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Hinshaw J.V.,Serveron
LC-GC North America | Year: 2017

Separation scientists may seek an optimum spot between the chromatographic performance required to obtain sufficient results quality, and the time and resources needed to do so. This installment of “GC Connections” examines the factors that control peak resolution-one of the main drivers of separation quality-and how chromatographers can use this information to find an optimum between time, cost, and performance. © 2017, UBM Medica Periodical Publication. All rights reserved.


Hinshaw J.V.,Serveron
LC-GC North America | Year: 2017

In this installment, John Hinshaw presents an annual review of new developments in the field of gas chromatography (GC) seen at Pittcon 2017 and other venues in the past year. © 2017 UBM. All rights reserved.


Hinshaw J.V.,Serveron
LC-GC North America | Year: 2017

Gas chromatographers can control several variables that affect their separations: carrier-gas flow, column dimensions, and stationary-phase chemistry. When faced with less than optimum resolution or separation speed, a strategy of changing just one variable at a time can be more productive than trying to hit the goal in one attempt. This month’s “GC Connections” examines how to use such a plan to obtain better gas chromatography results. © 2017 UBM. All rights reserved.


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

John Hinshaw presents his annual review of new developments in the field of gas chromatography (GC) seen at Pittcon and other venues in the past year. © 2017 UBM. All rights reserved.


Hinshaw J.V.,Serveron
LC-GC Europe | Year: 2017

Small differences in process gas chromatography (GC) results from the same sample stream over time can indicate corresponding changes in target analyte concentrations, or the fluctuations might be due to external influences on the instrument. This instalment of ”GC Connections” explores ways to examine such results and better understand their significance. © 2017 UBM. 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.


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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