NEPHELOMETRIC TURBIDIMETER

摘要

The invention refers to a nephelometric turbidimeter (100) with a cylindrical vial (10) for measuring the turbidity in a fluid sample, preferably in a liquid sample. The vial (10) comprises a transparent vial body (12) comprising a transparent flat bottom inlet window (16) and a transparent cylinder body (14) with a circular outlet window (20). The vial (10) is provided with a cylindrical optical shielding (30) being provided at the cylinder body (14) over a part of the axial length of the cylinder body (14). The shielding (30) is arranged axially adjacent to a non-shielded cylinder part serving as the outlet window (20), the shielding (30) optically blocking the inside from the outside of the vial (10). The optical shielding (30) is provided axially above the outlet window (20) of the cylinder body (14). The optical shielding avoids that a measurement light beam which is reflected by the boundary-layer of the liquid sample and/or by the vial cap and not directly irradiate the scattering light detecting arrangement.