LaMotte OZONE - DPD LIQUID - Manual (Page 2)

OZONE TEST PROCEDURE - DPD METHOD
Read the 1200 Colorimeter Manual before proceeding. Carefully
wipe tubes dry before inserting into the colorimeter chamber.
FREE AVAILABLE CHLORINE
Push the
READ
button. Record
reading as ppm
Total Residual
Chlorine.
••••••••••••••••••••••
2.55
ZERO
READ
1200 COLORIMETER
8.
Insert the
tube into the
chamber, being
sure to align
the index line
with the arrow
on the meter.
Close the lid.
7.
Cap tube and
invert to mix.
Wipe tube dry.
Make reading
within 30 seconds.
6.
Add 5 drops DPD
#1A Free Chlorine
Reagent (6740),
and 5 drops of
*DPD #1B Free
Chlorine Reagent
(6741).
5.
Remove the tube
and add 5 drops
DPD #3 Total
Chlorine Reagent
(6743). Swirl to
mix.
4.
Push the
READ
button to turn the
meter on. Press
the
ZERO button
and hold it for
2 seconds until
bla
is displayed.
Release the button
to take a zero
reading (0.00 ppm).
••••••••••••••••••••••
ZERO
READ
1200 COLORIMETER
3.
Insert the
tube into the
chamber, being
sure to align
the index line
with the arrow
on the meter.
Close the lid.
This tube is the
blank or zero.
2.
Rinse and fill a
colorimeter tube
(0290) to the
10 mL line with
sample water.
Cap and wipe
dry.
1.