Abstract: Apparatus for measuring the flow rate of particulate solids such as coal or coke at temperatures of up to about 1000.degree. C. The solids impinge from a predetermined height onto a sensing plate and the impulses imparted thereto are fed to a measuring system. A gastight housing is provided with an inlet for the solids and an intermediate chamber communicates with the inlet and contains a substantially horizontal conveyor for moving the solids to a passage which leads downwardly to a downcomer well disposed below the passage. The downcomer well contains the sensing plate against which the solids impinge.