ProMinent DULCOTEST DT1B Operating Manual page 34

Analysis methods
13. Fill a cuvette with a few drops of
a water sample
[DPD No. 1] tablet
14. Insert a
directly from the foil into the
water sample and crush the
[DPD No. 1] tablet with a stirring
rod
15. Fill the cuvette up to the 10 ml
marking with the water sample
16. Close the cuvette using the cuv‐
ette lid
17. Mix the contents of the cuvette
by tipping it back and forth, until
the tablet has dissolved
18. Position the cuvette in the
sample chamber
ð Observe the correct posi‐
tioning of the cuvette.
19. Press the key
[METHOD] flashes for
ð
approximately 3 seconds.
The display value
of free chlorine plus chlorine
dioxide) appears in the dis‐
play.
20. Remove the cuvette from the
sample chamber
[DPD No. 3] tablet
21. Insert a
directly from the foil into the
same water sample and crush
[DPD No. 3] tablet with a
the
stirring rod
22. Close the cuvette using the cuv‐
ette lid
34
[ZERO/TEST]
[A] (sum
23. Mix the contents of the cuvette
by tipping it back and forth, until
the tablet has dissolved
24. Position the cuvette in the
sample chamber
ð Observe the correct posi‐
tioning of the cuvette.
25. Switch the countdown on, see
Ä „ Switching the countdown
function on" on page 14 . To do
this, press the
[ZERO/TEST] key
ð Wait for the 2 minutes reac‐
tion time to elapse
26. The METHOD symbol flashes
for approximately 3 seconds
ð The display value
of free chlorine plus com‐
bined chlorine plus chlorine
dioxide) appears in the dis‐
play.
27. Calculation:
Chlorine dioxide (mg/l) =
n
display value
Free chlorine (mg/l) = dis‐
n
play value
[G]
value
Combined chlorine (mg/l) =
n
display value
play value
[!] and
[C] (sum
[G] x 1.9
[A] minus display
[C] minus dis‐
[A]