13
SAMPLE DILUTION TECHNIQUES
If a test result is out of the range of the meter, as indicated by an over range message
on the display, the sample must be diluted and retested.The following table gives quick
reference guidelines for dilutions of various proportions.
Amount of Sample
Deionized Water to Bring Final
Volume to 10 mL
Multiplication Factor
10 mL
0 mL
1
5 mL
5 mL
2
2.5 mL
7.5 mL
4
1 mL
9 mL
10
0.5 mL
9.5 mL
20
All dilutions are based on a fi nal volume of 10 mL, so several dilutions will require small
volumes of the water sample. Graduated pipets should be used for all dilutions. If
volumetric glassware is not available, dilutions can be made with the colorimeter tube. Fill
the tube to the 10 mL line with the sample and then transfer it to another container. Add
10 mL volumes of deionized water to the container and mix. Transfer 10 mL of the diluted
sample to the colorimeter tube and follow the test procedure. Repeat the dilution and
testing procedures until the result falls within the range of the calibration. Multiply the test
result by the dilution factor. For example, if 10 mL of the sample water is diluted with three
10 mL volumes of deionized water, the dilution factor is four. The test result of the diluted
sample should be multiplied by four.
OPTIONS & SET UP
FACTORY DEFAULT SETTINGS
Settings that have user options have been set at the factory to default settings.
The factory default settings are:
Turbidity Calibration Curve
Nephelometric (N)
Turbidity Units
Default
Turbidity Measurement
Turbidity-No Blank (NB)
Averaging
Disabled
Date Format
MM-DD-YYYY
Power Save
5 minutes
Backlight
10 seconds
Language
English
