Quantitative dispenser for a liquid

Details Quantitative dispenser for a liquid Quantitative dispenser for a liquid

1989-04-14

1990-07-31

Lacey, David L.

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

422 58, 422 65, 422107, 422119, 7386302, 73293, 356375, 436 53, G01F 1100, G01N 114

Patent

active

049449222

ABSTRACT:
A quantitative dispenser for a liquid includes a pipette having a downwardly directed nozzle which serves to pick up and deliver a predetermined quantity of a liquid and a mechanism for moving the pipette downwardly to dip the lower end of the pipette into the liquid supply. A detector is provided for detecting reflection of light which is projected downwardly to the surface of the liquid while the pipette is moved downwardly to approach the surface. A control circuit is connected to the detector to determine the stop point for the downwardly moving pipette with the aid of information received from the detector. The detector is provided with a spot type reflection sensor having a light convergent optical element having a focal point at a certain distance below the detector whereby the stop point of the downwardly moving pipette is determined so as to correspond to a point of maximum intensity of the incoming reflected light.

REFERENCES:
patent: 4160168 (1979-07-01), Funck
patent: 4247784 (1981-01-01), Henry
patent: 4326851 (1982-04-01), Bello et al.
patent: 4341736 (1982-07-01), Drbal et al.
patent: 4410020 (1983-10-01), Lorenz
patent: 4451433 (1984-05-01), Yamashita et al.
patent: 4495149 (1985-01-01), Iwata et al.
patent: 4558946 (1985-12-01), Galle et al.

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