PHOTOMETRIC MEASUREMENT CELL

摘要

An online colorimetric analyzer (100) that generates an indication of a material in a sample is provided. The analyzer (100) includes a peristaltic pump (200) configured to convey a sample. A photometric cell (206) is operably coupled to the peristaltic pump (200) to receive the sample. An illumination source (210) is disposed to direct illumination through the sample in the photometric cell (206) along an angle of incidence. A photodetector (212) disposed to receive illumination passing through the photometric cell (206) along the angle of incidence and provide a signal indicative of a color of the sample. A controller (102) is coupled to the illumination source (210), the photodetector (212) and the peristaltic pump (200). The photometric cell (206) is tilted relative to vertical such that a surface (216) of liquid present when the photometric cell (206) is partially filled substantially reflects the illumination away from the angle of incidence.