Powerful options for method-compliant on-line monitoring

•  Continuous on-line monitoring. The TT24-7xr achieves continuous on-line monitoring through the use of two cold traps working in tandem. Two focusing traps working in tandem provide complete data-capture for on-line sampling of air using the TT24-7xr. At the time-point illustrated, sampling is taking place onto Trap A, while Trap B is being desorbed (with a portion of the flow to the GC being directed to a re-collection tube).

• Off-line analysis: In addition to on-line monitoring, sorbent tube analysis can be carried out on the TT24-7xr, making it suitable for a variety of air-monitoring scenarios.

• Re-collection and method validation: The ability to perform tube analysis facilitates the quantitative recovery and re-collection of on-line samples for repeat analysis, enabling easier analyte and method validation.

• Effective water management: When analysing humid air, the moisture must be removed before the gas flow reaches the GC column and detector, to avoid poor chromatography. However, some polar species and ultra-volatiles can be lost when using typical water‑management methods such as a Nafion™ dryer or trap dry-purge. The cryogen-free Kori-xr™ module addresses this problem by removing water from humid air prior to analyte focusing – allowing high-sensitivity analysis of polar species, oxygenates and monoterpenes, as well as all other typical VOCs. Use of the Kori-xr module with TT24-7xr provides excellent results for the analysis of a 100% RH, 65-component TO-15 standard containing polar and non-polar analytes.

System Features

•  Dual-trap continuous monitoring – 100% data capture.

• Operates cryogen-free – ideal for unattended remote-site operation over extended periods.

• Two independent sample channels – one for each of the two cold traps.

• Calibration channel – automated addition of calibration gas during sequence.

• Blank channel – automated addition of blank sample during sequence.

• Leak test – automated leak checks of all flow paths, including both traps, tube, and split.

• Internal standard (optional) – enables addition of gas phase standard onto either cold trap.

• Kori-xr™ (optional) – enables on-line removal of airborne humidity.

• Wide range of sampling flows with quantitative trapping offers high sensitivity.

• Inert, uniformly-heated flow path offers compatibility for C2–C40 compounds and reactive species.

• Ultra-rapid trap desorption delivers narrow peaks, optimising sensitivity even under splitless analytical conditions.

• Efficient desorption means no cross-contamination and excellent chromatographic resolution – eliminating false positives.

• Enhanced splitting options to accommodate high-level samples.

• Tube desorption option facilitates quantitative repeat analysis for easy validation of analyte recovery.

• Small footprint – suitable for mobile laboratories.

• Robust and low maintenance, including minimal gas consumption.

• Versatile: Compatible with any make of GC, fast GC, and various real-time vapour detectors.