Optical wastewater pretreat sensor

An optical sensor system for calculating the percentage of pretreat fluid within a fluid mixture comprising:

• a housing with four holes, comprising
• a through hole through the housing in which a transparent vessel is inserted so that the housing encapsulates a portion of the transparent vessel, wherein the transparent vessel contains a fluid mixture comprising a percentage of a pretreat fluid;
• a cylindrical hole positioned perpendicular to the through hole that connects the exterior of the housing to the transparent vessel, comprising
• a first diameter and a second diameter, wherein the first diameter is larger than the second diameter, and
• a light source positioned adjacent to the exterior of the housing within the cylindrical hole that emanates light throughout the cylindrical hole, wherein
• some light is reflected back through the cylindrical hole by the narrowing of the cylindrical hole from the first diameter to the second diameter, and
• some light emanates through cylindrical hole into the transparent vessel and the fluid mixture, and reflects off the housing encapsulating the transparent vessel;
• a light source measuring hole positioned perpendicular to the cylindrical hole, wherein the light source measuring hole connects the exterior of the housing to the cylindrical hole along its first diameter, and
• a pretreat measuring hole positioned perpendicular to the through hole that connects the exterior of the housing to the transparent vessel;
• a light source photodiode positioned adjacent to the exterior of the housing within the light source measuring hole that measures the light reflected back through the cylindrical hole by the narrowing of the cylindrical hole from the first diameter to the second diameter;
• a pretreat photodiode positioned adjacent to the exterior of the housing within the pretreat measuring hole that measures the light reflected off the housing encapsulating the transparent vessel after the light has passed through both the transparent vessel and the fluid mixture;
• and
• a microprocessor connected to both photodiodes that uses data from the photodiodes to calculate the percentage of the pretreat fluid in the fluid mixture.