YSI 900 Chlorine Colorimeter - Manual (Page 14)

14
Methods
Chlorine with powder pack: 0.1 – 8.0 mg/l
a) Free Chlorine
Fill a clean vial (10 mm ) with
5 ml of the water sample and perform zero
calibration (see “Operation”).
Add the contents of
two 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
Fill a clean vial (10 mm ) with
5 ml of the water sample and perform zero
calibration (see “Operation”).
Add the contents of
two 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 – 6 minutes.
Press the [ZERO/TEST] key.
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:
2 – 3 mg/l: ± 0.2 mg/l
> 3 – 4 mg/l: ± 0.3 mg/l
> 4 – 8 mg/l: ± 0.4 mg/l
Zero
Test
Zero
Test
CL 8
Tablet Powder
CL 8
Tablet Powder
CL 8
Tablet Powder
RESULT
Tablet Powder
RESULT
Tablet Powder
0.0.0
Tablet Powder
0.0.0
Tablet Powder