HP 5970 MSD - Mass Spectrometer
The HP 5970 MSD is a standalone capillary GC
detector designed for use with a variety of gas chromatographs.
Compact and portable, this requires no cooling water or compressed
air, and operates on standard 120v power.
The mainframe includes;
- GC interface
- Electron impact ion source
- Hyperbolic quadrupole mass filter
- Electron multiplier detector
- Power supply
- Drive electronics
- Analyzer vacuum system
Software on the data systems includes programs
which automatically adjust voltages in the ion source, calibrate mass
assignment, and control scanning of the mass analyzer. Data
acquisition programs allow the operator to monitor the total ion
current, automatically storing the mass spectra of GC peaks as they
elute, or to monitor several ions in the selected ion monitoring mode.
Data editing programs provide for plotting the
mass spectra, tabulating spectra, and searching spectra libraries.
Mass selection: Scanning mode: Scans any mass
range between 10 and 800 amu in 0.1 amu steps. Up to three ranges may
be selected using time programming.
Resolution: Unit resolution throughout mass range
established automatically under computer control.
Scan speed: Eight user-selected scan rates with a
maximum of 1500 amu/second with 0.1 amu mass resolution.
Sensitivity: Typical performance for 1 ng of
methyl stearate yields a signal-to-noise ratio of better than 20:1 at
m/z 298.3 when scanned at 380 amu/second between m/z 290 and 310.
Selected Mode: Monitors up to 20 individually
selected masses at one time. Up to 10 groups of 20 masses may be
selected for each run using time programming.
Dwell time: User-selectable from a minimum of 10
milliseconds per m/z value up to a maximum of 327.57 milliseconds.
Detector: Continuous dynode electron multiplier.
Power supply to the multiplier is computer controlled. Maximum voltage