Zhonghuipu PT-2 Purge and Trap Autosampler

Overview

The Zhonghuipu PT-2 Purge and Trap Autosampler is a benchtop, single-position thermal desorption system engineered for trace-level volatile organic compound (VOC) analysis in aqueous and solid environmental matrices. It operates on the principle of dynamic headspace extraction: inert gas purging volatilizes target analytes from liquid or soil samples into a carrier stream, which transports them onto a sorbent-packed trap. Following moisture removal and trap concentration, rapid thermal desorption injects the analytes—intact and focused—into a coupled gas chromatograph (GC) or GC–mass spectrometer (GC–MS). Designed to meet stringent regulatory requirements, the PT-2 supports full compliance with major Chinese environmental standards including HJ 639-2012, HJ 686-2014, HJ 788-2016, HJ 605-2011, HJ 893-2017, HJ 977-2018, HJ 1020-2019, and GB/T 5750.8-2006. Its architecture mirrors operational logic and interface conventions used by leading international platforms (e.g., Tekmar, OI Analytical, CDS), enabling seamless method transfer and cross-platform workflow integration.

Key Features

• Integrated high-efficiency infrared heating module for sample purge tubes—enabling rapid, uniform heating (>50 °C/s) and improved analyte recovery sensitivity.
• Motor-driven mechanical actuation—no external pneumatic supply required—ensuring intrinsic safety, reduced maintenance, and precise positional repeatability.
• Dedicated foam suppression unit with programmable temperature control (ambient to 200 °C), automatically detecting and eliminating foam formation during aqueous purging to prevent line clogging and system contamination.
• Ultra-low-dead-volume 6-port valve configuration, fully heated (up to 200 °C standard; optional 330 °C), mounted within an insulated thermal enclosure to eliminate cold spots along the entire transfer path.
• High-inertness, de-activated fused-silica and stainless-steel transfer lines—certified for minimal adsorption, carryover, and memory effects across repeated injections.
• Modular trap design accommodating interchangeable sorbent beds (e.g., Tenax TA, Carbopack B/C, Carboxen 1000)—supporting method flexibility for aliphatics, aromatics, halogenated VOCs, and polar compounds.
• Integrated water management: dual-stage chilled condensation (vial cooling at ambient +1 °C) and thermally regulated water removal trap (ambient +1 °C to 240 °C) to minimize water vapor co-elution and GC column degradation.
• Robust fault-detection logic with automatic emergency shutdown upon motion anomaly detection—protecting mechanical integrity and ensuring long-term calibration stability.

Sample Compatibility & Compliance

The PT-2 accommodates both liquid (e.g., drinking water, wastewater, leachates) and solid-phase environmental samples (e.g., soils, sediments, sludges) without matrix-specific hardware modification. Its validated performance aligns with U.S. EPA Method 502.2, 524.4, and 8260D equivalents when adapted per local regulatory frameworks. All thermal zones—including trap, transfer line, valve, and desorption chamber—are independently PID-controlled with ±1 °C accuracy and documented thermal uniformity profiles. The system supports GLP-compliant operation via audit-trail-enabled method storage and RS232-based bidirectional communication with third-party GC data systems. It meets electromagnetic compatibility (EMC) Class B requirements per GB/T 18268.1 and electrical safety standards per GB 4793.1.

Software & Data Management

Operation is managed through an embedded 5.7-inch monochrome LCD interface with intuitive menu navigation and one-touch method execution. Preloaded analytical methods cover common VOC panels per HJ-series standards; users may edit, save, and password-protect up to 100 custom protocols. The RS232 port enables full remote control—including start/stop, parameter override, and status polling—from external chromatography data systems (CDS) such as Thermo Chromeleon, Agilent OpenLab, or Shimadzu GCsolution. Synchronization signals (TTL-ready, GC-ready) allow coordinated instrument triggering and event logging. Firmware updates are performed via USB—no proprietary software installation required.

Applications

• Regulatory monitoring of VOCs in municipal drinking water and wastewater effluents (e.g., benzene, chloroform, vinyl chloride).
• Site assessment and remediation verification of contaminated soils and groundwater plumes.
• Method development and validation for EPA SW-846 compliant laboratories.
• Research-scale screening of emerging contaminants (e.g., 1,4-dioxane, MTBE degradation products) in complex environmental digests.
• Quality control of industrial process waters and effluent discharges under ISO 17025-accredited testing protocols.

FAQ

Does the PT-2 support automated sample introduction?
Yes—the base unit is manually loaded, but it is fully compatible with optional 30- or 120-position autosamplers for unattended water-only or water/soil sequential analysis.
Can the system be integrated with GC–MS platforms from non-Chinese manufacturers?
Yes—its TTL-level synchronization interface and RS232 command set are vendor-agnostic and have been verified with Agilent, Thermo Fisher, Shimadzu, and PerkinElmer GC and GC–MS systems.
What trap sorbents are supported out-of-the-box?
The PT-2 accepts industry-standard ¼″ OD stainless-steel traps packed with Tenax TA, Carbopack B/C, or Carboxen 1000—users may specify fill type during order or retrofit existing traps.
Is method validation documentation provided?
A comprehensive factory test report—including temperature calibration certificates, leak test results, and functional verification against HJ 605-2011—is supplied with each unit.
What maintenance intervals are recommended?
Routine inspection of O-rings, valve seals, and trap frits is advised every 500 injections; full thermal zone recalibration is recommended annually or after any hardware replacement.