LaMotte SMART 2 - Manual (Page 208)

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 73 Ozone DPD)
from TESTING MENU.
5. Scroll to and select 73 Ozone DPD from menu.
6. Rinse a tube (0290) with sample water. Fill to 10 mL with sample.
7. Insert the tube into chamber, close lid and select SCAN BLANK.
8. Remove tube from colorimeter.
9. Add 5 drops *DPD #3 Total Chlorine Reagent (6743). Swirl to mix.
10. Add 5 drops DPD #1 A Free Chlorine Reagent (6740) and 5 drops *DPD
#1B Free Chlorine Reagent (6741).
11. Cap and invert to mix. Make reading within 30 seconds.
12. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result as mg/L ozone.
13. Press
OFF button to turn the meter off or press EXIT button to exit to a
previous menu or make another menu selection
þ NOTES: For best possible results, a blank should be determined to account for
any contribution to the test result by the reagent system. To determine the
reagent blank, follow the above test procedure to scan a distilled or deionized
water blank. Then follow the above procedure to perform the test on a distilled
or deionized water sample. This test result is the reagent blank. Subtract the
reagent blank from all subsequent test results of unknown samples. It is
necessary to determine the reagent blank only when a new lot number of
reagents are obtained.
Ozone-DPD 2/3 Smart2 TEST PROCEDURES 12.08