Capacitive level sensing pipette probe

Details Capacitive level sensing pipette probe Capacitive level sensing pipette probe

1995-10-24

1997-07-15

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324667, 324697, 324671, 73304C, 422106, 422 8201, B01L 302, G01F 2324

Patent

active

056487274

ABSTRACT:
A capacitive fluid level sensing pipette probe adapted to be used in an automated random access immunoassay analyzer is provided. The pipette probe comprises an elongated shaft having a conductive tip. An integrated circuit chip containing capacitive sensing circuitry is positioned on the pipette probe itself, or in very close proximity. With this arrangement, the sensing circuitry moves with the pipette probe as it is raised and lowered into and out of a vessel containing a liquid. Thus, errors associated with capacitance caused by flexing connector cables is eliminated. Flex tape wiring may be used to carry data from the capacitive sensing circuitry on the pipette probe to the processing board of the automated immunoassay analyzer.

REFERENCES:
patent: 4025846 (1977-05-01), Franz
patent: 4429272 (1984-01-01), Bungay
patent: 4970468 (1990-11-01), Ishizawa
patent: 5032794 (1991-07-01), Ridd
patent: 5045286 (1991-09-01), Kitajima

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