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The CS844 Carbon Sulfur Analyzer is engineered to accurately determine the carbon and sulfur contents in a variety of materials such as metals, ores, ceramics, and other inorganic substances. This advanced instrument is equipped with a specialized software, tailored for easy touch-screen operation.
For analysis, a sample, usually about 1 gram, is burned in a stream of pure oxygen. This combustion is facilitated by RF induction, which heats the sample. During this process, any carbon and sulfur in the sample turn into carbon dioxide (CO2) and sulfur dioxide (SO2), respectively. These gases are then carried by the oxygen flow through various components - a heated dust filter, a drying agent, and then through two sets of non-dispersive infrared (NDIR) cells. In the first set, sulfur is detected as SO2. The gas flow then moves past a heated catalyst that transforms carbon monoxide (CO) into CO2, and SO2 into sulfur trioxide (SO3), which is later removed by a filter. The second set of NDIR cells detects carbon as CO2. To ensure accurate readings, a pressure controller maintains a steady pressure in the NDIR cells, mitigating the effects of atmospheric pressure variations. The final element in the system is an electronic flow sensor, used for diagnostic checks by monitoring the carrier flow.
The non-dispersive infrared cells operate on the principle that CO2 and SO2 uniquely absorb infrared (IR) energy at specific wavelengths in the IR spectrum. As the gases pass through the IR absorption cells, they absorb IR energy. The cells are designed with varying path lengths to accommodate both high and low signal ranges, and the software automatically selects the appropriate cell for optimal measurement. The concentration of substances in unknown samples is gauged against calibrated standards. To minimize errors due to instrument drift, reference readings of the pure carrier gas are conducted before each analysis.