Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-01-03
1997-05-06
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340620, 7386424, 7386422, 7386433, B01L 302
Patent
active
056275226
ABSTRACT:
An automated liquid level sensing system for use in an automated, continuous, and random access analytical system is disclosed. A pipette probe is positioned above, and lowered into, a liquid sample container which contains the liquid to be detected. The probe is energized by a near radio-frequency (RF) signal source. A receiving antenna is positioned below the sample container, and is oriented so that very little signal is detected from the probe while the probe is in air. When the probe contacts liquid in the sample container, the electromagnetic field of the RF signal is increased and reoriented toward the receiving antenna. An autozero circuit maintains a near-zero output from the receiving antenna when slow changes in signal level occur due to changes in probe position or other environmental factors. The autozero circuit allows the sudden increase in signal amplitude, due to liquid contact, to pass to a receiver. A shield-driven triax cable connects the autozero circuit to the receiver, and significantly reduces the normal capacitance of the cable, enabling the signal change to be more easily detected.
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Hills David B.
Vaught James A.
Walker Donny R.
Abbott Laboratories
Hofsass Jeffery
Lieu Julie B.
Weinstein David L.
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