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UV/Persulfate TOC Analyzer Uses Pressurized Detection

Category: Analytical Instruments

The Fusion UV/Persulfate TOC analyzer uses non-dispersive infrared (NDIR) technology. Traditionally, instrument manufacturers use this technology for measuring carbon in samples as CO2 gas. These measurements are performed by oxidation of carbon to create CO2, which is then swept through an NDIR detector. While this happens, the adsorption of the infrared light is measured over time. The resulting measurement is integrated and correlated to a concentration. In contrast, the Fusion analyzer uses pressurized detection, or static read. The specific carbon component is oxidized, and the resultant carbon dioxide is swept into the detector using a non-interfering inert gas metered by a mass flow controller (MFC). Static read is accomplished by closing a valve located at the outlet of the detector and pressurizing the detector cell with carrier gas containing the CO2 from the oxidized sample. A single measurement is made to determine the amount of CO2 inside the detector cell, correlating directly to the concentration of the carbon contribution from the sample. One measurement versus multiple measurements (integrations) made over time eliminates time delays and integration errors. With the CO2 in the pressurized cell and a single measurement, there is better sensitivity, lower detection limits and increase precision. Gas flow metered by the MFC allows direction of gas only when needed and lower gas consumption.
Teledyne Tekmar*
4736 Socialville Foster Rd.
Mason OH 45040
Phone: 513-229-7000
Fax: 513-229-7050
http://www.tekmar.com

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Michelle Longo
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