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Hence the missile concern is removed with a generator, and there’s no large volume of gas to suddenly vent and make the atmosphere potentially explosive or deficient of life-supporting oxygen. Additional safety features are also incorporated in the design; for example, leak detection auto shut-off devices.
Increased Convenience
High-pressure gas cylinders will require regular replacement. Gas cylinders running out part way through analysis will result in unplanned downtime, and a replacement cylinder has to be collected and the old one removed which brings manual handling and safety concerns. After the new cylinder has been connected restarting the instrument, and waiting for stable baseline and re-calibration, are required before samples can be run. Life is more convenient with a gas generator as there’s no unplanned downtime. Analytical gas generators only require simple quick maintenance, which can be planned for – they don’t unexpectedly run-out of gas halfway through analysis.
Increased Purity
Analytical gas generators provide a constant source of gas. This removes the variations in purity between cylinders, helping to improve sensitive analysis. Purity is also preserved because there is no chance for impurities to enter the gas pipes, which may happen as cylinders are switched and regulators changed-over.
Reduced Cost
High-pressure gas cylinders can also prove to be costly: typical payback periods on analytical gas generators are short – sometimes less than one year. The cost of using high pressure cylinders is not just the cost of the gas itself but other charges, some of which can be seen and others which are hidden. Cylinder rental and delivery charges are readily apparent, however there’s also hidden costs. These must also be included to reveal the true cost.
Analytical gas generators do not have the hidden costs of cylinders. There are no recurring costs with generators for activities such as ordering replacement cylinders, there are no storage costs for the spare and empty cylinders, and there is no cost of lost productivity through the need to stop and replace cylinders.
A Smarter Choice for LC/MS
Providing nitrogen for uses such as LC/MS, Parker domnick hunter’s pressure swing adsorption nitrogen generators represent state-of-the-art technology. The carbon molecular bed simply and efficiently separates compressed air into nitrogen. The carbon molecular bed achieves this due to its selective adsorption capabilities for different gases – oxygen and other unwanted constituents of the compressed air are simply removed by desorption – the complete process is monitored by a sophisticated control system.
These generators, when connected to an existing compressed air supply, will provide a constant supply of nitrogen with limited moving parts inside the generator. This means that the generator is very quiet whilst operating and there are minimal replacement parts.
A Smarter Choice for GC
Hydrogen offers advantages for GC users when used as a carrier gas. The Van Deemter curves illustrate the wide range over which high efficiency is obtained, making hydrogen the best carrier gas for samples containing compounds which elute over a wide temperature range. The risks associated with high-pressure gas cylinders have already been outlined – hence a gas generator is the smarter choice for hydrogen. The optimised design of Parker domnick hunter hydrogen generators take deionised water and, through electrolysis, separate the hydrogen. This is then purified using desiccants, and specialist micro dryers.
Innovative Technology
Parker domnick hunter analytical gas generators are world renowned for their reliability, dependability and long life. Part of the reason behind this is the unique innovative technology employed in the generators, from carbon molecular sieve, to the use of robust hydrogen membranes.
An End For Cylinders?
With the improvements that gas generators offer in the areas of safety, purity, convenience and cost there’s little reason to use high-pressure gas cylinders with instruments such as GC and LC/MS.
First Published in International Labmate, Oct/Nov 2011 Microvalve Replacement Completes Line
Merlin Instrument Company is pleased to announce an extension of the Merlin Microseal™ line. A new adapter kit (P/N 61-12) allows Microseals to be used with Shimadzu GC-2010 and GC 2025 gas chromatographs (GC). The Microseal is a microvalve replacement for conventional injection port septa, which provides longer lifetimes and improved chromatographic performance for manual, automated and solid phase microextraction (SPME) injections. The kit is available for immediate shipment and completes the Microseal line making adapters available for all major GC manufacturers.
Circle no. 329
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