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Astro Ecology's Total Oxygen Demand Analyzer 1400 is intended for on-line use in process plants. Significant improvements in performance and reliability are made possible by Astro's unique multistage reaction chamber, say the manufacturers. The reaction chamber handles a continuous sample flow at a rate of nominally 4 cc/min and is not clogged by solid particles up to ⅛ inch in diameter. The result is accurate analysis of a large, representative, continuous flow of waste along with suspended solid particulates, and essentially automatic, unattended operation.