Apparatus for dispensing very small quantities of liquid

Details Apparatus for dispensing very small quantities of liquid Apparatus for dispensing very small quantities of liquid

1982-07-30

1984-11-20

Skeggs, H. Grant

Dispensing

Automatic control

Material level control

239 61, 222630, 73304C, 137392, 361284, B67D 508

Patent

active

044834632

ABSTRACT:
Apparatus for the dispensing of very small amounts of liquid includes a measuring vessel which can be filled with an amount of liquid, and to whose outlet there is connected an ejector of a partial quantity. A sensor responds to the liquid level in the measuring vessel, to control a filling system which receives therefrom a signal for the filling of the measuring vessel when the minimum permissible lower liquid level is reached and a signal for the ending of the filling process when the maximum permissible upper liquid level is reached. The sensor is a capacitor which extends at least over the entire range of the variable liquid level in the measuring vessel and whose dielectric is the liquid situated in the measuring vessel. A capacitance meter is provided for measuring the capacitance of the capacitor.

REFERENCES:
patent: 2375084 (1945-05-01), Coroniti et al.
patent: 3224638 (1965-12-01), Harrell
patent: 3321971 (1967-05-01), Llewellyn et al.
patent: 3391547 (1968-07-01), Kingston
patent: 4223806 (1980-09-01), Buschmann

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