Carbon dioxide analyzer 6200E

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The need to continuously detect for sulfides in carbon dioxide has become increasingly important within the food and beverage market. Gas suppliers must ensure that the CO2 they provide for use in the preservation of food and drink related products meet today’s exacting standards. The contamination of carbon dioxide can emanate from many sources and therefore it is essential that the CO2 used for such purposes be monitored at the CO2 generator facility, at the beverage producer facility, or both. PRINCIPLE OF OPERATION The Model 6200E Total Sulfides Analyzer utilizes proven UV fluorescent technology to continuously detect sulfides found in inert gas streams. An internal, quartz catalytic converter is employed to convert the sulfides, when mixed with scrubbed ambient air, into SO2 via high temperature oxidation. An internal vacuum pump is employed to draw both the sample and the ambient air into the converter. The converted sample gas is fed to the fluorescence chamber where it is then exposed to ultra-violet radiation. The measurement process in the reaction cell is described by the following equation: SO2 + hu1 d SO2* SO2* d SO2 + hu2 Where hu1 is the incident UV energy at 214nm and hu2 is the resultant fluorescence, which is directly proportional to the SO2 concentration in the reaction cell. The fluorescence emission is in turn sensed by the photo-multiplier tube (PMT) and amplified to provide an analog output. The result is a continuous measurement of total sulfides (i.e. H2S, CS2, COS, mercaptans, etc.) as SO2 from 0-50 ppb to 0-20 ppm.