Stanford Research QMS300

The Stanford Research Systems QMS300 is a high-pressure quadrupole mass spectrometer designed for on-line process monitoring, gas composition analysis, and leak detection. It analyzes gases at pressures from 10 mbar to 1 bar using a two-stage pressure-reducing inlet that allows residual gas analysis at high vacuum. The compact, transportable unit integrates mass spectrometry, pumping technology, and sampling inlet into a single package capable of operation in any orientation thanks to oil-free pumps.

– Technical Specifications

• Mass Range: 100, 200, or 300 amu
• Pressure Range: 10 mbar to 1 bar
• Resolution: Better than 1 amu
• Response Time: Less than 0.5 seconds
• Dynamic Range: 6 decades
• Sampling Flow Rate: Several milliliters per minute
• Data Acquisition Rate: Up to 25 points per second for individual masses
• Spectrum Acquisition: Complete spectra in seconds
• Detector Options: Faraday cup (standard) or electron multiplier
• Filament: Dual ThO2/Ir

– Key Features

• Two-stage pressure-reducing inlet reduces pressure by up to three decades before the RGA
• Selectable capillaries accommodate varying sample pressures
• Front-panel control of inlet valves and pumps simplifies operation
• Continuous gas sampling and data acquisition without batch processing
• Oil-free pumps enable operation upright or on its side

– Typical Applications

• On-line process monitoring
• Gas composition analysis
• Leak detection
• High-pressure gas analysis

– Compatibility & Integration

The QMS300 ships with RGA Windows software providing graphical data acquisition and instrument control. Features include analog and histogram scan modes, pressure versus time plots, leak detection, annunciator mode, gas library, and audio/visual alarms. An RS-232 interface enables data transfer to host computers. LabVIEW drivers and a high-level ASCII command set support integration into user-developed control programs.