ORBECO SP600, Instruction Manual, Page: 79 / 334

77
SP600 Spectrophotometer 01/2008
1.1 Methods
13. Remove the vial from the sample chamber. Empty the
vial, rinse vial and cap several times and then fill with
a
2-3 drops of water sample .
14. Add one DPD No. 1 tablet straight from the foil and
crush the tablet using a clean stirring rod.
15. Add water sample to the 10 ml mark.
16. Close the vial tightly with the cap and swirl several
times until the tablet is dissolved.
17. Place the vial in the sample chamber making sure that
the marks are aligned.
18. Press TEST key.
19. Remove the vial from the sample chamber.
20. Add
one DPD No. 3 tablet
straight from the foil to the
same water sample and crush the tablet using a clean
stirring rod.
21. Close the vial tightly with the cap and swirl several
times until the tablet is dissolved.
22. Place the vial in the sample chamber making sure that
the marks are aligned.
23. Press TEST key.
Wait for a reaction period of 2 minutes .
After the reaction period is finished the measurement starts
automatically.
The result is shown in the display in:
as Chlorine dioxide in mg/l Chlorine,
or
as Chlorine dioxide in mg/l ClO
2
.
mg/l free Chlorine
mg/l combined Chlorine
mg/l total Chlorine
Notes:
See next page.
T1 accepted
prepare T2
press TEST
Countdown
2:00
T2 accepted
prepare T3
press TEST
*,** mg/l free Cl
*,** mg/l comb. Cl
*,** mg/l total Cl
*,** mg/l ClO
2
[Cl]
*,** mg/l ClO
2