The online calculator only requires two data inputs. They are the volume in gallons of your parts washer reservoir and your desired concentration in ounces per gallon. May times people confuse concentration of a chemical solution in ounces per gallon with the concentration as a percentage. The two are different. Tech Services always refers to concentration as ounces of chemical per gallon of solution. This eliminates the problem of converting a powdered chemical that is measured in pounds to a specific volume quantity.
How to Use the Calculator:
Go to the chemical calculator link at http://www.marttechservices.com/Chemical_Concentration_Calculator.htm
Click in the first blue box to enter your washer reservoir volume in gallons. If you do not know your StingRay Washer volume you may use the chart at the bottom of the calculator to estimate it. All newer StingRay machines have a name plate on the electrical panel that specifies the washing machines reservoir volume.
Next enter your desired detergent concentration in the next blue box. There is already a default value of 7 ounces per gallon. You may keep this number or change it. The calculator automatically updates when you click out of the box or you may click the update button at the top of the page.
The amount of power or liquid chemical you need to add for the desired concentration is display in the yellow boxes to the right of the entries you made. As a reference the concentration in percent is also displayed in the white boxes. Note that while the concentration in oz/gal is the same for both power and liquid the concentration in percentage is different for each. This is the main reason we use oz/gal for concentration.
The second calculator is for determining the amount of chemical to add to adjust your bath from one concentration level to another. Enter your titrated concentration in the top blue box and your desired concentration in the next blue box below. The amount of chemical to add to adjust your concentration is shown in the yellow boxes.