Apparatus for testing pipetting needle linearity in an automated

Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Sample mechanical transport means in or for automated...

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422 63, 422 64, 422 8201, 422 8202, 422100, 436 49, 324519, 324661, 324758, G01R 3100

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055122477

ABSTRACT:
An analyzer has a horizontally disposed baseplate on which primary containers and secondary containers are disposed, a pipetting needle, a transport device, and a control device. The pipetting needle is formed of an electrically conductive material and is connected to a metering device by a tubing, and is for transferring a predetermined volume of liquid each time from a primary container to a secondary container. The transport device is for the controlled transport of the pipetting needle in three directions at right angles to one another, two of the transport directions extending horizontally and the third transport direction extending vertically. The control device is for controlling the metering device and the transport device. For the purpose of testing the linearity of the pipetting needle the analyzer includes a device for guiding the tip of the pipetting needle around the periphery of the top edge of a reference body (the tip of the pipetting needle is guided at a specific distance from the top edge of the reference body, which distance is a measure of the acceptable curvature of the pipetting needle), and an electrical circuit for detecting electrical contact between the tip of the pipetting needle and the reference body.

REFERENCES:
patent: 4757437 (1988-07-01), Nishimura
patent: 4830832 (1989-05-01), Arpagaus et al.
patent: 5055263 (1991-10-01), Meltzer
patent: 5104621 (1992-04-01), Pfost et al.
patent: 5270210 (1993-12-01), Weyrauch et al.
patent: 5306510 (1994-04-01), Meltzer
Derwent Abstract No. AN-93-260036/33.
Patent Abstracts of Japan, vol. 14 (498) (P-1124) (Oct. 30, 1990) of JP-A-02 203 269.

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