6
DPD-1 Free Chlorine Test Procedure
NOTE:
N,N-diethyl-p-phenylenediamine (DPD) also reacts to form a magenta color with Ozone, Total Chlorine,
Permanganate, Iodine, and other oxidizers.
DO NOT
discard the sample from the Free Chlorine test if you are planning to run
HHWT-486638 (DPD-3) Total Chlorine Procedure. Move directly to steps 8-10 on page 7.
Otherwise, rinse the cell immediately.
Remove one (1)
HHWT-486637
strip from the bottle before
beginning the test. Set the strip in a dry, convenient place
and recap the bottle immediately.
REMOVE STRIP
Press the
ZERO/ON
button to power the meter on; the display
will show all annunciators, then the current MENU selection,
followed by the last reading.
TURN METER ON
Dip the
HHWT-486637
strip into the CELL and immediately
press READ. This starts the
20 SECOND
countdown timer.
During this time move the strip in a gentle back and forth motion
(approx. 2 strokes/Sec).
Remove and discard the strip after
“1” on the display disappears.*
DIP STRIP AND PRESS “READ”
Press the
ZERO/ON
button. The cursor will move across the
display followed by
0.00 PPM
. Sample is ready for testing.
ZERO METER*
Rinse the
CELL
at least 3 times with the water sample you will
be testing - rinsing minimizes the potential for cross-
contamination from a previous test. Finally, fill cell to capacity
(4mL) with the water sample.
RINSE AND FILL CELL WITH SAMPLE
Press and re-press the
MENU
button until the display shows
the parameter
CL1
.
SELECT TEST: CL1
CL1
1
2
6
7
The cursor will move across the display while the meter
prepares to measure the sample. Record result displayed
(this result is automatically stored in CL1 Menu).
RECORD RESULT DISPLAYED
5
4
3
CL
*
NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample.
