Lovibond Maxi Direct, Instruction Manual, Page: 142 / 268

140 MaxiDirect_2c 03/2010
1.1 Methods
Ozone,
in absence of Chlorine
with Tablet
0.02 – 2 mg/l O
3
1. Fill a clean vial (24 mm Ø) with 10 ml of the water
sample
, close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber and
empty it,
leaving a few drops remaining in the vial
.
5. Add
one DPD No. 1 tablet
and
one DPD No. 3 tablet
straight from the foil and crush the tablets using a clean
stirring rod.
6. Add water sample to the 10 ml mark.
7. Close the vial tightly with the cap and swirl several times
until the tablets are dissolved.
8. Place the vial in the sample chamber making sure that
the marks are aligned.
9. 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
mg/l Ozone.
Notes:
See page 137.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
Countdown
2:00
0
0
3