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Hinshaw J.V.,Serveron
LC-GC Europe | Year: 2016

While gas chromatographers may take their septa for granted, in fact these small and seemingly unremarkable polymer disks keep air out of the carrier-gas stream when used in an inlet and keep samples intact and uncontaminated when used in sample vials. Choosing the wrong septa can compromise method accuracy and repeatability as well as reduce column life in extreme cases. This instalment addresses septa for inlets and sample vials. © 2016, Advanstar Communications Inc. All rights reserved.


Hinshaw J.V.,Serveron
LC-GC Europe | Year: 2015

The term dead volume often comes up in chromatography discussions and literature. This month we address the nature of this phenomenon, when it can become a problem that affects chromatographic results, and how to understand and take control of it. © 2015 Advanstar Communications Inc. All rights reserved.


Hinshaw J.V.,Serveron
LC-GC Europe | Year: 2015

In gas chromatography (GC) split injection systems, as much as 99% or more of the injected sample never enters the column: It is released downstream of the inlet where it can encounter and possibly perturb precision gas control devices. The split-vent trap acts to prevent or at least moderate such effects. This month’s instalment addresses the operation and maintenance of split-vent traps. © 2015 Advanstar Communications Inc. All rights reserved.


Hinshaw J.V.,Serveron
LC-GC Europe | Year: 2015

In this instalment, John Hinshaw reviews gas chromatography (GC) instruments, columns, and accessories that were newly on display at the Pittsburgh Conference in New Orleans, Louisiana, USA, during March 2015, or were introduced to the marketplace in the preceding year. © 2015, Advanstar Communications Inc. All rights reserved.


Hinshaw J.V.,Serveron
LCGC North America | Year: 2014

Have you wondered how the gas chromatography (GC) carrier gases helium, hydrogen, argon, and nitrogen are transformed from their natural conditions or precursors into highly purified compressed states inside laboratory gas cylinders or generators? Here, we track the genesis of the top four carrier gases before they start their journey through a GC system. © 2014 Advanstar Communications, Inc. All rights reserved.


Hinshaw J.V.,Serveron
LC GC Europe | Year: 2014

This month's instalment discusses the laboratory deployment of gas cylinders with appropriate pressure regulators, gas filtration, and gas fittings, as well as the question of cylinder retirement.


Patent
Serveron | Date: 2011-11-15

A method for extraction of gas from liquid provides for reliable and accurate extraction of gases dissolved in fluids and routing the extracted gas to an analytical instrument. An extraction module comprises one or more fluorosilicone membranes molded into the shape of a flattened disk. The membranes are retained in a housing in a spaced apart relationship. The membrane is permeable to target gas(es), but not to the fluid. Porous support members support the membranes and prevent damage to them and the housing defines separate fluid flow paths for the fluid and the gas extracted from it. Fluid is passed over the membrane in a first fluid phase; target compounds in the fluid diffuse across the membrane to a second fluid phase until equilibrium is achieved.


Patent
Serveron | Date: 2014-04-16

A reliable, low cost device for determining when dangerous levels of hydrogen gas have been generated in a transformer is disclosed. The hydrogen indicator is defined by a module assembly that threads into either the headspace or into the oil-filled body of a transformer. The module has an open interior that contains a film that incorporates a hydrogen-sensitive chemochromic indicator. The indicator film is visible through a lens. When the film has been exposed to hydrogen, chemical changes in the chemochromic indicator cause the film to change colorthe color change is immediately visible through the lens.


A gas monitoring apparatus and system that provides for reliable and accurate monitoring of gaseous hydrogen and other compounds in dielectric oil. The apparatus provides an environment for and is used in conjunction with metal oxide semiconductor sensors. Thermal conditioning zones for oil provide an environment in which variations in oil temperature and ambient temperature are eliminated to insure that analytical data are not affected by these environmental conditions.


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