Zhonghuipu JX-1 Manual Thermal Desorber

Overview

The Zhonghuipu JX-1 Manual Thermal Desorber is a single-stage, benchtop thermal desorption unit engineered for precise, reproducible release of volatile and semi-volatile organic compounds (VOCs and SVOCs) from sorbent-packed tubes. Unlike automated or cryo-focused systems, the JX-1 employs resistive heating and direct gas-phase transfer—eliminating cold traps, valves, and complex pneumatic routing. Its design centers on compliance with Chinese occupational health standards (e.g., GBZ/T series), where manual, traceable, and method-locked workflows are required for workplace air monitoring. The instrument operates on the principle of controlled thermal desorption: analytes adsorbed onto sorbent media (e.g., Tenax TA, Carbopack B/C, or multi-bed traps) are thermally liberated under inert nitrogen flow, then transferred quantitatively into a gas-tight 100 mL glass syringe—ensuring zero dead volume and minimal analyte loss or degradation.

Key Features

• Manual, operator-controlled workflow—ideal for laboratories requiring full procedural transparency and audit-ready documentation per GLP/GMP-aligned practices.
• High-stability temperature control system with ±0.5 °C accuracy across the full 25–400 °C range, validated using NIST-traceable reference thermocouples.
• Integrated precision rotameter for adjustable carrier gas flow (16–160 mL/min), calibrated for nitrogen at standard temperature and pressure (STP).
• Entire gas pathway constructed from electropolished and passivated 316 stainless steel tubing, minimizing surface adsorption and metal-catalyzed decomposition.
• PTFE-sealed fittings and high-temperature-compatible O-rings ensure leak-tight integrity up to 400 °C and eliminate background contamination from elastomer outgassing.
• Direct coupling interface accepts standard 6 mm OD thermal desorption tubes (>120 mm length), enabling compatibility with widely used sorbent configurations in industrial hygiene sampling.

Sample Compatibility & Compliance

The JX-1 supports desorption of target analytes from common sorbent tubes used in workplace air sampling, including single-bed (e.g., Tenax TA for C₆–C₁₄ aromatics and aliphatics) and dual/multi-bed configurations (e.g., Carbopack B + Carbopack C for extended volatility range). It is explicitly designed and verified for use with national occupational exposure limit (OEL) methodologies, including but not limited to:

• GBZ/T 300.62–2017 — Determination of solvent gasoline, LPG, raffinate, and turpentine in workplace air
• GBZ/T 160.38–2004 — Determination of aliphatic hydrocarbons in workplace air
• GBZ/T 160.52–2007 — Determination of aliphatic ethers in workplace air

While not an FDA 21 CFR Part 11–compliant system due to its manual operation, the JX-1 supports full traceability when integrated into laboratory notebooks, SOP-driven workflows, and ISO/IEC 17025-accredited testing environments where instrument logs, calibration records, and analyst signatures constitute formal data governance.

Software & Data Management

The JX-1 operates without embedded firmware or proprietary software—reflecting its role as a dedicated, hardware-only desorption module. All operational parameters (temperature setpoint, dwell time, flow rate) are recorded manually by the analyst in standardized log sheets aligned with GBZ/T reporting templates. This analog control architecture ensures long-term stability, eliminates cybersecurity vulnerabilities, and simplifies validation for regulated industrial hygiene labs. For laboratories implementing electronic lab notebooks (ELN), the JX-1 integrates seamlessly via structured metadata entry (e.g., tube ID, batch number, desorption timestamp, ambient conditions) without requiring device-level connectivity.

Applications

• Workplace air quality assessment for VOCs in manufacturing, petrochemical, paint, printing, and adhesive application facilities
• Occupational exposure monitoring per Chinese national standards and enterprise EHS programs
• Method development and verification for thermal desorption–gas chromatography (TD–GC) workflows where manual transfer to syringe-based injection is preferred
• Calibration standard preparation via dynamic spiking of sorbent tubes followed by quantitative recovery assessment
• Educational and training use in analytical chemistry curricula focusing on sorptive sampling fundamentals and desorption physics

FAQ

Is the JX-1 compatible with GC autosamplers?

No—the JX-1 delivers desorbed analytes directly into a 100 mL gas-tight syringe; it does not feature a GC interface or split/splitless injection port. Syringe-based manual injection into GC systems is required.
Can I use helium instead of nitrogen as the desorption gas?

Yes, provided helium purity is ≥99.999% and system compatibility with He’s lower viscosity and higher thermal conductivity is confirmed; however, nitrogen remains the recommended carrier per GBZ/T methods.
What maintenance is required for long-term reliability?

Annual verification of temperature sensor calibration and rotameter flow accuracy is recommended; stainless steel lines require no routine cleaning unless exposed to highly reactive or particulate-laden samples.
Does the JX-1 support programmed temperature ramping?

No—it provides only isothermal desorption at a user-selected steady-state temperature; ramped desorption requires external controller integration not included with the base unit.
How is desorption efficiency validated?

Efficiency ≥85% is determined per GBZ/T 300.1–2017 Annex A using certified reference standards spiked onto sorbent tubes, followed by recovery analysis via GC–FID or GC–MS.