Fully Automatic Secondary Thermal Desorption Instrument, JX-7AT (CAT#: STEM-AIAE-0541-ZJF)

The JX-7AT Thermal Desorption Analyzer is a fully automatic dual-stage (cold trap) thermal desorption instrument with 24 sample positions. It utilizes semiconductor cooling, with the cold trap temperature capable of reaching as low as -35°C (depending on experimental environmental temperature). The injection valve system is motor-driven, and the needle penetration is pneumatic. It features standard sample simulation sampling functionality. The enrichment, injection, and other processes are fully automated. It can be used in conjunction with domestic and imported gas chromatographs and is suitable for applications in environmental monitoring. It is capable of determining volatile and semi-volatile organic compounds.

Primary Desorption Heating Range: 40℃—400℃, Temperature Control Accuracy 1℃
Injection Valve Heating Range: 40℃—240℃, Temperature Control Accuracy 1℃
Sample Transfer Tube Heating Range: 40℃—240℃, Temperature Control Accuracy 1℃
Cold Trap Cooling Range: -35℃— -5℃
Secondary Desorption Temperature Range: -35℃—450℃
Secondary Desorption Heating Rate: >70℃/s
Sample Tube Specifications: Diameter 1/4”, Length 3.5”
Sample Positions: 24 positions
Enrichment Time: 0-60min
Injection Time: 0-10min
Simulated Sampling Time: 0-60min
Simulated Sampling Flow Rate: 0-200ml/min
RSD: ≤2.5% (0.05μg benzene in methanol)
Power: Peak 500W

Utilizes semiconductor refrigeration to save operating costs.
Secondary analysis ramp-up rate >70°C/s, reaching 450°C, with peak width <3s.
All gas lines are made of passivated and polished 316 stainless steel, with sealing rings crafted from PTFE material, providing high temperature resistance and no volatile emissions.
Heating gas lines use imported high-inertness deactivated stainless steel, with seals made of PTFE material, offering high temperature resistance and no volatile emissions.
Precision high-temperature resistant injection valves are used in the heating valve box, with no dead volume. Injection valves are motor-driven, requiring no external gas drive, providing convenient usage.
Integrated design of the heating valve box and heating gas path reduces intermediate links, minimizing the problem of low resolution caused by dead volume.
Through calculation of the diameter of the analysis tube and gas path, optimal variable diameter joints are designed, minimizing dead volume at the connection points of the analysis tube and gas path.
Features standard sample simulation sampling functionality.

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