Turbidimeter having a baffle assembly for removing entrained gas

An apparatus for measuring turbidity of a fluid comprising:

• a housing having a cavity with an inlet and an outlet through which the fluid respectively flows into and out of said housing, the cavity having upper and lower regions;
• first, second and third vertically extending walls spaced from one another within the cavity of said housing, thereby forming a first cavity section on one side of said first wall with the inlet opening into the first cavity section, a second cavity section on another side of said first wall and between the first and second walls, a third cavity section between the second and third walls, and a fourth cavity section on an opposite side of said third wall from the third cavity section with the outlet communicating with the fourth cavity section;
• said first wall defining a first passage in the upper region through which substantially all the fluid flows between the first and second cavity sections;
• said second wall defining a second passage in the upper region between the second and third cavity sections, and a third passage between the second and third cavity sections in the lower region;
• said third wall defining a fourth passage in the upper region between the third and fourth cavity sections, and defining a fifth passage between the third and fourth cavity sections in the lower region;
• and
• means for measuring the turbidity of the fluid flowing in the third cavity section.

A method for calibrating a turbidimeter which includes a housing having a cavity, means for emitting a beam of light through the cavity, means for sensing a magnitude of light transmitted through the cavity, and means, responsive to the magnitude of the light, for producing a signal corresponding to a turbidity of a material in the cavity;

• said method comprising the steps of:
• placing a body of glass ceramic material, which has a predefined equivalent turbidity, into the cavity;
• operating the turbidimeter to produce the signal;
• and
• adjusting the means for producing a signal until the signal corresponds to the predefined equivalent turbidity.