Obstruction detection circuit for sample probe

Details Obstruction detection circuit for sample probe Obstruction detection circuit for sample probe

1994-05-09

1996-04-02

Noland, Thomas P.

Measuring and testing

Sampler, sample handling, etc.

Capture device

7386411, 340608, 340625, G01N 114, G01N 3510

Patent

active

055030360

ABSTRACT:
An obstruction detection circuit for detecting an obstruction of a sample probe of an automated sample aspiration/dispensation device and a method for detecting such an obstruction. In one embodiment the obstruction detection circuit includes a pressure sensor measuring the pressure in a fluid conduit connecting a pump and the sample probe orifice. The pressure within the connecting fluid conduit is measured by the pressure sensor shortly after the start of the aspiration or dispensation of a fluid volume by the automated sample aspiration/dispensation device. The pressure within the connecting fluid conduit is again measured after the completion of the aspiration or dispensation, and if the pressure has not returned to a predetermined range within a predetermined amount of time, an error condition is reported.

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