Sample monitoring instrument for on-line application

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

1987-04-14

1990-03-20

Richman, Barry S.

Chemistry: analytical and immunological testing

Including titration or ph determination

436 51, 436 52, 436 54, 436 55, 422 81, 137143, 73226, 366191, G01N 3116

Patent

active

049101510

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. A sample chamber is over filled and the excess removed from the chamber by using a downwardly extending drain line which terminates at a precisely positioned, downwardly facing inlet negative pressure is applied 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.

REFERENCES:
patent: 618835 (1899-02-01), Bowen
patent: 1235316 (1917-07-01), Henderson
patent: 1564430 (1925-12-01), Maddrell
patent: 1574149 (1926-02-01), Hompes et al.
patent: 2461334 (1949-02-01), Major
patent: 2884942 (1959-05-01), Caldwell et al.
patent: 3415267 (1968-12-01), Karlen et al.
patent: 3589385 (1971-06-01), Vitous
Soviet Inventors Illustrated, Section Chemistry, Week C27, Aug. 13, 1980 (SU 491286, No. 17, 1979).
Process Instruments and Controls Handbook, Third Edition, pp. 6.98-6.104.

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