Zhongyi Yusheng ATDS-20A Fully Automated Thermal Desorber

Overview

The Zhongyi Yusheng ATDS-20A Fully Automated Thermal Desorber is an engineered solution for high-throughput, trace-level volatile organic compound (VOC) and semi-volatile organic compound (SVOC) analysis in environmental, occupational health, indoor air quality, and materials testing laboratories. Based on dual-stage thermal desorption principle, the ATDS-20A thermally releases analytes adsorbed onto sorbent tubes—such as Tenax®, Carbopack™, or multi-bed configurations—under precisely controlled inert gas flow and temperature ramping. The desorbed compounds are then refocused cryogenically or via cold trap (optional configuration), followed by rapid transfer into a coupled gas chromatograph (GC) or gas chromatography–mass spectrometer (GC-MS) for separation and detection. This two-step process significantly enhances sensitivity, reduces matrix interference, and improves quantitative reproducibility compared to single-stage desorption—particularly critical for low-concentration analytes in complex matrices such as ambient air, workplace breathing zone samples, building materials emissions, and automotive cabin air.

Key Features

• Fully automated 20-position sample carousel enabling unattended batch processing of up to 20 sorbent tubes per sequence
• Three independently programmable heating zones: desorption oven (ambient to 400 °C), transfer line (ambient to 350 °C), and injection valve (ambient to 300 °C), each with ±0.5 °C temperature stability
• Integrated self-diagnostic startup routine including mechanical positioning verification, thermal calibration check, and system pressure validation
• Time-segmented method programming supporting sequential operations: tube conditioning, primary desorption, cold trap focusing (if equipped), secondary desorption, GC injection, and post-run purge/cool-down
• Dual-mode desorption capability: configurable for both ambient-temperature secondary desorption (for thermally labile compounds) and cryogenic secondary desorption (for enhanced sensitivity and peak sharpness)
• Automatic post-desorption tube reactivation protocol with programmable flow, temperature, and duration parameters
• Zero-cross contamination design featuring active back-flush of transfer line and injection valve using carrier gas, synchronized with each sample cycle
• Universal GC/GC-MS synchronization interface compatible with Agilent, Thermo Fisher, Shimadzu, PerkinElmer, and domestic GC platforms via TTL or contact closure signals
• Optional quartz-lined or fused silica transfer tubing for improved inertness during analysis of reactive or polar VOCs (e.g., aldehydes, acids, amines)

Sample Compatibility & Compliance

The ATDS-20A supports standard 6 mm OD × 89 mm (3.5″) stainless steel or glass sorbent tubes, including single-bed (e.g., Tenax TA), dual-bed (e.g., Carbopack B + Carbopack C), and triple-bed configurations. It accommodates both diffusion- and pump-sampled tubes per EPA TO-17 and ISO 16017-1 guidelines. The instrument’s operational parameters and method templates align directly with Chinese national and environmental standards, including but not limited to HJ 583–2010 (benzene homologues in ambient air), HJ 644–2013 (VOCs by TD-GC-MS), HJ 734–2014 (stationary source emissions), and GB/T 18883–2022 (indoor air quality). Its architecture supports audit-ready data integrity when integrated with GLP-compliant chromatography data systems (CDS), and method files include embedded metadata required for regulatory submissions under CNAS-accredited laboratory workflows.

Software & Data Management

Controlled via a 10.1-inch capacitive touchscreen interface running embedded Linux-based firmware, the ATDS-20A provides intuitive method development, real-time status visualization (including temperature profiles, valve actuation timing, and pressure monitoring), and event logging with time-stamped entries. All method parameters—including ramp rates, hold times, gas flows (He or N₂), and cooling durations—are fully exportable in CSV format. Audit trail functionality records operator login, method modification history, run initiation/completion timestamps, and system error events—supporting compliance with GB/T 27025–2019 (equivalent to ISO/IEC 17025) documentation requirements. Remote monitoring is enabled via Ethernet port; optional OPC UA integration allows centralized fleet management in multi-instrument laboratories.

Applications

• Environmental monitoring: Ambient air, stack emissions, landfill fugitive gases
• Indoor air quality assessment: Residential, office, school, and hospital environments per GB 50325–2020 and GB/T 18883–2022
• Occupational hygiene: Workplace air sampling for benzene, toluene, xylene, styrene, gasoline vapors, and other regulated toxicants (GBZ/T 300 series)
• Materials emission testing: Carpets, adhesives, coatings, synthetic turf (GB 36246–2018), and furniture composites
• Automotive interior air: VOC and carbonyl compound profiling per HJ/T 400–2007
• Forensic and failure analysis: Residual solvent identification in pharmaceutical packaging or polymer manufacturing

FAQ

Does the ATDS-20A support both primary and secondary thermal desorption?
Yes—the instrument is configured as a dual-stage thermal desorber and supports both single- and two-step desorption protocols. Secondary desorption can be performed at ambient temperature or with optional cryofocusing for enhanced sensitivity.
Can the ATDS-20A be used with GC-MS systems from non-Chinese manufacturers?
Yes—it includes universal hardware triggers (TTL and dry-contact) and configurable timing delays to synchronize seamlessly with Agilent, Thermo Fisher, Shimadzu, and PerkinElmer GC-MS platforms.
Is tube reactivation (baking) automated?
Yes—users can define custom reactivation methods, including flow rate, temperature ramp, hold time, and cooling phase, which execute automatically after each desorption cycle.
What safety features are included?
The system incorporates overtemperature protection for all heated zones, real-time pressure monitoring with automatic shutdown on abnormal readings, and interlocked access doors that halt operation upon opening.
Does the ATDS-20A meet ISO/IEC 17025 traceability requirements?
While the instrument itself does not carry formal accreditation, its firmware-supported audit trail, method version control, electronic signature-capable user authentication, and calibrated temperature/pressure subsystems enable full traceability within an ISO/IEC 17025-compliant quality management system.