The mass flow rate of particles conveyed by a gaseous medium through a conduit is measured by an electrostatic flow meter comprising a grounded electrical conductor in contact with a semiconductive static charge-generating element exposed to the moving particles. As the particles pass the semi-conductive, static charge-generating element, they impart a static charge to the element which is transferred by the conductor to ground. The resulting current, which can be measured by any suitable current measuring means, is proportional to the mass flow rate of the particles.
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