Entech Instruments
Headspace Preconcentrator 7150
Entech 7150 represents the next generation in headspace preconcentration systems for GC and GC/MS analysis. The 7150 is unique in its ability to recover a wide range of highly volatile to semi-volatile compounds at PPM to sub-PPB levels – including thermally labile compounds typically resistant to recovery using strong adsorbents. A unique multi-trap design is utilized to perform headspace preconcentrations, including a novel first stage that implements “Active SPME” to allow compounds from C12 to C25 to be trapped and recovered quantitatively without exposure to adsorbents or moisture removal traps.
Features
- Analyze Solids, Liquids, or Gases
- Sample Container Sizes 20cc to 1000cc For optimal sensitivity and statistical accuracy.
- Micro-QT™ Septumless Sample Interface Gas-tight seal both before and after headspace withdrawal.
- Supports Vacuum Extraction Perfect for rapid headspace equilibration into large vials.
- Detect up to C25 Quantitatively! PPM to sub-PPB Level Detection.
- Recovers Thermally Labile Compounds GC compatible compounds containing sulfur, phosphorous, nitrogen.
- Initial Active SPME Stage Eliminates exposure of heavy VOCs and SVOCs to strong adsorbents.
- Extremely Low Carryover (0.1% or less typical)
- Supports All Balance Gas Compositions (Air, nitrogen, CO2 , H2 , He, methane, mixture)
- Eliminates Moisture Utilizes direct vapor to solid phase cold trap dehydration.
- Handles High Ethanol Matrices
- Heat Samples from Ambient to 150°C
- Trapping of 5 to 1000cc Maximize your GCMS dynamic range!
- Exclusive! Deans Switching Headspace Preconcentrator (Eliminates Flow Path Rotary Valves)
- Liquid Nitrogen and LCO versions 3-stages can be LN2 or LCO2 cooled.
- Autosampling with 7500A or 7410 Robotic Headspace Inlets (Required), Ideal for R&D and Production Labs.
Flow Diagram & Connections
The 7150 is the world’s only multi-stage preconcentrator to utilize Deans Switching technology. Entech’s exclusive flow control solution completely eliminates plastic rotors and dead volume challenges associated with heavy and polar compound carryover. With an additional EPC pressure control separate from the GC, the 7150 can divert flow away from the column during initial trapping while simultaneously monitoring and pressure matching any sample from -12 to 35 psig. Deans Switching and inert Silonite® surfaces keep the 7150 exceptionally clean. This remarkably low contamination background enables full and unmatched utilization of today’s high-sensitivity GCMS systems.
Areas of Applications
Solid, Liquid, or Gas-Phase Samples
The 7150 Preconcentrator requires connection to either the 7500A or 7410 autosamplers. Both autosamplers feature Entech’s gas-tight, septumless micro-seal technology for unrivaled range, fexibility, and reproducibility when analyzing liquid, solid, and gas phase samples. All sample types, including those traditionally collected in Tedlar® bags, can be analyzed. A precisely heated Silonite® (fused silica) transferline inserts directly into the micro-seal interface, maintaining sample integrity during headspace extraction and resealing. An initial vacuum can also be placed on liquid and solid samples to reduce the equilibration time required with sample vials from 20 to 1000cc. For large canister analysis, both the 7500A and 7410 inlets feature expansion capabilities to interface with additional 7016CA-2 (16 position) tower autosamplers.
Food & Flavor / Beverage Testing
Unlike Classical “diffusive SPME” which cannot quantify the actual headspace volume analyzed, the 7150’s Active SPME followed by cold trapping on Tenax® provides a true representation of aroma compounds in the sample headspace. Aroma significant compounds are easily identfied using a small volume injection (10cc) using GC/Olfactometry. The corresponding mass spectrum can then be determined by analyzing a larger volume of headspace (50 to 1000cc). Only those aromas detected within the non-concentrated headspace aroma need be identified – significantly reducing aroma characterization complexity. (High ethanol concentrations can be eliminated prior to injection by forward purging the Tenax® trap at 0°C prior to back desorption).