ProMinent DULCOTEST DT1B Operating Manual page 26

Analysis methods
17. Place the cuvette in the sample
chamber
ð Observe the correct posi‐
tioning of the cuvette.
18. 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
19. The METHOD symbol flashes
for approximately 3 seconds
ð The result in mg/l of Total
chlorine = display value
appears in the display.
20. Calculation:
Ozone (mg/l) = (Display
n
[A] minus display
value
[G] ) x 0.67
value
Measuring tolerances when
determining the chlorine con‐
tent:
0 ... 1 mg/l: ± 0.05 mg/l
–
> 1 ... 2 mg/l: ± 0.10 mg/l
–
> 2 ... 3 mg/l: ± 0.20 mg/l
–
> 3 ... 4 mg/l: ± 0.30 mg/l
–
26
[!] and
[G]
Bromine with liquid reagents 0.02 ... 9
mg/l
[MODE] key to select [Br] .
Use the
1. In a 24 mm cuvette add a 10 ml
water sample and carry out a
zero correction, see
Ä „Switching on and zero cor‐
rection" on page 13
2. Remove the cuvette from the
sample chamber and empty the
cuvette completely
3. Hold the dropping bottle upright
and by slow pressing, add equal
sized drops into the cuvette:
6 drops ➨ DPD 1 buffer sol‐
n
ution
2 drops ➨ DPD 1 reagent
n
solution
3 drops ➨ DPD 3 solution
n
Fill the cuvette up to the 10 ml
marking with the water sample
4. Use the cuvette lid to seal the
cuvette
5. Mix the contents of the cuvette
by tipping it back and forth
6. Position the cuvette in the
sample chamber
ð Observe the correct posi‐
tioning of the cuvette.
7. Switch the countdown on, see
Ä „ Switching the countdown
function on" on page 14 . To do
[!] and [ZERO/TEST]
this, press
ð Wait for the 2 minutes reac‐
tion time to elapse