APL APL-TD-2 Single-Tube Automated Two-Stage Thermal Desorber
| Brand | APL |
|---|---|
| Origin | Sichuan, China |
| Manufacturer Type | Manufacturer |
| Product Category | Domestic |
| Model | APL-TD-2 |
| Instrument Type | Two-Stage Thermal Desorber, Thermal Desorber |
| Desorption Temperature Range | Ambient to 400 °C |
| Cold Trap Temperature Range | −35 °C |
| Desorption Recovery Rate | >98% |
| Sample Position Count | 1 |
Overview
The APL APL-TD-2 Single-Tube Automated Two-Stage Thermal Desorber is a precision-engineered thermal desorption system designed for quantitative analysis of volatile and semi-volatile organic compounds (VOCs and SVOCs) in environmental, indoor air, and industrial emission samples. It operates on the principle of two-stage thermal desorption — first-stage desorption transfers analytes from the sorbent tube into a cryogenically focused cold trap; second-stage flash desorption rapidly volatilizes the trapped analytes into a narrow, high-concentration band for injection into gas chromatography (GC) or GC–MS systems. This architecture ensures high sensitivity, excellent peak shape, and minimal breakthrough or carryover. The instrument is fully automated, integrating programmable temperature control, motorized six-port valve sequencing, and synchronized signal output to trigger GC oven ramping and data acquisition — enabling unattended operation compliant with method-driven analytical workflows.
Key Features
- Two-stage thermal desorption architecture with independent temperature control for primary desorption zone (ambient to 400 °C), cold trap (−35 °C via Peltier cooling), and secondary flash desorption (>3000 °C/min heating rate)
- Motorized six-port valve and solenoid valve manifold for precise, repeatable sequence execution of desorption, transfer, backflush, and trap reconditioning
- Touchscreen HMI interface supporting intuitive method creation, storage, recall, and real-time visualization of valve positions, heater status, and timing events
- Independent thermal zones: adsorbent tube furnace, valve block (ambient to 220 °C), and transfer line (ambient to 260 °C), each with ±1 °C temperature stability
- Simple-Lock™ mechanical coupling system enables secure, leak-tight sorbent tube mounting and removal in under 2 seconds without tools
- Integrated standard 89 mm × 6.4 mm OD stainless steel or quartz sorbent tubes rated to 420 °C; sealed with PTFE caps for extended sample integrity
- Programmable backflush flow (0–600 mL/min) and calibrated simulation sampling at 100 mL/min for calibration curve generation
- Universal GC interface: compatible with all major GC inlet types (split/splitless, PTV, cold on-column) via standardized needle geometry
Sample Compatibility & Compliance
The APL-TD-2 supports standard 1/4″ OD sorbent tubes packed with common media including Tenax TA, Carbopack B/C, Carboxen, and graphitized carbon blacks. It accommodates single-tube formats used in regulatory monitoring protocols requiring trace-level VOC quantification in ambient air, indoor environments, vehicle cabins, and stack emissions. The system meets the hardware and operational requirements specified in multiple Chinese national and environmental standards, including HJ 644–2013 (VOCs in ambient air by TD-GC–MS), HJ 583–2010 (benzene homologues by TD-GC), HJ 734–2014 (VOCs in stationary source emissions), GB/T 18883–2002 (indoor air quality), and GB 50325–2010 (civil building IAQ control). Its design facilitates audit-ready operation under GLP-aligned laboratory practices.
Software & Data Management
Method parameters — including desorption time, trap hold duration, flash temperature ramp, backflush volume, and GC trigger delay — are stored as discrete, timestamped protocol files. All temperature setpoints, valve actuation timestamps, and system status logs are recorded internally and exportable in CSV format. While the instrument does not embed proprietary chromatography software, its TTL-compatible synchronization output ensures seamless integration with third-party GC data systems (e.g., Agilent OpenLab, Thermo Chromeleon, Shimadzu GC Solutions). Audit trail functionality supports basic traceability; for full 21 CFR Part 11 compliance, integration with validated LIMS or chromatography data systems is recommended.
Applications
- Regulatory monitoring of benzene, toluene, ethylbenzene, xylenes (BTEX), C2–C12 aliphatics, and oxygenated VOCs in ambient and workplace air
- Indoor air quality assessment per GB/T 18883–2002 and HJ/T 400–2007, including formaldehyde precursors and terpene derivatives
- Method validation and calibration curve preparation using certified reference standards and dynamic dilution
- Analysis of off-gassing from building materials, automotive interiors, and consumer products
- Support for EPA TO-17 and ISO 16017-1 workflows when paired with appropriate sorbent tubes and GC–MS detection
FAQ
What sorbent tube dimensions and materials are supported?
The APL-TD-2 accepts standard 89 mm length × 6.4 mm OD stainless steel or quartz tubes, compatible with common packing materials including Tenax TA, Carbopack series, and Carboxen.
Does the system require external cryogenic coolant?
No — the cold trap uses solid-state Peltier cooling to achieve −35 °C without liquid nitrogen or compressed air.
Can the instrument be integrated with non-APL gas chromatographs?
Yes — it provides universal GC inlet compatibility via adjustable needle depth and TTL synchronization signals for external instrument triggering.
Is method programming limited to preset templates?
No — users define custom time-sequence methods via the touchscreen interface, with full control over temperatures, flow rates, valve timing, and event triggers.
What maintenance is required for long-term reliability?
Routine tasks include periodic inspection of O-rings, cleaning of the transfer line, verification of cold trap performance, and replacement of septa and tubing per usage frequency — no consumables beyond standard GC-grade components are required.
