Patent ID: 6888636

Claim:
An apparatus for measuring the color properties of a fluid, comprising: a fluid analysis cell having a cavity therein; upper and lower light transmitting viewing windows which are transparent to visible light enclosing opposite ends of the cavity; a spacer fixedly positioned in said cavity between said upper and lower viewing windows providing a fluid chamber where fluid flows between said windows; a fluid inlet and outlet channel connected in fluid communication with said fluid chamber to enable fluid to flow into and out of said fluid chamber; and, a light transmitting and a light receiving probe positioned in any order above and below the upper and lower viewing windows, wherein the faces of each probe are in axial alignment with each other and are contiguous and flush with the viewing windows and orthogonal to the direction of flow but separated from the flow by the viewing windows, so that light transmittance measurements can be taken over the visible spectrum orthogonal to the direction of flow to determine the color properties of the fluid in the cell.