Single dose screening for particulate materials

A system for transferring a particulate material from a first container to a second container including an upper portion, a lower portion and a sieve. The upper portion having a housing and a high frequency vibrator, the housing having a first end, a second end opposite the first end, and a gasket positioned adjacent the first end. The lower portion having a collector funnel, a low frequency vibrator and a collar securing the low frequency vibrator to the collector funnel. The sieve having a mesh size, a perimeter and a gasket positioned adjacent the perimeter. The upper portion is releasably secured to the first container and the sieve is releasably secured between the second end of the upper portion and the lower portion. 本发明提供种用于将颗粒状材料从第容器转移到包括上部部分、下部部分和筛网的第二容器的系统。所述上部部分具有外壳和高频振动器，所述外壳具有第端部，与所述第端部相对的第二端部，和邻近所述第端部定位的垫圈。所述下部部分具有收集器漏斗，低频振动器，和将所述低频振动器固定到所述收集器漏斗的套圈。所述筛网具有网眼尺寸，周边和邻近所述周边定位的垫圈。所述上部部分可释放地固定到所述第容器并且所述筛网可释放地固定在所述上部部分的第二端部和所述下部部分之间。