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The LECO CS-400 is a combustion analyzer designed for the measurement of carbon and sulfur in a variety of materials, including metals, ores, ceramics, and other inorganic substances. This instrument is part of LECO's series of analyzers known for their precision and reliability in elemental analysis.

Key features and functions of the LECO CS-400 include:

1. Measurement of Carbon and Sulfur: The CS400 is specifically designed to measure the carbon and sulfur content in various materials. This is particularly useful in industries where these elemental compositions are critical, such as metallurgy, mining, and material science.

2. Combustion Analysis Technique: The sample to be analyzed is combusted in a stream of purified oxygen. This combustion process produces carbon dioxide (CO2) and sulfur dioxide (SO2) from the carbon and sulfur present in the sample, respectively.

3. Infrared Detection: Following combustion, the generated CO2 and SO2 are detected and quantified using infrared detection. This method is known for its sensitivity and accuracy in detecting these gases.

4. Detection Capability: The CS400 is capable of detecting carbon and sulfur down to low concentrations in a metal sample. This level of sensitivity makes it suitable for a wide range of applications where precise quantification is necessary.

5. Use of Standards for Accuracy: To ensure accuracy, standards are run with each sample. These standards have a carbon and sulfur content as close to the sample as possible, providing a benchmark for accurate measurement.