Stanford Research Systems RGA1 Series Residual Gas Analyzer (100 amu / 200 amu / 300 amu Quadrupole Mass Spectrometer)
| Brand | SRS/Stanford Research Systems |
|---|---|
| Origin | USA |
| Model | RGA1-100amu, RGA1-200amu, RGA1-300amu |
| Mass Range | 1–100 amu / 1–200 amu / 1–300 amu |
| Resolution | <0.5 amu (FWHM) |
| Detection Limit | 5 × 10⁻¹⁴ Torr (with EM detector) |
| Sensitivity | 2 × 10⁻⁴ A/Torr (Faraday cup) |
| Dynamic Range | 6 decades |
| Response Time | 1–2 s |
| Detector Options | Faraday Cup (standard), Electron Multiplier (optional) |
| Operating Pressure Range | 10⁻⁴ Torr to UHV (FC) |
| Max. Probe Temperature | 70 °C |
| Max. Bakeout Temperature | 300 °C (probe only, ECU excluded) |
| Interface | RS-232 |
Overview
The Stanford Research Systems RGA1 Series Residual Gas Analyzer is a compact, high-performance quadrupole mass spectrometer engineered for real-time qualitative and quantitative analysis of residual gas species in vacuum environments. Based on robust radio-frequency (RF) and direct-current (DC) quadrupole mass filtering principles, the RGA1 delivers stable, reproducible mass spectra across its three configurable mass ranges: 1–100 amu, 1–200 amu, and 1–300 amu. Designed for integration into ultra-high vacuum (UHV), high-vacuum (HV), and industrial process vacuum systems, it enables precise identification and concentration tracking of trace contaminants—including H₂O, CO, CO₂, N₂, O₂, CH₄, hydrocarbons, and outgassing byproducts—critical for semiconductor fabrication, thin-film deposition, accelerator physics, and space simulation chambers.
Key Features
- Triple-configurable mass range options: RGA1-100amu, RGA1-200amu, and RGA1-300amu—each optimized for resolution, sensitivity, and application-specific spectral coverage.
- Mass resolution better than 0.5 amu (full width at half maximum, FWHM), enabling baseline separation of adjacent peaks such as CO (28 amu) and N₂ (28 amu) under controlled tuning conditions.
- Dynamic range spanning six decades, supporting simultaneous detection of major background gases and sub-picoTorr-level impurities without manual range switching.
- Dual-detector architecture: Standard Faraday cup for high-stability, linear response down to 5 × 10⁻¹¹ Torr; optional electron multiplier (EM) for enhanced signal amplification and detection limits as low as 5 × 10⁻¹⁴ Torr.
- Fast system response: Full-spectrum acquisition and processing completed within 1–2 seconds, facilitating real-time leak detection, pump-down monitoring, and process endpoint verification.
- Thermally robust probe design rated for continuous operation up to 70 °C ambient and bakeout-compatible up to 300 °C (probe-only, with electronic control unit (ECU) removed)—ensuring compatibility with standard UHV chamber conditioning protocols.
- RS-232 serial interface for direct integration with PLCs, SCADA systems, or host computers; supports ASCII command protocol for OEM automation and custom scripting.
Sample Compatibility & Compliance
The RGA1 operates exclusively in gaseous phase and requires a conductance-limited inlet (typically via a capillary or orifice) to maintain optimal ion transmission and minimize pressure rise at the analyzer head. It is compatible with all common vacuum-compatible gases and vapors, including reactive species (e.g., Cl₂, NH₃, SiH₄) when used with appropriate stainless-steel or nickel probe materials. The instrument complies with CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). While not certified for hazardous area use (e.g., ATEX/IECEx), its intrinsically safe analog output options and low-power design support integration into Class 1 Div 2 environments when installed per manufacturer guidelines. Data integrity and audit trail functionality align with GLP/GMP expectations when used with validated software configurations.
Software & Data Management
RGA1 systems ship with fully featured Windows-based RGA Control Software, providing real-time mass spectrum display, peak identification libraries (NIST-compatible), time-resolved partial pressure trending, and customizable alarm thresholds. The software supports automated sequence scanning, multi-point calibration (using known gas standards), and export of raw data in CSV, ASCII, and binary formats for post-processing in MATLAB, Python (NumPy/Pandas), or LabVIEW. Native LabVIEW VIs are included for seamless integration into automated test benches and vacuum system controllers. All software modules adhere to FDA 21 CFR Part 11 principles when deployed with user access controls, electronic signatures, and audit-log enabled—facilitating compliance in regulated manufacturing and R&D settings.
Applications
- Leak detection and localization using helium or hydrogen tracer gas, with sub-10⁻¹⁰ atm·cm³/s sensitivity achievable via EM mode.
- Process gas composition monitoring during physical vapor deposition (PVD), chemical vapor deposition (CVD), and atomic layer deposition (ALD).
- Outgassing characterization of materials, coatings, and feedthroughs in UHV systems per ASTM E1557 and ISO 15901-2 standards.
- Residual gas profiling in particle accelerators, fusion research devices, and synchrotron beamlines.
- Chamber cleanliness validation prior to thin-film growth or electron microscopy sample loading.
- Failure analysis of vacuum components through temporal evolution of contaminant peaks (e.g., silicone oils, plasticizers, pump oil fragments).
FAQ
What vacuum level is required for optimal RGA1 performance?
The RGA1 achieves highest sensitivity and mass resolution in the 10⁻⁶ to 10⁻¹⁰ Torr range. For Faraday cup operation, stable measurements begin at ~10⁻⁴ Torr; with electron multiplier, reliable detection extends down to 5 × 10⁻¹⁴ Torr under ideal conditions.
Can the RGA1 be used for quantitative analysis without calibration?
Semi-quantitative analysis is possible using relative sensitivity factors (RSFs) embedded in the software library. However, accurate quantification requires multi-point calibration with certified gas mixtures traceable to NIST standards.
Is bakeout capability supported?
Yes—the quadrupole probe assembly is rated for bakeout up to 300 °C. The electronic control unit (ECU) must be disconnected and isolated from thermal exposure during bakeout procedures.
How is detector selection handled during ordering?
The Faraday cup is standard. The electron multiplier is an optional field-installable upgrade; both detectors share the same mounting interface and require no hardware modification to the probe body.
Does the RGA1 support remote operation over Ethernet?
The base configuration uses RS-232. Ethernet connectivity is available via optional RS-232-to-Ethernet converters or third-party serial servers compliant with TCP/IP Modbus RTU or ASCII pass-through protocols.
