LaMotte 2020e, User Instruction

Page: 8 / 44

All dilutions are based on a final 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 Units NTU
Turbidity Calibration formazin
Averaging Disabled
Date Format MM/DD/YY
Language English
Auto Shutdown Disabled
RESET TO FACTORY DEFAULT SETTINGS
To return the meter to the factory settings, turn the meter off. Hold down
*
I
OK
button.
Press
ON
. Release both buttons. Press
*
I
OK
button to select the default settings.
Meter will turn off and the factory settings will be restored. Restoring the factory settings
will remove the user-level calibration but not the zeroing. To change the default
settings follow the instructions in the following sections.
TURBIDITY
The default units are NTU and the default calibration curve is formazin. To change the
settings:
SELECTING TURBIDITY UNITS
1. Press
ON
to turn the meter on.
1 . 3
8 OPTIONS & SETUPS • TURBIDITY UNITS