LaMotte 1200 Colorimeter - Manual (Page 34)

CHLORINE TEST PROCEDURE - DPD METHOD
Read the 1200 Colorimeter Manual before proceeding. Carefully
wipe tubes dry before inserting into the colorimeter chamber.
FREE AVAILABLE CHLORINE
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.
8.
5.
3. 4.
Fill the Water
Sample Collecting
Bottle (0688) with
sample water. This
will be used to
dispense sample
water for the tests.
Rinse and fill a
colorimeter tube
(0290) to the 10
mL line with
sample water.
Cap and wipe
dry.
1. 2.
I200
COLORIMETER
••••••••••••••••••
READ
bla
ZERO
7.
CAL
I200
COLORIMETER
••••••••••••••••••
READ
Align the index line
with the arrow on
the meter, insert
tube into chamber.
Close the lid. Push
the button.
Record results as
ppm Free Available
Chlorine.
READ
Remove the tube and
add 5 drops DPD #1A
Free Chlorine Reagent
(6740), and 5 drops of
*DPD #1B Free
Chlorine Reagent
(6741).
6.
Cap and invert to
mix. Wipe tube dry.
Make readings
within 30 seconds.
Push the
button to turn the
meter on. Press the
button and
hold it for 2 seconds
until
is
displayed. Release
the button to take a
zero reading
(0.00 ppm).
READ
ZERO
bla
Save sample for the
Total Residual
Chlorine Test.
Proceed to Step 9.