Analysis and optimization of a thermal sensor system for measuring water flow
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AuthorsAleksić, Obrad S.
Nikolić, Maria Vesna
Luković, Miloljub D.
Nikolić, Pantelija M.
Article (Published version)
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A simple thermal sensor system was designed for measuring water flow in the water mains using the heat loss principle with a NTC thick film segmented thermistor as a self-heating sensor. Thick film segmented thermistors were screen printed on alumina substrate. NTC thermistor paste was formed of very fine Cu0.2Ni0.5Zn1.0Mn1.3O4 powder obtained by a combined mechanical activation/thermal treatment process, an organic vehicle and glass frit. The thermal sensor system was analyzed in the static and dynamic regime. A range constant voltage power supply was defined in the range 9–19 V for input water temperatures of 30–2 °C, maintaining a supply voltage in steps of 2 V for a change in 5 °C of input water temperature. This enables optimal operating power, i.e. heat generation on the self-heating thermistor. Measured calibration curves for different input water temperatures and input water flow rates were modeled, enabling interpolation of additional calculated curves to cover a wide range of... input water temperatures.
Keywords:thermistors / thick film devices / water flow / thermal sensors
Source:Sensors and Actuators A: Physical, 2013, 201, 371-376