Abstract: An apparatus for sampling powdered material which is moving along with a flow of gas or air through a large pipe. A probe located in the center of the pipe and facing upstream is connected to a smaller conduit leading to a cyclone separator. When a valve on the conduit is opened periodically, a free flow of gas and powdered material goes through the conduit to a cyclone separator. At the bottom of that separator is a sample-collecting container which can be removed periodically to test the accumulated contents. The valve on the conduit is opened and closed by means of air pressure. Prior to opening of that valve, that same air pressure is used to purge the conduit between the valve and the probe of accumulated powdered material.