The Combination of Micro Diaphragm Pumps and Flow Sensors for Single Stroke Based Liquid Flow Control
| Autor: | Johannes Häfner, Martin Richter, Christoph Kutter, Sebastian Kibler, Christoph Jenke, Jaume Pallejà Rubio |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
differential pressure based flow sensor Capacitive sensing Acoustics Pulsatile flow thermal flow sensor Micropump 02 engineering and technology Differential pressure lcsh:Chemical technology 01 natural sciences Biochemistry Article Analytical Chemistry Electronic engineering micropump flow sensor flow control single stroke sensor velocity damping lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation Resistive touchscreen 010401 analytical chemistry 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Volumetric flow rate Flow control (fluid) Liquid flow 0210 nano-technology |
| Zdroj: | Sensors; Volume 17; Issue 4; Pages: 755 Sensors, Vol 17, Iss 4, p 755 (2017) Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| DOI: | 10.3390/s17040755 |
| Popis: | With the combination of micropumps and flow sensors, highly accurate and secure closed-loop controlled micro dosing systems for liquids are possible. Implementing a single stroke based control mode with piezoelectrically driven micro diaphragm pumps can provide a solution for dosing of volumes down to nanoliters or variable average flow rates in the range of nL/min to mL/min. However, sensor technologies feature a yet undetermined accuracy for measuring highly pulsatile micropump flow. Two miniaturizable in-line sensor types providing electrical readout differential pressure based flow sensors and thermal calorimetric flow sensors are evaluated for their suitability of combining them with mircopumps. Single stroke based calibration of the sensors was carried out with a new method, com paring displacement volumes and sensor flow volumes. Limitations of accuracy and performance for single stroke based flow control are described. Results showed that besides particle robustness of sensors, controlling resistive and capacitive damping are key aspects for setting up reproducible and reliable liquid dosing systems. Depending on the required average flow or defined volume, dosing systems with an accuracy of better than 5% for the differential pressure based sensor and better than 6.5% for the thermal calorimeter were achieved. |
| Databáze: | OpenAIRE |
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