Hach DR/700 Procedures Manual page 634

OZONE,
continued
5.
Collect at least
40 mL of ozone-free
water (blank) in
another 50-mL
beaker.
Note: Ozone-free water
used for the blank may
be demineralized water
or tap water.
8.
Insert the
AccuVac Vial
Adapter into the cell
holder.
6.
Fill one Indigo
Ozone Reagent
AccuVac Ampul with
the sample and one
ampul with the blank.
Note: Keep the tip
immersed while the
ampul fills completely.
9.
Place the sample
AccuVac Ampul into
the cell holder.
Note: Standardization
for this procedure is
intentionally reversed.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
61-78
7.
Quickly invert
both ampuls several
times to mix. Wipe
off any liquid or
fingerprints.
Note: Part of the blue
color will be bleached if
ozone is present.
10.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 and the
zero prompt will turn
off.