Sanpu ATDS-20A Fully Automated Two-Stage Thermal Desorber with Cryogenic Trap

Overview

The Sanpu ATDS-20A is a fully automated two-stage thermal desorber engineered for high-fidelity, quantitative analysis of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) in environmental, industrial hygiene, and indoor air matrices. It operates on the principle of solid-phase adsorption followed by sequential thermal desorption—first stage desorption releases analytes from the sorbent tube into a cryogenically focused trap; second stage desorption rapidly injects the concentrated analyte band into the gas chromatograph (GC) or GC–MS inlet via a heated transfer line and six-port valve. This two-stage architecture, coupled with precise electronic cooling (down to −35 °C), ensures narrow bandwidth injection, minimized band broadening, and enhanced sensitivity—critical for trace-level VOC quantification per EPA TO-17, ISO 16017-1, and HJ 734–2014 compliance requirements.

Key Features

• Fully automated 20-position sample carousel with self-calibrating tray positioning and real-time status animation via 7-inch capacitive touchscreen interface.
• Independent four-zone temperature control: primary desorption furnace (ambient–450 °C), secondary desorption zone (100–450 °C), valve oven (ambient–300 °C), and transfer line (ambient–300 °C), all adjustable in 1 °C increments.
• Integrated Peltier-based cryogenic trap enabling precise low-temperature focusing (−35 °C to ambient) without liquid nitrogen or mechanical refrigeration.
• Programmable multi-step sequence: desorption → carrier gas purge → cold trap focusing → rapid thermal desorption → GC injection → post-injection valve and transfer line backflush (0–100 mL/min, continuously adjustable).
• Built-in tube activation protocol with programmable heating, purging, and cooling cycles to ensure consistent sorbent conditioning prior to sampling.
• Simulated sampling mode for direct calibration curve generation using standard vapor pulses, eliminating manual spiking steps.
• GC synchronization capability: triggers external GC start and data acquisition software (e.g., BF-2002, Chromeleon, OpenLab) via TTL or Ethernet command.
• Modular configuration support: field-upgradable to include ambient- or cryo-enhanced secondary desorption modules based on application-specific volatility profiles.

Sample Compatibility & Compliance

The ATDS-20A accepts standard 1/4″ OD × 3.5″ stainless steel or quartz sorbent tubes packed with Tenax TA, Carbopack B/C, or multi-bed sorbents (e.g., Tenax GR + Carboxen 1000 + Carbopack C), conforming to ASTM D6196 and ISO 16017-1 tube specifications. Its validated performance meets regulatory requirements for method-defined applications including HJ 644–2013 (ambient air VOCs via TD-GC/MS), HJ 583–2010 (benzene series in ambient air), HJ 734–2014 (VOCs from stationary source emissions), GB/T 18883–2002 (indoor air quality), and GB 50325–2020 (civil building indoor pollution control). System diagnostics, method audit trails, and parameter logging support GLP/GMP-aligned workflows and are compatible with 21 CFR Part 11-compliant data systems when integrated with validated chromatography data handling platforms.

Software & Data Management

The embedded firmware supports full method programming—including temperature ramp rates (>3000 °C/min for secondary desorption), timing sequences, flow control, and interlock logic—with non-volatile storage for ≥100 user-defined methods. All operational parameters, run logs, error codes, and calibration events are timestamped and exportable as CSV files. When interfaced with third-party chromatography data systems (CDS), the ATDS-20A transmits instrument status and trigger signals via RS-232, USB virtual COM, or Ethernet TCP/IP protocols. Raw desorption event metadata (e.g., trap temperature stability, valve actuation timing, pressure drop across tube) can be archived alongside GC peak data to support full analytical traceability and root-cause investigation during method validation or regulatory audits.

Applications

The ATDS-20A serves as a core front-end for trace VOC analysis across environmental monitoring (stack emissions, ambient air, soil vapor), occupational health (workplace air sampling per NIOSH 1501/1600), product safety testing (automotive cabin air, building materials per ISO 12219-3), and food packaging migration studies. Its robust architecture enables reliable analysis of C₂–C₁₆ hydrocarbons, oxygenates (e.g., aldehydes, ketones), halogenated compounds (e.g., chloromethanes, chloroform), and aromatic species (e.g., benzene, toluene, xylenes) at sub-pptr (ng/m³) levels. The system is routinely deployed in accredited laboratories performing testing under CNAS-CL01 (equivalent to ISO/IEC 17025) and supports method transfer between instruments due to standardized thermal profiling and pneumatic control algorithms.

FAQ

What sorbent tube formats are supported?

Standard 1/4″ OD × 3.5″ tubes compliant with ASTM D6196 and ISO 16017-1; custom-length or quartz-lined tubes may be accommodated with optional adapters.
Does the system meet U.S. EPA or EU regulatory requirements?

Yes—method performance aligns with EPA TO-17 for ambient air and ISO 16017-1 for indoor air; full compliance documentation available upon request for method validation packages.
Can the ATDS-20A be integrated with Agilent, Thermo, or Shimadzu GC systems?

Yes—dedicated hardware interfaces and TTL/Ethernet trigger protocols are provided for seamless synchronization with all major GC and GC–MS platforms.
Is remote monitoring or networked operation supported?

Ethernet connectivity enables remote method upload, real-time status viewing, and alarm notification via standard SNMP or HTTP-based APIs.
What maintenance intervals are recommended for routine operation?

Valve seal inspection every 500 runs; trap cleaning every 1,000 injections; annual calibration verification of all temperature zones and flow controllers per ISO/IEC 17025 guidelines.