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 (T)
* Scan Blank
16:02:19 01/04/05
7. Removethetubefromthemeter.
Pour off all but a sufficient amount
of chlorine standard to cover a
tablet. Add one *Chlorine DPD #1
Instrument Grade Tablet (6903).
Crush tablet with a tablet crusher
(0175), then add chlorine standard
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.
8. Open the meter lid. Insert tube 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 Blank
16:02:19 01/04/05
9. Observe the result. Total Chlorine (T)
1.00 ppm
* Scan Sample
16:02:19 01/04/05
10. Press to scroll to Calibrate. Press
*IOK to select Calibrate.
Total Chlorine (T)
1.25 ppm
* Calibrate ~
16:02:19 01/04/05
11. Use the or to change the
highlighted digits on the display to
match the concentration of the
chlorine standard. Press *IOK to
accept a digit and move to the next
digit.
Calibrate
01.25
q , Q , p
16:02:19 01/04/05
62 CALIBRATION & ANALYSIS • CHLORINE
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