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Sampling involves illuminating the sample to be tested and collected the transmitted or reflected light. Liquids are often measured using a flow-through sample cell. Alternatively, in-line sample probes can frequently be used. A great advantage of infrared-based analyzers is that a properly configured analyzer uses a long sample pathlength (often approximately 1 cm) so that sample handling problems often encountered with process analyzer systems is virtually eliminated.
Sample points can be located at considerable distance from the Analyzer System either using fiber optic cables for light transmission or reflective optics. Examples of both types of configurations are shown in several other screens in this display.
NIR and FT-IR analyzer systems are fast. Single sample measurement times can be milli-seconds (or faster) or minutes. Most liquid process analysis uses a measurement cycle time of approximately 1 minute. The key to the timing is the inherent process dynamics and the process control systems being used.
Measurements are extremely precise and repeatable. Makes infrared analysis ideally suited to real-time process control and optimization.
