LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 30)

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CALIBRATING LaMOTTE PRE-PROGRAMMED TESTS
The LaMotte Pre-Programmed Tests have been pre-calibrated. Recalibration of
the pre-programmed tests by the user is not possible. However, a procedure to
standardize the calibration can be performed to obtain the most accurate
readings or to meet regulatory requirements.
The LaMotte Pre-Programmed tests are standardized with one standard
solution. To standardize over the full range of the test, the concentration of the
standard should be chosen from the high end of the range. Alternatively, if
samples do not cover the full range of the test, a standard should be chosen that
is close to the concentration of the samples.
The standardization procedure should be followed as often as required by
regulations and laws for compliance monitoring.
In the example below the Aluminum calibration will be standardized.
Prepare a standard solution to be tested. Use 0.10 ppm aluminum.
Use the
s or t button to scroll to 002 Aluminum.
Follow instructions in the COD PLUS Manual for
testing the aluminum standard. Scan the blank.
002 Aluminum
* Scan Blank
The screen will display Blank Done for about 1
second. Scan Sample will be positioned next to *.
002 Aluminum
Blank Done
* Scan Sample
Place the reacted sample in the chamber, close the
lid and press
Q/ENTER to scan sample. The result
will be displayed.
002 Aluminum
* Scan Sample
The displayed result can now be standardized. Use
the
s or t buttons to scroll to Calibrate. Press
Q/ENTER to select.
002 Aluminum
0.09 ppm
* Scan Sample
Next Test
Previous Test
%T/Abs
Calibrate
Scan Blank
30 COD PLUS COLORIMETER 4/03