Importance

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Abstract

A rotameter comprises a vertically disposed flow passage with cross sectional area progressively increasing from the lower inlet to the upper outlet thereof, and a float suspended in the flow passage and guided by a plurality of ridge-like float guides disposed parallel to and axisymmetrically about the central axis of the flow passage, which float guides keep the float suspended in the fluid stream in a coaxial relationship to the flow passage, wherein a float position indicator disposed within an elongated groove included in one of the float guides following the guiding edge thereof moves with float in vertical directions due to the magnetic attraction therebetween created by a permanent magnet included in either the float or the float position indicator, and provides an electrical signal representing the vertical position of the float, from which the flow rate of the fluid moving through the flow passage is determined. A pair of rotameters respectively having two floats with different values of the weight to volume ratio installed in a series arrangement provides a three-in-one rotameter that simultaneously determines the mass and volume flow rates of the fluid and the density of the fluid as functions of the vertical positions of the two floats respectively included in the two rotameters.

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First Claim