HYDROSTATIC WEIGHING SYSTEM AT THE INRiM FOR CALIBRATING HYDROMETERS

S. Lorefice, A. Malengo

Abstract

Hydrometers are simple but effective instruments for measuring the density of liquids. In this work, we present the new hydrostatic weighing system developed at the INRiM, formerly IMGC – CNR, for the calibration of hydrometers in the range 500 kg·m^-3 to 2000 kg·m^-3. <br />
The apparatus which uses a method to automatically align specific scale-marks for the calibration of hydrometers, makes easy the whole calibration procedure and allows to reduce the former uncertainty declared by laboratory. It consists of a vision system, a stepping motor, and software to control the system. The vision system, composed of a CCD camera and a frame grabber, is used to acquire images. The overall performance of the apparatus is illustrated by the assessment of the uncertainty for some usual kinds of hydrometers sent to the Institute for calibration.

Keywords

hydrometer, calibration, artificial vision

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PWC-2006-TC3-049u.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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