Patent ID: 7961310

Claim:
A transmission cell for the measurement of the absorption of light by a liquid comprising; a cell body with inlet and outlet tubes attached to said cell body and creating a pathway to an inner bore of said cell which is sealed on both ends by inserts, each of said inserts having an insert inner bore with a tapered surface on the side towards the center of the cell which is sealed by an optical window on one side of each insert inner bore, an o-ring groove cut into said insert inner tapered surfaces and where said optical windows are discs with one side beveled to match an angle of said insert inner tapered surface so that an o-ring can be compressed by said beveled face of said optical windows said o-ring groove to achieve a face seal between said optical windows and said insert and a flat face of said optical windows protrudes through the tapered end of said insert, said inserts being oriented window to window and forming a gap in the middle portion of said cell body so that, when said cell is filled with liquid, said gap establishes path length through said liquid for light passing through said gap, and where said gap is enlarged near the circumference of said inserts providing a channel for the liquid to flow around a narrow gap between said optical windows thereby allowing an unimpeded flow of liquid through said cell regardless of the size of said gap.