YSI 900 Chlorine Colorimeter - Manual (Page 12)

12
Methods
Chlorine with powder pack: 0.02 – 2.0 mg/l
a) Free Chlorine
Fill a clean vial (24 mm Ø) with
10 ml of the water sample and perform zero
calibration (see “Operation”).
Remove the vial from the sample chamber.
Add the contents of
one Chlorine Free-DpD/F10 powder pack straight from the
foil into the water sample.
Close the vial tightly with the cap and invert several times to mix the contents (20
sec.).
Place the vial in the sample chamber making sure that the marks are aligned.
Press the [ZERO/TEST] key.
The method symbol flashes for approx. 3 seconds.
The result is shown in the display in mg/l free Chlorine.
b) total Chlorine
Remove the vial from the sample chamber.
Rinse the vial and the cap several times and then fill the vial with
10 ml of water sample (Note 2 and 3).
Add the contents of
one Chlorine total-DpD/F10 powder pack straight from the
foil into the water sample.
Close the vial tightly with the cap and invert several times to mix the contents (20
sec.).
Place the vial in the sample chamber making sure that the marks are aligned.
Wait for a reaction period of 3 minutes.
(Countdown can be activated, see page 7)
The method symbol flashes for approx. 3 seconds.
The result is shown in the display in mg/l total Chlorine.
c) Combined Chlorine
combined Chlorine = total Chlorine – free Chlorine
Tolerances:
0 – 1 mg/l: ± 0.05 mg/l
> 1 – 2 mg/l: ± 0.10 mg/l
!
Zero
Test
Zero
Test
CL 2
Tablet Powder
CL 2
Tablet Powder
CL 2
Tablet Powder
0.0.0
Tablet Powder
RESULT
Tablet Powder
RESULT
Tablet Powder