PROCEDE ET DISPOSITIF DE MESURE DU DEBIT OU DE LA QUALITE GRANULOMETRIQUE D'UN MATERIAU PULVERULENT

The present invention relates to a procedure and apparatus for measuring the throughput or the grain size of divided products. The apparatus comprises essentially a hopper (11), a detection electrode (13) held at a potential which is different from that of the hopper, an amplifier (18) and a measuring circuit comprising, for example, three branches (7, 8 and 9). At the time of their passage over the electrode (13) the particles discharged via the hopper (11) are charged. The current coming from the electrode (13) is amplified, and its continuous and pulsating components are measured by measuring instruments (20 and 24), or are used by a counter (26). This apparatus may be used for determining the grain size of a product when its throughput is known, or the throughput of a divided product when its grain size is known.