FLUOROMETER ASSEMBLY INCLUDING A FLOW CELL

摘要

A fluorometer assembly consisting of a basic photometer unit having a photomultiplier tube and an excitation lamp projecting from its top wall. A flow cell block assembly is adapted to be mounted over and receive the photomultiplier tube and excitation lamp in cavities provided therefor in the block assembly. The block assembly includes a transparent flow cell and conduits are provided to pass a liquid sample through the flow cell. An optical passage is provided between the lamp cavity and flow cell, including a suitable excitation filter. Another optical passage at right angles to the first passage is provided between the flow cell and the photomultiplier tube cavity. A suitable emission filter is provided on the photomultiplier tube in the path of fluorescent light emitted by the sample liquid. The lamp has a manually rotatable slotted cover sleeve for at times blocking the lamp relative to the flow cell. The cell is held in place by a manually adjustable pressure screw, which also acts to exert a sealing force on a top plug element of the flow cell. The flow cell block assembly also includes a temperature-controlling cavity through which temperature-control liquid may be circulated.