GC’s)
2. Select the correct tee for your GC
3. Select the correct restrictor for your GC
All three items must be ordered to have a complete ms NoVent II
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