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2015, vol. 70, iss. 5, pp. 822-827
A system for measuring liquid flow based on heat loss of thick film NTC thermistors
aUniversity of Belgrade, Institute for Multidisciplinary Research
bIRITEL Institute, Belgrade-Zemun
Project:
Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing (MESTD - 45007)
Innovative electronic components and systems based on inorganic and organic technologies embedded in consumer goods and products (MESTD - 32016)

Keywords: sensor; flow; temperature; thermistors
Abstract
A system for measuring flow of liquids (water) based on heat loss was formed of two thick film segmented thermistors, power supply with constant voltages RCV, 8 voltage dividers RN, acquisition card and PC with custom IWF software. The thermistors were placed in two metal or plastic housings connected in series like and filled with liquid,(water).The first thermistor Th1 is referent and measures the temperature of water incoming to the sensor, while the second thermistor Th2 is the flow sensor and it is selfheated with self current at a constant supply voltage from power source. Using the command from the PC the RCV power source generates constant voltages for powering Th2 in steps of 2V per 5°C of input water temperature increase. The self-heating current I of the Th2 thermistor is measured vs. the water flow rate Q. The water flow rate is defined from the function Q=F(I). The acquisition card measures in multiplex 8 voltages on voltage dividers: each voltage is measured 10 times per second and the computer calculates the average value for each second.
References
*** (2007) SA Instrumentation & Control. The Official Journal of the SAIMC, TECHNEWS, (http: //www. technews co. za/), KROHNE mass flowmeters: Stainless steel calorimetric flow sensor, May, pp 1-3
*** (2008) Thermal mass flow meters and flow switches: Comparison of thermal mass flow meters and other flow technologies. Eldridge Products Inc
Baker, R.C. (2000) Thermal Flowmeters. Industrial Designs, Operating Principles, Performance, and Applications, : 371-390
Boer, H.J., Derks, W. (1995) ‘A precision thermal mass flow sensor for very small liquid flow', Bronkhorst High- Tech, Liqui-flow. in: Proceedings SENSOR, 95, pp. 97-102
Cross Instrumentation (2002) Engineered products for process measurement & control: A flow measurement primer - thermal mass flow meters. CI Journal, 10
Miller, T.E., Small, Hamish. (1982) Thermal pulse time-of-flight liquid flow meter. Analytical Chemistry, 54(6): 907-910
Powelectrics Limited (UK) (2010) Flow sensors: Thermal flow sensors for liquids. e-catalogue, /www. powelectrics. co. uk/products/flow_sensors
Seil Enterprise Co (2006) Flowmeter types and their principles. www.maxiflo.co.kr
Spitzer, D.W. (2001) Measurement flow: Practical guides for measurement and control isa (the instrumentation, systems, and automation society). 459-475
Viswanathan, M., Kandaswamy, A., Sreekala, S.K., Sajna, K.V. (2002) Development, modeling and certain investigations on thermal mass flow meters. Flow Measurement and Instrumentation, 12(5-6): 353-360
 

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article language: Serbian
document type: Professional Paper
DOI: 10.5937/tehnika1505822L
published in SCIndeks: 06/11/2015

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