9.
Switch the countdown on, see
function on’ on page 13. To do
this, press the
[!] and
[ZERO/TEST] key
ð
Wait for the 2 minutes reac‐
tion time to elapse
10. The METHOD symbol flashes
for approximately 3 seconds
ð
The result in mg/l of total
chlorine appears in the dis‐
play.
c) combined chlorine
Combined chlorine = total chlorine
minus free chlorine
Calculate the combined chlorine
d) Chlorine together with chlorine
dioxide
1.
Fill a cuvette with a 10 ml water
sample
2.
Insert a
[GLYCINE] tablet
directly from the foil into the
water sample and crush the
[GLYCINE] tablet with a stirring
rod
3.
Close the cuvette with the cuv‐
ette lid and mix the contents by
tipping back and forth until the
tablet has dissolved
4.
In a second 24 mm cuvette add
a 10 ml water sample and carry
out a zero correction, see
5.
Remove the cuvette from the
sample chamber for the zero
correction and empty the cuv‐
ette out
6.
Insert a
[DPD No. 1] tablet
directly from the foil into the
water sample and crush the
[DPD No. 1] tablet with a stirring
rod
7.
Pour the contents of the first
cuvette (
[GLYCINE] solution)
into the prepared cuvette
8.
Close the cuvette with the cuv‐
ette lid and mix the contents by
tipping back and forth until the
tablet has dissolved
9.
Place the cuvette in the sample
chamber
ð
Observe the correct posi‐
tioning of the cuvette.
10. Press the key
[ZERO/TEST]
ð
[METHOD] flashes for
approximately 3 seconds.
The display value
[G]
(chlorine dioxide) reappears
in the display.
11. Remove the cuvette from the
sample chamber
12. Thoroughly clean the cuvette
and the cuvette lid
Analysis methods
26