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DPD-1 Free Chlorine Test Procedure
CL1
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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.
NOTE: N,N-diethyl-p-phenylenediamine (DPD) also reacts to form a magenta color with Ozone, Total Chlorine,
Permanganate, Iodine, and other oxidizers.
*NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample.
REMOVE STRIP
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.
TURN METER ON
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.
SELECT TEST: CL1
Press and re-press the MENU button until the display shows
the parameter CL1.
RINSE AND FILL CELL WITH SAMPLE
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.
ZERO METER*
Press the ZERO/ON button. The cursor will move across the
display followed by 0.00 PPM. Sample is ready for testing.
DIP STRIP AND PRESS "READ"
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.*
RECORD RESULT DISPLAYED
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).
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CL
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