Online process control

Volume 42 Quantitative Gas Chromatography for Laboratory Analyses and Online Process Control by G. Guiochon and C.L. Guillemin... 

The online process control software provides a simple interface between the analyzer, the user, and the control room. 

In comparison to previous summaries of industrial applications of IMS, the discussion here illustrated a wide breadth of applications in the past decade. In addition, significant depth is seen, with methods applied in actual online process control, monitoring of stacks, ambient air monitoring, and measurements with authentic samples, not only standard laboratory solutions. The versatility and capability of IMS are now proven in the range of chanicals monitored, the complex matrices for some samples, and the demands on instruments. The advantages of IMS include reliability and quantitative performance, speed of response, durability in accepting sample with little preparation, and low detection limits. When samples are complex enough to create complications from competitive reactions in the ion source, remedies have been found with fast GC or temperature-ramped desorption of sorbent traps. 

Y. Cheng, M.A. Jafari, Vision-based online process control in manufacturing applications. IEEE Trans. Autom. Sd. Eng. 5(1), 140-153 (2008)... 

Even though the theoretical minimum of the problem is not achieved, the solution is feasible. Thus, these methods are useful when an improvement in the objective function is enough and the constraints must be fulfilled, such as in several online process control and optimization problems. 

Jones, AW. Schuberth, J. (1989) Computer aided headspace gas chromatography applied to blood alcohol analysis importance of online process control. Journal of forensic science. 34,5,1116-1127. 

It is now common for manufacturers to offer ready-to-use reagents, often as complicated mixtures, for use in automated analytical procedures such as in clinical biochemistry and for online process control. 

Van der Linden WE (1986) Flow injection analysis in online process control. Analytica Chimica Acta 179 91-101. 

Probes usually have variable temperature control to run experiments at temperatures selected by the analyst. Cryogenically cooled probes can improve the resolution of a system, so that a 600 MHz spectrometer equipped with such a probe can provide resolution equivalent to a 700-800 MHz instrument. In some systems, samples can be heated up to 80°C. New probe designs with flowthrough sample holders are commercially available for use in coupled HPLC-NMR instruments, HPLC-NMR-MS instruments, and online process control analyzers. These hyphenated instruments and process instruments are discussed under applications later in the chapter. 

Minerals Radiometric Sorting and Online Process Control. 499... 

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