Autosamplers for Purge and Trap: The Best Ones

A good autosampler automates the loading of laboratory samples into the sample injector of a chromatograph. In combination, the autosampler and the sample injector are known as the autosampler injection system – a method that separates compounds from the example so the chromatograph can detect all of them. There are five main types of autosampler injection systems:

S/SL (split/splitless) injection systems
On-column inlet systems
PTV injector systems
Gas source inlet systems
Free and trapsystems
With its dynamic capability to trap low level compounds, the particular purge and trap system is used for samples whose compounds occur on low-ppb (parts per billion) levels. When they choose an autosampler to get purge and trap, many laboratories narrow their choices to the Century WS Autosampler and the Archon/OI Model 4552 Autosampler. If you are evaluating these types of autosamplers, the comparisons below will aid your evaluation.

Centurion WS Autosampler vs . Archon Autosampler

Evaluating the Centurion WS to the Archon/OI Model 4552 should be done using criteria that determine the overall value of an autosampler to the user. These requirements are:

Analytical superiority
Mechanical robustness
Ease of use
Ease of maintenance
Analytical Superiority
The Centurion WS features electronic, three-position delivery, a programmable 1ul-100ul delivery, and does not require priming. These features give it one of the most versatile, reliable, consistent, and economical IS/Surr delivery systems on the market. By using a fast hot water rinse in a fixed volume loop that keeps water within the pathway hot, and flushing the minimizer parameter soil needle and transfer line with P&T’s Bake gas, it also features excellent carryover reduction.

The Archon/OI Model 4552 features mechanical, two-position delivery, the 1ul delivery, and requires priming. These features make it less flexible, reliable, consistent, and cost effective compared to Centurion WS. Its slow warm water rinse with a syringe also offers much less carryover protection.

Mechanical Robustness
The particular Centurion WS displays a high level of mechanical robustness due to the following specifications:

A fully supported X-Y-Z arm
Water vial sampling that occurs in the tray
A fiber optic vial messfühler
Vial sensing during transport just for soil samples
An elevator mechanism that only carries soil
Modular electronic design
A P&T concentrator that manages flow control
Removal of the syringe mechanism found in most autosamplers
In comparison, the specs for the Archon/OI Model 4552 are that it:

Has an arm whose left side is unsupported
Does not sample water vials in the tray
Features a mechanised switch (not a fiber optic sensor) that must be manipulated during vial transport
Has an elevator that movements both water and soil samples
Contains an all-in-one printed routine board instead of modular electronic style
Features separate pressure and stream control
Uses a syringe mechanism, which could lead to syringe errors.
The particular Centurian WS achieves high efficiency due to its dual concentrator mode for liquid and soil samples, and its particular generous sample positioning of one hundred water samples and 90 soil samples. These features create cost benefits for the GC/MC process and raise unattended autosampler operation. The Archon/OI Model 4552 lacks a dual concentrator mode and only features setting for 51 samples.

Ease of Use
Featuring remote control and intuitive Windows XP Software that is displayed on a 15″ clever monitor, the Centurion WS is among the easiest autosamplers to use. In contrast, the Archon/OI Model 4552 cannot be managed remotely, and features an interface that is manipulated via a small keypad.

Ease of Maintenance
The Centurion WS possesses three features that make it easy to maintain: an error tracking and sample log, on-board real-time flow layouts, and complete on-board diagnostic checks. The particular Archon/OI Model 4552 does not have these features.

An autosampler for purge and trap is an important investment for independent researchers and laboratories that analyze solids plus liquids using the GC/MC process. Although many laboratories use the Archon/OI Model 4552, it does not offer the same analytical superiority, mechanical robustness, productivity, ease of use, plus ease of maintenance as the Centurion WS. For large laboratories and self-employed researchers whose funding depends on analysis cost and quality, the Century WS the best autosampler for purge and trap.

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