Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1987-08-19
1988-04-12
Levy, Stewart J.
Measuring and testing
Sampler, sample handling, etc.
Capture device
73304C, G01N 3506, G01F 2300
Patent
active
047366389
ABSTRACT:
Apparatus for sensing liquid levels in fluid transfer mechanisms and the like comprises a conductive member supporting containers for sample liquids, the conductive member being rotatably mounted for positioning selected containers under a conductive pipette probe. A low-frequency oscillator is capacitively coupled to the conductive member for generating an alternating electric field and producing an electrical signal at the probe. As the probe is lowered toward the liquid, an amplifier circuit monitors an electrical signal received by the probe. When the probe contacts the liquid, the amplifier detects a signal level in excess of a threshold level and produces an output signal for inhibiting the downward movement of the probe at the moment of contact with the liquid.
REFERENCES:
patent: 3687632 (1972-08-01), Natelson
patent: 4276258 (1981-06-01), Ginsberg et al.
patent: 4389900 (1983-06-01), Gutierrez
patent: 4615351 (1986-10-01), Schliefer et al.
Kan Peter
Okawa Dobson
Pang Wing S.
Beckman Instruments Inc.
Grant Arnold
Hampson Gary T.
Levy Stewart J.
May William H.
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