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The Hewlett Packard 5971A Series Mass Selective Detector is a stand-alone capillary GC detector designed for use with the HP 890A gas chromatograph.  It is compact and portable (mainframe weighs 21 kg), requires no cooling water or compressed air, and operates on 110/120 volts or 220/240 volts power.  The MSD mainframe includes the GC interface, electron impact ion source, monolithic quartz hyperbolic quadrupole mass filter, electron multiplier detector, power supply, drive electronics, and analyzer vacuum system.  The MSD is configured for a right-side sample inlet.