8. Close the lid and press *IOK to
select Scan Blank.
Free Chlorine (T)
* Scan Blank q
16:02:19 01/04/05
9. Removethetubefromthemeter.
Pour off all but a sufficient amount
of sample water to cover a tablet.
Add one *Chlorine DPD #1
Instrument Grade Tablet (6903).
Crush tablet with a tablet crusher
(0175) then add sample water until
the tube is filled to the 10 mL line.
Cap tube and shake until tablet
has dissolved. Solution will turn
pink if free chlorine is present. Wait
15 seconds but no longer than
30 seconds. Mix.
10. Open the meter lid. Insert sample
into chamber. Align the index notch
on the positioning ring with the index
arrow on the meter. Close lid, press
*IOK to select Scan Sample.
Free Chlorine (T)
* Scan Sample
16:02:19 01/04/05
11. Record the result as Free Chlorine. Free Chlorine (T)
1.00 ppm
* Scan Sample q
16:02:19 01/04/05
12. Removethetubefromthe
chamber. Add one *Chlorine
DPD #3 Instrument Grade Tablet
(6197). Crush tablet with Tablet
Crusher (0175). Cap tube and
shake until the tablet dissolves.
An increase in color represents
combined chlorine.
Note: For wastewater samples, Standard Methods for the Examination of W ater and
Wastewater recommends waiting 2 minutes for full color development when
testing total chlorine.
50 CALIBRATION & ANALYSIS • CHLORINE
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