Agilent G6120A Single Quadrupole Liquid Chromatography-Mass Spectrometer (Refurbished)

Overview

The Agilent G6120A Single Quadrupole Liquid Chromatography-Mass Spectrometer is a fully refurbished, performance-validated benchtop LC/MS system engineered for robust quantitative and qualitative analysis in regulated and research laboratories. Based on Agilent’s proven 6100 series architecture, the G6120A integrates a high-pressure Agilent 1200 Series HPLC module with a temperature-controlled, double-curved metal quadrupole mass analyzer and orthogonal electrospray ionization (ESI) source. Its design adheres to fundamental principles of quadrupole mass filtering—where RF/DC voltage ratios selectively transmit ions of defined mass-to-charge (m/z) ratios through a stable Mathieu stability region—enabling unit-mass resolution across a wide dynamic range (m/z 10–3000). The system operates under high vacuum conditions maintained by a two-stage differential pumping system: a mechanical backing pump coupled with a turbomolecular pump ensures stable ion transmission and low chemical noise. Unlike legacy systems, the G6120A features a compact footprint (less than 0.5 m²), reduced power consumption, and a simplified pneumatic/electrical interface—making it suitable for QC labs, academic core facilities, and contract testing organizations requiring reliable, entry-level mass spectrometric detection.

Key Features

• Orthogonal ESI source with grounded spray needle and self-aligning capillary geometry—minimizes solvent droplet carryover and enhances long-term signal stability
• Dual-scan-speed quadrupole operation: selectable 10,000 Da/sec (standard) or 20,000 Da/sec (high-speed) for compatibility with UHPLC gradients and narrow peak elution
• Integrated tuning and calibration using perfluorotributylamine (PFTBA): automated mass axis calibration and sensitivity optimization executed via MassHunter software
• HED+EM (High-Energy Dynode + Electron Multiplier) detector providing >10⁶ linear dynamic range and sub-femtogram detection limits for standard compounds (e.g., reserpine)
• Quartz capillary inlet and conical sampling optics ensure efficient ion transfer and reduce contamination accumulation in the interface region
• Built-in system suitability checks—including peak shape assessment, retention time reproducibility, and mass accuracy verification—support GLP/GMP-compliant workflows
• Full compliance with FDA 21 CFR Part 11 requirements when configured with audit-trail-enabled MassHunter Workstation (vB.08.x or later)

Sample Compatibility & Compliance

The G6120A supports direct coupling to reversed-phase, HILIC, and ion-pairing LC methods using standard 2.1 mm or 4.6 mm ID columns. It accommodates flow rates from 0.05 to 2.0 mL/min without split or post-column dilution. Sample introduction is compatible with standard autosamplers (e.g., Agilent 1200 SL or ALS), including partial-loop and full-loop injection modes. All refurbished units undergo full functional validation per internal SOPs aligned with ISO/IEC 17025:2017 clause 5.9 (method validation) and ASTM E2631-19 (performance verification of LC/MS systems). Certificate of Reconditioning includes documented results for mass accuracy (±0.2 Da), retention time RSD (<0.5%), peak area repeatability (RSD <3% over 10 injections), and baseline noise (<500 counts at m/z 556). No OEM warranty remains active; however, hardware and firmware are verified against original Agilent specifications.

Software & Data Management

Operation and data acquisition are managed via Agilent MassHunter Workstation (licensed version B.08.0x or newer), installed on a dedicated Windows 10 Pro workstation. The software provides real-time chromatogram display, extracted ion chromatograms (XIC), SIM and full-scan acquisition, and customizable report templates. Raw data files (.d format) are stored in a hierarchical directory structure compliant with LIMS integration protocols. Audit trail functionality records all user actions—including method edits, data reprocessing, and calibration events—with timestamps, operator IDs, and IP addresses. Data integrity safeguards include write-protection of raw folders, electronic signatures for report approval, and encrypted database backups. Optional integration with OpenLab CDS enables centralized instrument control and compliance reporting across multi-vendor laboratory environments.

Applications

This system is routinely deployed in pharmaceutical impurity profiling (ICH Q3B), environmental contaminant screening (e.g., pesticides, PAHs), food safety testing (mycotoxins, veterinary drug residues), and natural product identification. Its SIM capability supports validated bioanalytical assays per USP and EMA Guideline on Bioanalytical Method Validation. In academic settings, the G6120A serves as an accessible platform for metabolomics pilot studies, reaction monitoring, and synthetic chemistry confirmation. The combination of Agilent 1200 HPLC’s gradient precision and the G6120A’s consistent mass axis stability ensures method transferability between refurbished and new-platform instruments—a critical requirement for laboratories scaling analytical capacity without capital-intensive procurement.

FAQ

Is the MassHunter software license included with the refurbished G6120A?
Yes—each unit ships with a perpetual, transferable MassHunter Workstation license (Quantitative or Qualitative edition, as specified), pre-installed and activated.
What documentation accompanies the instrument?
You receive a Certificate of Reconditioning, full system validation report (mass accuracy, sensitivity, reproducibility), electrical safety test record, and complete service history log.
Can this system be upgraded to support APCI or other ion sources?
The G6120A chassis supports optional APCI source retrofit (Agilent G1969A); compatibility must be confirmed during pre-purchase technical review.
Is remote diagnostics supported?
Yes—MassHunter includes secure remote access capability via Agilent Remote Connect, enabling real-time troubleshooting by certified field engineers.
Does the 6-month warranty cover vacuum pump maintenance?
Yes—the warranty covers labor and parts for all core components, including turbomolecular and rotary vane pumps, provided scheduled preventive maintenance logs are retained.