G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 23/22 (2006.01) G01F 23/284 (2006.01) G01N 33/53 (2006.01) G01N 35/00 (2006.01)
Patent
CA 2362531
The invention discloses an automated liquid level sensing system for detecting the presence of liquid in a container, comprising an electrically conductive and movable probe positioned above said container; a signal source electrically connected to said probe, said signal source capable of energizing said probe thereby causing said probe to transmit said electrical signal at a given frequency; a receiving antenna and means for transferring said received electrical signal from said receiving antenna to an analyzing means; wherein analyzing said received electrical signal includes: (1) means for detecting changes in received signal amplitude, wherein said means for detecting changes in received signal amplitude includes:(a) means for multiplying said received signal by a reference signal, said reference signal having a frequency substantially equal to the frequency of the transmitted signal; and (b) a low pass filter through which is passed said multiplied received signal; and (2) means for measuring rate of change of said change in received signal amplitude; and means connected to said analyzing means for indicating that liquid has been detected. The invention further discloses a method of automatically detecting the presence of liquid in a container using the system of the invention. An automated liquid sensing system for use in a clinical analysis system having a pipettor for dispensing or aspirating liquid in a container, the pipettor being electrically conductive and moveable vertically into the container, using the automated liquid sensing system of the invention further comprising a means electrically connected to the pipettor for applying a RF signal thereto and causing the pipettor to radiate an electromagnetic field, the propagation of which changes when the pipettor contacts the surface of the liquid in the container is further disclosed.
Hills David B.
Vaught James A.
Walker Donny Ray
Abbott Laboratories
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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