Acrichi DK802T Fully Automated Static Headspace Sampler

Overview

The Acrichi DK802T Fully Automated Static Headspace Sampler is an engineered solution for reproducible, unattended volatile compound analysis in conjunction with gas chromatography (GC). It operates on the principle of static headspace equilibrium—where a sealed sample vial is heated to thermally partition volatile analytes between the liquid/solid matrix and the vapor phase above it. Once equilibrium is reached, a precisely metered volume of the equilibrated headspace gas is transferred via a thermostatted six-port valve and heated transfer line directly into the GC injector. This method eliminates solvent interference, minimizes matrix effects, and delivers high sensitivity for trace-level volatiles—including residual solvents, environmental contaminants, flavor compounds, and forensic analytes—without requiring derivatization or extraction.

Key Features

• Fully automated operation with one-touch start-up and unattended batch processing for up to 20 samples
• Triple-zone independent temperature control: sample oven (ambient–260 °C), six-port valve (ambient–220 °C), and transfer line (ambient–220 °C), all maintained within ±0.1 °C accuracy
• Heated valve manifold and transfer pathway fully enclosed in a thermal insulation chamber—eliminating cold spots and preventing condensation or adsorption losses
• Customizable 1 mL quantitative loop (with optional volume configurations) integrated into a low-dead-volume six-port valve system for precise, repeatable injection volumes
• Intelligent heating strategies including overlap mode (pre-heating next vial during current analysis) and time-gradient mode (stepwise ramping of oven temperature across sequence)
• Integrated leak detection algorithm with real-time pneumatic monitoring and audible/visual fault alerts
• 10 user-editable, saveable, and recallable methods stored onboard; supports synchronization with external GC systems via TTL or contact closure triggers
• Capacitive touchscreen interface with intuitive navigation, real-time status display, and embedded diagnostics

Sample Compatibility & Compliance

The DK802T accommodates standard crimp-top or screw-cap headspace vials (10 mL and 20 mL formats), compatible with widely adopted septa materials (e.g., PTFE/silicone) and certified vial brands used in regulated environments. Its design aligns with core principles outlined in ASTM D3792 (residual solvents in polymers), USP (residual solvents in pharmaceuticals), and ISO 11843-7 (detection capability for headspace-GC). While not pre-certified for 21 CFR Part 11, the system supports audit-trail-ready operation when paired with compliant GC data systems—enabling full traceability of method parameters, run logs, and calibration events required under GLP and GMP frameworks.

Software & Data Management

The onboard firmware provides local method development, sequence scheduling, and real-time monitoring without dependency on external PCs. All method files—including temperature ramps, equilibration times, loop fill/flush cycles, and valve timing—are stored internally with timestamped version history. Raw event logs (e.g., valve actuation, temperature deviations, leak detection events) are exportable via USB in CSV format. For laboratory informatics integration, the DK802T offers RS-232 and digital I/O interfaces to synchronize with third-party chromatography data systems (CDS), enabling automatic run initiation, status feedback, and metadata tagging within LIMS workflows.

Applications

• Pharmaceutical quality control: residual solvent quantification per ICH Q3C guidelines
• Food and beverage safety: detection of ethanol, acetaldehyde, ethyl acetate, and off-flavor volatiles
• Polymer and packaging analysis: migration testing of monomers, plasticizers, and catalyst residues
• Environmental testing: volatile organic compounds (VOCs) in aqueous soil extracts or wastewater
• Clinical toxicology: blood alcohol concentration (BAC) and volatile metabolite screening
• Forensic chemistry: ignitable liquid residue (ILR) identification in arson investigations

FAQ

What vial formats does the DK802T support?
The instrument accepts standard 10 mL and 20 mL headspace vials with crimp-seal or screw-cap closures.
Can the quantitative loop volume be modified?
Yes—the default 1 mL loop is field-replaceable; alternative loop sizes (e.g., 0.5 mL, 2 mL) can be installed per application requirements.
Does the system support method validation protocols?
It provides stable thermal control (±0.1 °C), documented repeatability (<1.5% RSD), and deterministic valve timing—key parameters necessary for precision and intermediate precision assessment per ICH Q2(R2).
Is remote monitoring or network connectivity available?
No built-in Ethernet or Wi-Fi; however, serial (RS-232) and hardware trigger I/O enable integration with centralized lab automation platforms.
How is carryover minimized between runs?
The system implements programmable loop and transfer line bake-out cycles, along with configurable flush volumes and purge durations—validated using blank vial injections.