LaMotte COD3 Plus Operator's Manual

Also see for COD3 Plus: Operator's manual

Contents

LaMotte COD3 Plus Operator's Manual Manual pdf 15 page image

COD3 Plus Colorimeter 11.14 15Below is a list of suggested wavelengths for the color of the reacted samples. Usethese as a starting point.Sample Color Wavelength RangeYellow 428Pink 525Red 568Green and Blue 635NOTE: Available wavelengths in the COD3 Plus are 428 nm and 635 nm. CALIBRATIONAs with all pre-calibrated meters, it is highly recommended, even if not requiredby regulations, that the user periodically verify the performance of the meterby running standards with a predetermined concentration. Results outside ofspecification are an indication that the meter needs to be adjusted. This can bedone following the user calibration described on page 32. If the user calibrationfails to properly adjust the meter then the meter should be returned to LaMotteCompany for recalibration. (See page 68). CALIBRATION CURVESThe COD3 Plus Colorimeter contains tests for the LaMotte reagent systems. Thefirst step in using a non-LaMotte reagent system with your COD3 Plus Colorimeteris to create a calibration curve for the reagent system. To create a calibrationcurve, prepare standard solutions of the test factor and use the reagent system totest the standard solutions with the COD3 Plus Colorimeter. Select a wavelengthfor the test as described above.Plot the results (in ABS or %Transmittance) versus concentration to createa calibration curve. The calibration curve may then be used to identify theconcentration of an unknown sample by testing the unknown, readingAbsorbance or %T, and finding the corresponding concentration from the curve.The linear range of the reagent system can be determined and this informationcan be used to input a User Test into the COD3 Plus Colorimeter (see Edit UserTests, page 39).PROCEDUREPrepare 5 or 6 standard solutions of the factor being tested. The concentration ofthese standards should be evenly distributed throughout the range of the reagentsystem, and should include a 0 ppm standard (distilled water). For instance,the solutions could measure 0, 10%, 30%, 50%, 70%, and 90% of the system’smaximum range.1. Turn on the COD3 Plus Colorimeter. Select the appropriate wavelength fromthe absorbance mode. Be sure to select the appropriate wavelength for thecolor produced by the reagent system.www. .com information@itm.com1.800.561.8187