LaMotte COD3 Plus Operator's Manual page 101

Colorimeter
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PROCEDURE
1. Press and hold
ENTER
2. Press
to select Testing Menu.
3. Select All Tests (or another sequence containing 086 Silica HR) from Testing
Menu.
4. Scroll to and select 086 Silica HR from menu.
5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with sample.
6. Insert tube into chamber, close lid and select Scan Blank.
7.
Remove tube from colorimeter. Add 6 drops *Silica Reagent #1 (V-4466). Cap and
invert to mix.
8. Add 12 drops of *Silica Reagent #2 (V-4467). Cap and mix. Wait 5 minutes.
9. At end of 5 minute waiting period, add 8 drops of *Silica Reagent #3 (V-4468). Cap
and mix.
10. Insert tube into chamber, close lid and select Scan Sample. Record result.
11. Press
to turn colorimeter off or press
make another menu selection.
NOTE: To extend the range to 100 ppm, perform a 2:1 dilution of water sample, with
silica-free water. Perform test and multiply result by 2.
COD3 Plus Colorimeter 10.16
until colorimeter turns on.
EXIT
to exit to a previous menu or
Silica, High Range

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