Process and a device for carrying out measurements at a foaming

Details Process and a device for carrying out measurements at a foaming Process and a device for carrying out measurements at a foaming

1988-11-04

1991-07-30

Noland, Tom

Measuring and testing

Volume or rate of flow

Tank type

73 1H, 73 32R, 73304R, G01F 176, G01F 2300, G01F 2500, G01N 900

Patent

active

050351397

ABSTRACT:
The specific density of the liquid/air mixture is measured at successive levels within the reception vessel for the liquid using a reference measurement (Io) representing the specific density of the degasified liquid within a reference measuring path. The ratio of each obtained density value measurement and the reference value is calculated for each measuring level and multiplied with the specific density of the liquid to allow an accurate measurment of the overall liquid volume or flow-rate. Preferably the reception vessel (1) has a respective measuring electrode (El . . . En) at each measuring level with a common counter electrode (Eo) coupled to an oscillator (4) via a constant voltage circuit (5) and a coupling capacitor (6). Each measuring electrode (El-En) is coupled via a multiplexer (7) and an active rectifier (9) to an A/D converter (10) coupled to a microprocessor (11) controlling a read-out display (12).

REFERENCES:
patent: 3370466 (1968-02-01), Chang
patent: 3933030 (1976-01-01), Forster et al.
patent: 4084426 (1978-04-01), Gales
patent: 4391222 (1983-07-01), Icking et al.
patent: 4433577 (1984-02-01), Khurgin et al.
patent: 4450722 (1984-05-01), Keyes, IV et al.
patent: 4452176 (1984-06-01), Hoetelmayr et al.
patent: 4485763 (1984-12-01), Icking
patent: 4794256 (1988-12-01), DiMartino
patent: 4833918 (1989-05-01), Jean et al.
patent: 4841770 (1989-06-01), Davies
Chemical Engineering-"Online Measurement of Liquid Density"; C. H. Hoeppner, Oct. 1984-pp. 71 to 78.

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