Electro-Chemical Devices (ECD) HCA1 - Manual (Page 7)

2. Remove the used batteries and install 4 new AAA batteries following the
diagram for correct polarity (see diagram). We recommend high quality AAA
alkaline batteries be used.
3. Replace the battery cover. Be sure to tighten the cover securely. Do not over
tighten. This is necessary for meter to be waterproof.
4. Dispose of the used batteries in accordance with your local regulations.
5. Press ZERO/ON button to confirm the meter turns on. The meter is now ready
for operation.
6. Meter will not work if battery orientation is incorrect.
7.
MENU CL1 DPD-1 Free Chlorine Test Procedure
1. Remove (1) Micro CL (DPD-1) Strip from the bottle before beginning the test.
Place it in a dry convenient place and recap the test strip bottle.
2. 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.
3. Press and re-press the MENU button until the display shows the parameter
CL1.
4. 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.
5. Press the ZERO/ON button. The cursor will move across the display followed
by 0.00 PPM. Sample is ready for testing.
6. Dip the HCA1 Strip Micro CL (DPD-1) 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. When testing outdoors
(in sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing
and Reading the sample.
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).
NOTE: N,N-diethyl-p-phenylenediamine (DPD) also reacts to form a magenta color with
Ozone, Total Chlorine, Permanganate, Iodine, and other oxidizers.
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