5. Rinse a clean tube (0290) with the
chlorine standard. Fill the tube to
the 10 mL line with the chlorine
standard. Dry tube with a lint-free
cloth. Put on a dry positioning ring.
Cap the tube.
6. Open the meter lid. Insert the tube
into the chamber. Align the index
notch on the positioning ring with
the index arrow on the meter. Close
the lid and press *IOK to select
Scan Blank.
Free Chlorine (L)
* Scan Blank
16:02:19 01/04/05
7. Removethetubefromthemeter.
Add 5 drops of DPD 1A Free
Chlorine Reagent (P-6740) and
mix.
8. Add 5 drops of *DPD 1B Free
Chlorine Reagent (P-6741). Cap
and mix. Read within 30 seconds.
CALIBRATION & ANALYSIS • CHLORINE 65
DPD
1B
DPD
1A
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