EXPEC 249 Fully Automatic Purge & Trap Sampler

System Overview

The EXPEC 249 purge & trap sampler is a sample pretreatment system for capturing volatile organic compounds (VOCs) in liquid, solid, and gaseous samples. A liquid sample is introduced into the purge tube and purged with an inert gas. VOCs are carried by the inert gas through the internal flow path and retained on the trap. After the purge & trap process, the valve switches the trap into the GC carrier-gas flow path. The trap is rapidly heated, and the desorbed VOCs are transferred with the GC carrier gas into the GC/GC-MS system for separation and analysis.

System Features

• User-friendly purge sensing design
Overflow monitoring and foam detection greatly improve system reliability.
• High-efficiency trap temperature feedback control
Three-bed trap; programmable up to 450°C; maximum heating rate >1000°C/min.
• Physical water removal function
No consumables required; efficient physical water remover with water removal efficiency ≥96%.
• Inert flow path
Low cross-contamination risk, minimal analyte loss, and high reproducibility.
• Precise control
Precise gas-flow, timing, and temperature control for highly reproducible and accurate results.
• Ruggedized design
Suitable for both fixed laboratories and mobile laboratories.
• Flexible compatibility
Compatible with GC and GC-MS instruments from various manufacturers.
• Easy operation
Intuitive visual software interface for straightforward operation.
• Diagnostic assistant
Full flow-path system leak check helps ensure reliable data quality.

System Specifications

Item	Specification	Item	Specification
Purge tube	5 mL, 25 mL	Transfer-line temperature	Ambient +5°C to 300°C
Trap	Three-bed trap	Valve oven temperature	Ambient +5°C to 300°C
Trap heating	Direct resistive heating	Gas-path control	EPC, EFC precision electronic control
Cooling rate	From 250°C to ambient in ≤2 min	Gas type	Nitrogen Helium
Water management unit	Water removal >96%	Communication	LAN
Transfer line	1/16 in OD × 140 mm length	Leak-check mode	Automatic leak check
Foam sensor	Optional; effectively protects the sample flow path	System functions	Instrument alarms, maintenance logs, etc.
Overflow sensor	Optional; effectively prevents liquid overflow	Power supply	AC 220 V ±10% / 50 Hz