TouchScience THS-20 Automated Static Headspace Sampler

Overview

The TouchScience THS-20 is a fully automated static headspace sampler engineered for precision, reproducibility, and seamless integration into regulated analytical laboratories. It operates on the principle of static headspace analysis—equilibrating volatile analytes between a liquid or solid sample matrix and the gas phase above it within a sealed vial, followed by quantitative transfer of the equilibrated vapor to a gas chromatograph (GC) or GC-mass spectrometer (GC-MS). Designed for routine high-throughput applications in environmental testing, pharmaceutical residual solvent analysis (per USP , ICH Q3C), food flavor profiling, clinical toxicology, and petrochemical quality control, the THS-20 delivers robust performance without requiring proprietary GC interfaces or vendor-specific firmware.

Key Features

• Fully automated 20-position sample carousel with programmable sequence execution, including vial agitation (optional), incubation time, equilibration temperature, pressurization, and loop/needle injection.
• Independent, PID-controlled heating zones: sample oven (ambient–200 °C, ±0.1 °C accuracy), valve block (ambient–220 °C), and transfer line (maintained at ≥ oven temperature to eliminate condensation).
• Inert, heated sampling pathway using SilcoNert®-passivated stainless steel needles and fused-silica-lined transfer tubing—ensuring minimal adsorption, carryover, or thermal degradation of reactive or polar volatiles (e.g., formaldehyde, acetaldehyde, low-molecular-weight alcohols).
• 7-inch high-resolution capacitive touchscreen HMI with real-time graphical interface: displays live status of each vial (temperature, pressure, equilibration progress), system diagnostics, and dynamic flow path visualization.
• Method-based operation with user-defined parameter sets stored locally; supports up to 99 methods with full versioning and timestamped modification logs.

Sample Compatibility & Compliance

The THS-20 accommodates standard 20 mL crimp-top headspace vials (with magnetic or screw caps) and is compatible with common septa materials (PTFE/silicone, butyl rubber). It meets essential requirements for GLP and GMP environments through its built-in audit trail functionality: all method parameters, run sequences, temperature setpoints, and operator actions are recorded with ISO 8601 timestamps and cannot be edited retroactively. While not pre-certified for FDA 21 CFR Part 11, the system architecture supports electronic signature implementation via external LIMS integration and provides raw log export (CSV/ASCII) for regulatory submission. The instrument complies with ASTM D7699 (Standard Practice for Headspace Analysis) and aligns with ISO 17025 clause 5.9.1 regarding equipment traceability and calibration verification.

Software & Data Management

No proprietary PC software is required for basic operation—the THS-20 functions autonomously via its embedded controller and touchscreen interface. For laboratory-wide deployment, it supports RS-232 and Ethernet (TCP/IP) communication protocols to synchronize start triggers, method downloads, and status reporting with major GC data systems (OpenLab CDS, Chromeleon, GCMSsolution, Empower). All method files and audit logs are stored on internal flash memory (16 GB) with automatic rollover and USB export capability. Log entries include operator ID (if configured), method name, vial position, actual vs. setpoint temperatures, equilibration time deviation, and injection success/failure flags—enabling root-cause analysis during OOS investigations.

Applications

• Pharmaceutical: Residual solvent quantification in active pharmaceutical ingredients (APIs) and excipients per ICH Q3C guidelines.
• Environmental: Determination of volatile organic compounds (VOCs) such as benzene, toluene, ethylbenzene, and xylenes (BTEX) in groundwater and soil extracts.
• Food & Beverage: Ethanol content in non-alcoholic beverages, flavor compound profiling in dairy and fermented products, and packaging migration studies.
• Clinical: Blood alcohol concentration (BAC) and volatile metabolite screening (e.g., acetone in diabetic ketoacidosis).
• Petrochemical: Hydrocarbon fingerprinting in fuels and lubricants, sulfur compound detection (e.g., mercaptans), and purity assessment of monomers.

FAQ

Is the THS-20 compatible with my existing Agilent 8890 GC?
Yes—the THS-20 uses standard GC trigger signals (TTL or contact closure) and configurable injection timing; no hardware adapter is needed.
Can I perform dynamic headspace (purge-and-trap) with this instrument?
No—the THS-20 is designed exclusively for static headspace analysis; it does not support carrier gas purging or trap desorption modules.
What maintenance intervals are recommended for the sampling needle and transfer line?
Inspect and clean the needle weekly with methanol and nitrogen purge; replace the SilcoNert® needle every 6–12 months depending on sample matrix corrosivity and daily throughput.
Does the system support method validation documentation packages?
While the THS-20 does not generate IQ/OQ/PQ reports natively, its audit trail, temperature calibration records, and repeatability data (RSD ≤ 1.5% for BTEX at 10 ppm) provide foundational evidence for validation protocols.
How is temperature uniformity verified across the 20-position oven?
A certified NIST-traceable PT100 probe can be inserted into representative vial positions during qualification; TouchScience provides a temperature mapping template and acceptance criteria (±0.5 °C max deviation across all positions at 80 °C).