LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 117)

PROCEDURE
1. Press and hold ON button until colorimeter turns on.
2. Press ENTER to start.
3. Press ENTER to select TESTING MENU.
4. Select ALL TESTS (or another sequence containing 24 Silica Hi)
from TESTING MENU.
5. Scroll to and select 24 Silica Hi from menu.
6. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample.
7. Insert tube into chamber, close lid and select SCAN BLANK.
8. Remove tube from colorimeter. Add 6 drops *Silica Reagent #1 (V-4466).
Cap and invert to mix.
9. Add 12 drops of *Silica Reagent #2 (V-4467). Cap and mix. Wait 5
minutes.
10. At end of 5 minute waiting period, add 8 drops of *Silica Reagent #3
(V-4468). Cap and mix.
11. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result.
12. Press
OFF button to turn colorimeter off or press EXIT button to exit to a
previous menu or 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.
SILICA - HIGH RANGE 2/2 COD PLUS TEST PROCEDURES 6/02