Beifen Sanpu TDS-II 100 mL Syringe Thermal Desorber

Overview

The Beifen Sanpu TDS-II 100 mL Syringe Thermal Desorber is a dedicated sample pre-concentration and thermal desorption device engineered for compliance with occupational hygiene monitoring protocols in workplace air analysis. It operates on the principle of controlled thermal desorption—where volatile and semi-volatile organic compounds (VOCs and SVOCs) adsorbed onto solid sorbent tubes (e.g., Tenax TA, Carbopack B/C, or activated carbon) are thermally released into a 100 mL gas-tight glass syringe under inert carrier gas flow. The desorbed analytes are then manually transferred via the heated syringe into a gas chromatograph (GC) for separation and quantification. This two-step process—thermal desorption followed by manual syringe injection—is specifically aligned with Chinese national occupational health standards (GBZ/T 300 series), including methods for acetone, formaldehyde, benzene, TVOC, chlorinated ethylenes, acrylates, and nitro-compounds. Unlike automated cold-trap desorbers, the TDS-II implements a direct-transfer architecture without cryofocusing, making it a cost-effective, robust solution for laboratories performing routine GC-based air quality testing under regulated manual-injection workflows.

Key Features

• Integrated dual-zone temperature control: Independent heating modules for the desorption furnace (up to 400 °C) and the 100 mL syringe heater (up to 100 °C), each with ±0.5 °C stability and 1 °C programmable resolution.
• Optimized desorption geometry: Designed for standard 6 mm OD (¼″) sorbent tubes of variable length—ensuring minimal dead volume and reproducible analyte transfer.
• High recovery performance: Achieves ≥85% thermal desorption efficiency across a broad range of target analytes, validated per GBZ/T 300.127–2017 and GB 50325–2006 Annex C protocols.
• Manual syringe handling interface: Accommodates standard 100 mL gas-tight glass syringes with integrated heating to prevent condensation and ensure quantitative transfer.
• Compact benchtop design: Dimensions of 390 × 170 × 360 mm (H × W × D); weight ≈ 9 kg; power consumption ≈ 500 W—suitable for shared lab environments and mobile field labs.
• User-centric operation: Simplified tube loading/unloading mechanism and intuitive dual digital temperature controllers reduce operator training time and minimize procedural error.

Sample Compatibility & Compliance

The TDS-II supports widely used sorbent media—including Tenax TA, Carbopack™ series, activated carbon, and silica gel—enabling method flexibility for diverse analyte classes (aldehydes, ketones, halogenated hydrocarbons, aromatic hydrocarbons, esters, and nitrated explosives). It is explicitly referenced in multiple GBZ/T 300 subparts (e.g., Parts 62, 77, 78, 80, 84, 99, 127, 133, 159) for workplace air sampling and analysis. While not an automated system compliant with ASTM D6196 or ISO 16017-1, its operational parameters and validation data align with GLP-aligned manual thermal desorption workflows. When used with certified sorbent tubes and calibrated GC systems, the instrument supports data generation suitable for regulatory reporting under China’s occupational exposure limit (OEL) framework.

Software & Data Management

The TDS-II is a hardware-only, controller-based instrument with no embedded software or computer interface. Temperature setpoints and dwell times are configured locally via dual digital PID controllers with LED displays. As such, it does not generate electronic records, audit trails, or raw data files. Laboratories requiring 21 CFR Part 11 compliance must integrate external documentation practices—including manual logbooks, SOP-controlled calibration records, and traceable syringe calibration certificates—to maintain data integrity. Its simplicity ensures long-term reliability in environments where network connectivity or software maintenance is constrained.

Applications

• Occupational hygiene monitoring: Quantification of airborne VOCs in factories, chemical plants, printing facilities, and coating operations per GBZ/T 300 series.
• Indoor air quality (IAQ) assessment: Benzene and TVOC analysis in residential and commercial buildings per GB 50325–2006.
• Method development and validation: Ideal for labs establishing or verifying manual thermal desorption–GC protocols prior to upgrading to automated platforms.
• Educational and training use: Transparent mechanical design and manual workflow support hands-on instruction in sample preparation, desorption kinetics, and GC inlet dynamics.
• Cost-sensitive QC/QA labs: Enables high-recovery desorption using economical sorbent tubes (e.g., activated carbon) without cold-trap infrastructure.

FAQ

Is the TDS-II compatible with all gas chromatographs?

Yes—provided the GC inlet accepts manual liquid-phase injection via a 100 mL syringe and supports split/splitless modes with appropriate liner selection.

Does it support automated sample introduction?

No—the TDS-II requires manual syringe withdrawal and injection; it is not equipped with autosampler integration or pneumatic actuation.

What is the recommended carrier gas for desorption?

High-purity helium or nitrogen at regulated flow rates between 10–200 mL/min, with flow stability <0.1% over time.

Can it be used for quantitative analysis of polar compounds like formaldehyde?

Yes—when paired with derivatization-compatible sorbents (e.g., DNPH-coated tubes) and validated GC methods per GBZ/T 300.99–2017.

Is routine calibration required?

Temperature calibration of both furnaces should be verified annually using NIST-traceable thermocouple probes; syringe volume calibration is recommended before each analytical batch.