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The Liquid Level Detection System Based on Capacitance Sensor

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In automation systems applied in clinical laboratories, automatic pipetting operation has been the foundation and an important part of the liquid handling platform. Making a disposable pipette tip automatic detection of the liquid surface is the precondition to ensure accuracy and intelligence of the entire operating capacity of liquid handling platform. By conducting research on the liquid level sensing technology of capacitance sensor, in this paper we designed a new type of stable and small sized liquid level detection system and verified its stability, instantaneity and accuracy by setting up a small reagent distribution platform. It was shown that the liquid level detection system designed in this paper has reliable stability, good instantaneity and high accuracy, with the liquid level detecting accuracy being above 99.5%, the response speed after detecting the liquid level reaching millisecond and the depth in the liquid level less than 0.5 mm. Besides, the system was able to detect a variety of commonly used laboratory reagents and was consistent with technical indicators of liquid handling platform.
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Keywords: AUTOMATIC LIQUID HANDLING PLATFORM; CAPACITANCE SENSOR; LABORATORY AUTOMATION; LIQUID LEVEL DETECTION SYSTEM

Document Type: Short Communication

Publication date: March 1, 2017

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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