Apparatus for detecting bubbles in reagent pipetting apparatus

Details Apparatus for detecting bubbles in reagent pipetting apparatus Apparatus for detecting bubbles in reagent pipetting apparatus

1992-06-12

1994-06-14

Williams, Hezron E.

Measuring and testing

Gas content of a liquid or a solid

Particular separator

G01N 700

Patent

active

053199545

ABSTRACT:
In an automatic analyzer of samples, the liquid specimen and the reagent are mixed in a reaction container to react. If, however, there is a bubble in the reagent container, a accurate amount of a reagent may not be dispensed. Accordingly, a liquid surface detecting circuit for detecting the liquid surface on the basis of the impedance change between a pipet and a ground is disposed, and the height of the liquid surface before and after suction of the reagent is compared on the basis of the liquid surface detecting information, and the bubble is detected when the difference is more than a specified value, and accordingly the driving circuit of the driving source is controlled by the control circuit. Thus, when dispensing the reagent in the reagent container by a pipet, the bubble can be detected securely and accurately, and this apparatus may be used in a slender reagent container.

REFERENCES:
patent: 3470902 (1969-10-01), Hackman
patent: 3681546 (1972-08-01), Coin et al.
patent: 4235095 (1980-11-01), Liebermann
patent: 4444222 (1984-04-01), Yamagiwa
patent: 4696191 (1987-09-01), Claytor et al.
patent: 4772157 (1988-09-01), Obermeyer
patent: 5152175 (1992-10-01), Reynolds

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