Measuring and testing – Liquid level or depth gauge
Patent
1998-10-29
2000-11-21
Williams, Hezron
Measuring and testing
Liquid level or depth gauge
73304C, 73304R, 7386411, 73 6163, 422 66, 422 67, 422 681, 340620, G01F 2300, G01N 114, G01N 3100, B01L 302
Patent
active
061486663
ABSTRACT:
A liquid transfer device for an analysis unit includes a transfer needle having a tip, and a capacitive liquid level detector for detecting immersion of the tip of the needle into an analysis liquid by detecting a change in capacitance between a signal electrode and a counter electrode. The analysis liquid is contained in a vessel. The capacitive liquid level detector includes a signal electrode, a counter electrode, and a detection circuit connected to the signal electrode and the counter electrode. The detection circuit detects a change in capacitance between the signal electrode and the counter electrode. A temperature dependent detection resistor is disposed adjacent the tip of the liquid transfer needle. The tip of the liquid transfer needle and the temperature dependent detection resistor are movable into and out of the analysis liquid. The detection circuit includes a current supply for supplying current to the detection resistor. The detection circuit is configured to detect a change in resistance of the detection resistor during a immersion thereof into the analysis liquid.
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Boehringer Mannheim GmbH
Loo Dennis
Williams Hezron
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