MAGNETIC FLUID-FLOW METER FOR GASES

The paper presents the constructive details and functioning principle of an electronic volumetric flow meter for gases, which exploits the p roperties of magnetic fluids and has no moving mechanical components. It is a bidirectional flow meter, operating both in static and in movi ng conditions. The flow meter has a sensing unit, which consists of tw o sensors, one for differential pressure and an other for acceleration or inclination angle and of a tubular measuring element, as well as a n electronic measuring system. Details are given on the hydrodynamic-e lectronic correction mechanism, which eliminates the influences of inc linations and accelerations on the volumic flow signal, followed by a description of the main features of the electronic system. The experim ents performed showed the possibility of metering even very small gas volumes, such as 0.1 cm3 at a flow rate of 50 cm3/min. The metering at higher flow rate values, up to 100 m3/h, needed only the insert of th e measuring element corresponding to the requested flow rate domain.