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
*
I
OK
to select
Scan Blank
.
F r e e C h l o r i n e
( T )
* S c a n B l a n k
1 6 : 0 2 : 1 9
0 1 / 0 4 / 0 5
7. Remove the tube from the meter.
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
*
I
OK
to select
Scan Sample
.
F r e e C h l o r i n e
( T )
* S c a n B l a n k
1 6 : 0 2 : 1 9
0 1 / 0 4 / 0 5
9. Observe the result.
T o t a l C h l o r i n e
( T )
1 . 0 0
p p m
* S c a n S a m p l e
1 6 : 0 2 : 1 9
0 1 / 0 4 / 0 5
10. Press
to scroll to Calibrate. Press
*
I
OK
to select
Calibrate
.
T o t a l C h l o r i n e
( T )
1 . 2 5
p p m
* C a l i b r a t e
~
1 6 : 0 2 : 1 9
0 1 / 0 4 / 0 5
11. Use the
or
to change the
highlighted digits on the display to
match the concentration of the
chlorine standard. Press
*
I
OK
to
accept a digit and move to the next
digit.
C a l i b r a t e
0 1 . 2 5
q
,
Q
,
p
1 6 : 0 2 : 1 9
0 1 / 0 4 / 0 5
62
CALIBRATION & ANALYSIS • CHLORINE
0
Summary of Contents for 1964-EPA
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