SE374207

Method and apparatus for the quantitative determination of an ingredient of a fluid sample by the degree of luminescence created when the sample is reacted with another substance. The apparatus includes a photometer having a planar light-receiving window and a conduit providing a sinuous passageway portion formed in a body having its axis lying in a plane parallel to the photometer window and in proximity thereto and constructed of a transparent material. The sinuous passageway portion effectively obscures the window and is of substantially the same overall area. This conduit has an outlet portion at one end of the sinuous passageway portion and has an inlet close to or in the other end of the sinuous passageway portion. A sample and a reagent flow together and are intermixed in close proximity to the sinuous passageway portion, and are fed into the aforementioned inlet for flow into and through the aforementioned sinuous passageway portion for a luminescent reaction therein. A device is provided for receiving a signal from the photometer and for recording the results of the analysis.