Preliminary communication
Published in: Holistic Approach Environ. 1(2011) 4, pp. 147 – 156
Paper reference number: HAE-11
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DESIGNING LOW GAS FLOW METERS BASED ON THE CALOMETRIC PRINCIPLE OF FLOW RATE MEASURING
Marián Lázár*, Tomáš Brestovič*, Eva Schvarzbacherová*
* Faculty of Mechanical Engineering, Technical University in Košice, Slovakia
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ABSTRACT
The current assortment of sensing devices for measuring rate of fluid flow covers a wide range of requirements related to normal operation conditions. In the area of the low and very low fluid flow devices the offered assortment is being diminished sharply. Availability of the devices is very limited and costly. The aim of the article is to design a methodology for constructing a sensor for measuring the low liquid flows and the experimental verification of design. The gas flow meter is based on the calometric measurement principle so that the flow rate it assessed taking into account the known transferred amount of heat to the fluid flow and the temperature differences of the medium before and after electric coil of Thomas cylinder determined by thermocouples.
Keywords: nitrogen, gas flow meter (Thomas cylinder), thermal flow sensor
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