LaMotte COD3 Plus, Руководство оператора

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COD3 Plus Colorimeter 10.16
COD,
High Range
PROCEDURE
Use COD/UDV adapter.
1. Homogenize sample if necessary.
2. Preheat COD heater block to 150±2°C.
3. Remove cap from COD tube. Hold tube at a 45° angle. Use a volumetric pipet, to
carefully add 2.0 mL sample water allowing the sample to run down the side of the
tube.
4. Cap and mix thoroughly.
5. Rinse the outside of the tube with distilled water. Wipe dry with a paper towel.
6. Repeat steps 3 through 5 using 2.0 mL distilled water. This is the reagent
blank.
7. Place tubes in preheated COD block heater and maintain temperature at 150±2°C
for two hours.
8. At the end of the heating period turn the heater off . Wait 20 minutes for the tubes
to cool to 120°C or less.
9. Remove tubes from block heater. Invert several times to mix.
10. Allow to cool to room temperature.
11. Press and hold until colorimeter turns on.
12. Press
ENTER
to select Testing Menu .
13. Select All Tests (or another sequence containing 031 COD LR ) from Testing
Menu.
14. Scroll to and select 031 COD LR from menu.
15. Wipe the blank tube with a damp towel to remove fi ngerprints and smudges. Wipe
with a dry towel.
16. Insert reagent blank tube into chamber. Select Scan Blank .
17. Remove tube from colorimeter.
18. Insert digested water sample tube into chamber. Select
Scan Sample
. Record
result. For the most accurate results, take three readings on each sample and
average the results.
19. Press to turn colorimeter off or press EXIT to exit to a previous menu or
make another menu selection.
NOTES: Reagents are light sensitive. Unused reagents should be stored in the shipping
container, and in the refrigerator if possible, until needed.
Testing