HP - 5971

Manufactured by  HP
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The HP 5971A Mass Selective Detector (MSD) is a stand-alone capillary GC detector designed for use with the HP 5890A...

The HP 5971A Mass Selective Detector (MSD) is a stand-alone capillary GC detector designed for use with the HP 5890A 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 quadruple mass filter, electron multiplier detector,   
power supply, drive electronics, and analyzer vacuum system. The MSD is configured for a right-side sample inlet.
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Features of 5971

P 5971 Mass selective detector (MSD)  

The HP 5971 Mass selective detector (MSD) is a stand-alone capillary GC detector designed for use with the HP 5890 A Gas chromatograph.  

The base model includes:  

  • Cast - aluminum vacuum manifold  
  • Vapor diffusion high vacuum pump  
  • Mechanical foreline ( roughing ) pump  
  • Electron impact ion source  
  • Hyperbolic quadrupole mass filter  
  • Electron multiplier ( detector )  
  • Instrument control electronics  
  • Power supplies  
  • GC/MSD interface   

Real-time control of the MSD is provided by the MSD electronics according to setpoints and instructions from the data system.  

The data system sends operating parameters to the MSD and receive status information and data from the MSD. The data system software includes programs to calibrate the MSD, acquire data, and process data. It also includes utilities for file management and editing. Tuning programs can adjust voltages in the ion source, calibrate mass assignments, and control the scanning of the mass analyzer. Data acquisition programs allow you to monitor the total ion current, automatically storing the mass spectra of GC peaks as they elute ( scanning mode ) or, alternatively, to monitor the concentrations of particular ions ( selected ion monitoring mode ).

General Specifications

There are no General Specifications available.

Additional Specifications

Dynamic range: 106  
Ionization energy: 70 eV from either filament  
Mass range: 1.2 - 650 amu  
Mass resolution: 0.5 +/- 0.05 amu throughout the mass range  
Scan speed: Eight user-selected scan rates with a maximum of 2000 amu/sec with 0.1 amu mass resolution.  
SIM mode: In the selected ion monitoring (SIM) mode, the MSD monitors up to 20 individually selected masses at one time. Up to 200 groups of 20 masses can be selected from each run. Dwell time for each mass is user-selectable from 10 msec to 32767 msec.  
Temperature Control: The GC/MSD interface temperature is user-settable from 250°C to 320°C.  
Total ion mode: AC voltage-only mode, with adjustable low-mass cut-off, allows the HP 5971A to operate as a non-specific, high-sensitivity detector.  
Vacuum system: Vacuum is maintained by a vapor diffusion pump backed by a two-stage, direct-drive mechanical pump. Overall system pumping speed is approximately 60 liters/sec for helium. The vacuum system can accommodate capillary flow rates up to 1ml/minute of helium.

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