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 ).

HP 5971 MSD 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.

This used HP 5971 Mass selective detector (MSD) is really in a great shape and tested at SpectraLab Scientific. 90 days warranty included.

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