Agilent 7694 Headspace Sampler (Refurbished)

Overview

The Agilent 7694 Headspace Sampler is a precision-engineered, gas-phase sample introduction system designed for automated, reproducible analysis of volatile and semi-volatile organic compounds in solid, liquid, or polymer matrices. Operating on the principle of equilibrium headspace analysis, the instrument heats sealed sample vials to establish vapor-phase equilibrium between the sample matrix and its headspace; the equilibrated vapor is then transferred quantitatively to a gas chromatograph (GC) via pressurized pneumatic injection. As a legacy but highly reliable platform within Agilent’s GC accessories portfolio, the 7694 delivers robust thermal control, precise vial pressurization, and repeatable syringe-based vapor transfer—making it particularly suited for regulated QC environments where method transferability and long-term operational stability are critical.

Key Features

• Thermally stable oven with programmable temperature range from ambient +10 °C to 300 °C, enabling optimization for diverse analyte volatilities and matrix types.
• Independent vial heating and transfer line temperature control ensures minimal condensation and carryover during vapor transport.
• Automated sequence operation supporting up to 48 standard 10–20 mL headspace vials per run, with customizable equilibration time, pressurization pressure, and injection volume parameters.
• Integrated pressure-balanced sampling mechanism minimizes vial over-pressurization and improves quantitative accuracy across wide concentration ranges.
• Refurbishment includes full mechanical inspection, replacement of critical wear components (septum, O-rings, syringe seals), calibration verification against NIST-traceable standards, and functional validation using certified reference materials (e.g., benzene/toluene/ethylbenzene/xylene mixtures in aqueous matrix).
• Compliant with GLP documentation requirements: full refurbishment log, performance test report, and instrument-specific calibration certificate provided with delivery.

Sample Compatibility & Compliance

The Agilent 7694 supports standard crimp-top or screw-cap headspace vials (10 mL and 20 mL formats) and accommodates a broad range of sample types—including pharmaceutical formulations, environmental water samples, food extracts, polymers, and forensic evidence. It is routinely deployed in applications aligned with ASTM D6866 (biobased content), USP (residual solvents), and EPA Method 502.2 (volatile halogenated hydrocarbons). All refurbished units undergo compliance verification for consistent adherence to ISO 17025 clause 6.4 (equipment suitability) and meet baseline requirements for FDA 21 CFR Part 11 readiness when integrated with compliant GC data systems.

Software & Data Management

While the 7694 operates as a standalone hardware controller with front-panel programming, it is fully compatible with Agilent ChemStation (G1701DA/G1701EA) and OpenLab CDS software suites. Sequence methods—including vial position mapping, temperature ramps, equilibration dwell times, and injection cycles—are defined and executed via host GC software. Audit trails, electronic signatures, and raw data integrity are maintained through the host CDS environment. Refurbished units include verified firmware version A.03.02 (or later), ensuring compatibility with modern Windows OS platforms and supporting secure network integration in multi-instrument laboratories.

Applications

• Residual solvent analysis in active pharmaceutical ingredients (APIs) and final drug products per ICH Q3C guidelines.
• Volatile organic compound (VOC) profiling in drinking water, wastewater, and soil leachates per EPA and ISO standards.
• Flavor and fragrance compound quantification in beverages, dairy, and confectionery products.
• Monomer and catalyst residue testing in polymer manufacturing quality control.
• Forensic toxicology screening for ethanol, acetone, and other volatile biomarkers in blood and tissue homogenates.

FAQ

Is this unit compatible with non-Agilent GC systems?
Yes—the 7694 features industry-standard TTL and analog I/O interfaces, allowing integration with Thermo Fisher, Shimadzu, and PerkinElmer GC platforms via appropriate trigger cabling and method synchronization protocols.
What documentation accompanies the refurbished instrument?
Each unit ships with a comprehensive refurbishment dossier: calibration certificate, functional test report (including temperature accuracy, pressure stability, and injection repeatability data), firmware verification log, and safety compliance statement.
Can the 7694 be upgraded to support dynamic headspace or purge-and-trap configurations?
No—the 7694 is a dedicated static equilibrium headspace sampler. Dynamic headspace functionality requires a separate purge-and-trap system (e.g., Agilent 40/50 series) or third-party modular add-ons not supported by original design specifications.
Does the 6-month warranty cover labor and parts globally?
The warranty covers all parts and labor for defects in materials or workmanship under normal laboratory use. On-site service is available in North America and Europe; remote diagnostics and component-level repair support extend to APAC and LATAM regions via authorized partner networks.