Air/liquid detection device for blood sample analysis

摘要

An air/fluid sensing device useful in apparatus for analyzing biological material. The device includes one or more light sources directed at a surface of a container defining an interface with the space enclosed thereby. Depending on whether fluid is present in or absent from the container at the location where said one or more light sources are directed to said surface, the light emanating from the sources will be refracted or reflected, thereby giving an indication of whether fluid is present or absent at said locations.