Sample Preconcentration and Enrichment Options

Sample Preconcentration and Enrichment Options

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SRI offers a variety of trapping options for preconcentrating or enriching samples for GC analysis.

Traditional Heated Adsorbent Trap for preconcentrating molecules between C₃ and C₁₅
CryoCooled Peltier Trap for very volatile molecules like ethane and hydrogen sulfide
Permeation Trap for gases dissolved in liquid samples
Enrichment Coil for thermal modulation of gas streams

In terms of flow, the preconcentrator is always upstream of the GC column oven. Traps and valve ovens are mounted on the left-hand side of the GC. The GC shown at right has a TO-14 Air Concentrator with a CryoCooled Peltier Trap.

Most of these options employ the versatile 10-port gas sampling valve described on the previous pages. Each valve in turn requires a heated valve oven. The only exception featured in this section is the Enrichment Coil option, designed for use on the Model 110 detector chassis or in the GC column oven.

Permeation trap with DGA-TOGA accessory

CryoCooled Peltier Trap

Dual TO-14 Air Concentrator (four traps, two valves)

Sample Preconcentration and Enrichment Options

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