LaMotte SMART3 Colorimeter - Manual (Page 119)

PROCEDURE–FREE CHLORINE
1. Press and hold until colorimeter turns on.
2. Press ENTER to select TESTING MENU.
3. Select ALL TESTS (or another sequence containing 014 Chlorine) from
TESTING MENU.
4. Scroll to and select 014 Chlorine 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 one *Chlorine DPD #1 Instrument Grade
Tablet (6903A). Cap tube and shake for 10 seconds. Invert slowly 5 times.
Solution will turn pink if free chlorine is present.
8. Immediately insert tube into chamber, close lid and select SCAN SAMPLE.
PROCEDURE–COMBINED CHLORINE
9. Add one *Chlorine DPD #3 Instrument Grade Tablet (6197A) to sample from
Step 8 above. Cap tube and shake for 10 seconds. Invert slowly 5 times. An
increase in color represents combined chlorine.
NOTE: For wastewater samples, Standard Methods for the Examination
of Water and Wastewater recommends waiting 2 minutes for full color
development.
10. Insert sample into chamber, close lid and select SCAN SAMPLE. Record result
as Total Chlorine.
11. Subtract free chlorine reading from total chlorine reading to obtain
concentration of combined chlorine.
12. Press the to turn off the colorimeter or press the
EXIT
to exit to a
previous menu or make another menu selection.
SMART3 Test Procedures 11.10 CHLORINE, DPD Tablet
Test P
rocedures