Sample monitoring instrument for on-line application

Details Sample monitoring instrument for on-line application Sample monitoring instrument for on-line application

1988-12-29

1990-03-27

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing liquid or solid sample

422 81, 422 8202, 422 8203, 422 8212, 137130, 137132, 137143, 137145, 137152, 366191, 73226, G01N 114

Patent

active

049118919

ABSTRACT:
An apparatus and method for on-line monitoring of a characteristic of a process liquid stream includes a cell for isolating a precise volume of the liquid. There are provided means for over-filling a sample chamber and means for removing the excess from the chamber comprising a downwardly extending drain line which terminates at a precisely positioned, downwardly facing inlet and means for applying negative pressure to the drain line to draw the excess liquid upwardly from the captured volume until the liquid level reaches the inlet and entry of air disrupts the liquid draining effect. The embodiment shown employs a closed volume, a vent, a conduit for delivery of process liquid into the cell under pressure and a syphon/drain line for removing excess liquid from the cell volume until there remains only a sample of accurately repeatable volume.

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Process Instruments and Controls Handbook, Third Edition, pp. 6.98-6.104, 1985.
Soviet Inventors Illustrated, Section Chemistry, Week C27, Aug. 13, 1980 (SU 491286, Nov. 17, 1979).

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