TT24-7: Near real-time monitoring 24 hours per day, 7 days per week
Introducing the TT24-7
Air / gas is first sampled onto the channel A focusing trap at electronically controlled flow rates up to 1 L/min. At the end of the sampling time, channel B is switched in-line while channel A is pre-purged, desorbed and analysed. Trap heating rates approaching 100°C/sec combined with a reverse flow of carrier gas ensure efficient backflush desorption of analytes over a wide boiling range - giving narrow peak widths and optimum sensitivity. When sampling switches back to channel A, channel B is desorbed and analysed.
Patented inert valves inside the TT24-7 isolate the sampling process from the analytical system allowing the analysis to overlap with collection of a subsequent sample. Sampling can proceed on the desorption system while GC or MS analysis of the previous sample continues.
The TT24-7 can operate standalone (i.e. connected directly to the analyser) or in combination with a UNITY desorber. Standalone versions work well for semi-volatiles which are refocused on-column. TT24-7-UNITY systems offer the ultimate concentration efficiency (analytical sensitivity) for volatiles - especially if isothermal chromatographic analysis is required.
Continuous monitoring with multi-stream selection
Trace heated and ambient temperature options are available for multi-stream selection. Systems can be custom configured to suit your network monitoring requirements.
Tube desorption for calibration and verification
The TT24-7 Tube Desorption Accessory allows standards to be introduced to either of the focusing traps from a sorbent tube. This facilitates routine calibration and allows certified reference standard tubes to be introduced for auditing analytical quality assurance.
Parallel sampling onto a sorbent tube at the inlet of a TT24-7 on-line sampling line also allows comparison of on- and off-line monitoring data for system verification. The sampled sorbent tubes are analysed on the TT24-7 system via the Tube Desorption Accessory. Since the quantitative recovery of GC-compatible organics from sorbent tubes is well documented, satisfactory correlation of the tube results with those for the same sample analysed on-line verifies analyte recovery through the on-line sample interface.