A colorimetric analyzer (100) includes a reaction chamber (118) configured to receive a sample and at least one reagent. A measurement cell (122) is operably coupled to the reaction chamber (118). The measurement cell (122) has an illumination source (116) and an illumination detector (114) spaced from the illumination source (116) such that illumination from the illumination source (116) passes through the reacted sample to the illumination detector (114). A controller (102) is coupled to the illumination source (116) and the illumination detector (114). The controller (102) is configured to generate an analytic output based on a signal from the illumination detector. A fill conduit (154) is operably interposed between the reaction chamber (118) and the measurement cell (122). The fill conduit (154) is configured to reduce bubbles.
