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- Zetian - Model GCTD-500 - Enrichment ...
Zetian - Model GCTD-500 -Enrichment Desorber
The Enrichment Desorber is a pretreatment device for gas chromatography analyzers. It is a fully automated, direct-feed, single-channel cold trap enrichment and thermal desorber that uses a combination of six-way valves and solenoid valves in the gas line design, and Tenax or activated charcoal adsorbent tubes as the enrichment and thermal desorption tubes to enrich trace volatile organic compounds (VOCs) in the ambient air, thus lowering detection limits of chromatography analyzers. The cold trap adopts Stirling cooling at -120°C, which meets the demand of low-temperature
enrichment;
Simple operation, easy use, automatic process realized by software control of the whole process
Can set periodic sampling with heating throughout to realize low sample residues, good
precision and high accuracy
Adopt direct sampling for water removal, enrichment and analysis, with no need of
disassembling the adsorption tube;
Automatic blowback in the gas path improves the accuracy of the next measurement and avoids
cross contamination;
Strong versatility: can be used with most gas chromatography and mass spectrometry products.
Effective enrichment times: 50 ~160 times
Cold trap heating speed: ≥40℃/s
Desorption time: 1 ~ 99.9 min; control accuracy is 0.1 min;
Sampling flow rate: 0 ~ 50mL/min (adjustable)
Purge cleaning flow: 0 ~ 200mL / min (adjustable)
Resolution recovery: ≥95% (benzene)
Qualitative repeatability: RSD ≤3.0%
Quantitative repeatability: benzene, total hydrocarbons RSD ≤ 2.0%, other RSD ≤ 5.0%.
Range/zero point drift: ≤3.0% (1d)
Temperature stability: ≤±1℃
Measurement cycle: 30~60min (adjustable)
Sampling control mode: MFC electronic flow control
Used with chromatography analyzers or workstations for detection of trace VOCs, ODS,sulfides, and other components in plant ambient air, indoor ambient air, and the atmosphere.