Gas Generator blends gas standards in laboratory.
October 16, 2003 - Model 491M dynamically blends calibration standards for trace sulfur and oxygenated compounds in carbon dioxide. Secondary dilution feature gives adjustable low ppb and ppt concentrations over 400:1 range with constant output flow. Unit can generate gas mixtures from permeation tubes, diffusion tubes, and compressed gas cylinders. Mixture concentrations are traceable to NIST through physical standards. Interchangeable modules allow customization.
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Original Press release
Kin-Tek Laboratories
501 Laurel
LaMarque, TX, 77568 4202
USA
Calibration for Impurities in Carbon Dioxide
KIN-TEK's 491M Modular Gas Standards Generating System dynamically blends calibration standards for trace sulfur and oxygenated compounds in carbon dioxide. Trace Source™ permeation tubes add known concentrations of typical sulfur and oxygenate species to a flow of beverage grade CO2. A secondary dilution feature gives adjustable low ppb and ppt concentrations over a 400:1 range with constant output flow. The standard additions technique is used to compensate for residual contamination in the matrix gas. Mixture concentrations are traceable to NIST through physical standards.
Trace sulfur, oxygenates, and other naturally occurring impurities in carbon dioxide used for carbonation can create "off taste" and "off odor" in the beverage product, so the CO2 is continually monitored to assure product uniformity. Effective calibration of these monitoring systems requires traceable reference standards at multiple concentrations for all of the potential contaminants. Typically, static mixtures containing trace concentrations of the typical contaminant compounds are not stable in storage.
For more information, please write or call: KIN-TEK Laboratories, Inc., 504 Laurel, La Marque, TX 77568, Phone: (409) 938-3627, Fax: (409) 938-3710, www.kin-tek.com, email: sales@kin-tek.com
DESCRIPTION
KIN-TEK is proud to announce the development of a new, modular Gas Standards Generator, the Model 491M, for blending gas standards in the laboratory. A unique feature of this unit is its capability of generating concentration ranges from sub-ppb levels to over fifty percent, from pure compounds, using single step dilution. The Model 491M can generate gas mixtures from permeation tubes, diffusion tubes, and compressed gas cylinders. It can also humidify the gas standard or house special analyzer interface controls. The interchangeable modular features of the instrument allow the user to customize it to fit specific applications.
For low concentration mixtures, permeation tubes are used to generate a very small, precisely known flow of the component compound. This permeate flow is then mixed with a much larger flow of a matrix (or diluent) gas to form the trace concentration mixture. Using this method, concentrations from low ppb to over 1000 ppm can be prepared directly from pure compounds.
Each 491M cabinet can house up to 3 modules in one standard 19" cabinet. One mod ile is a "Base" module with a permation oven, mass flowmeter for dilution flow measurement, and dilution flow controls. The other modules to select from are: 1) a module for blending high concentration mixtures (% levels) directly from a compressed gas cylinder; 2) a gas standard humidification module; 3) a module for analyzer interface controls; 4) a gas control module for converting the standard permeation oven to one which can use gas filled permeation tubes; 5) additional liquid filled permeation tube oven modules.
By adding an expansion cabinet, up to 6 modules can be combined for multi-component, multi-parameter mixture control. Each module is equipped with output signals to allow interfacing for computer readout of mixture composition.
The 491M can be used to dilute higher concentration EPA Protocol or NIST reference standards to trace working levels. It can also use NIST Permeation Tubes. These capabilities are becoming increasingly important in meeting governmental requirements.
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