• To measure free chlorine in the
0-3.5 mg/L
range,
remove the disc, mirror and its holder, if pre-installed.
Then install just the disc as shown here.
• Use the pipette to fill each glass
vial with 5 mL of sample (up to
the mark) and insert one of them
into the left hand opening of the
checker disc. This is the blank.
• Add to the other vial demineralized water up to the 10
mL mark and shake to mix.
• Add 1 packet of HI 93701-0 Free Chlorine Reagent.
Replace the cap and mix. This is the reacted sample.
• Remove the cap and insert the reacted sample into the
right hand opening of the checker disc.
5 mL
The chemicals contained in this kit may be hazardous if
improperly handled. Read the relevant Safety Data Sheet
before performing this test.
Adaptation of the EPA recommended DPD method 330.5.
References
Safety Data Sheets
• Hold the checker disc so that a light source illuminates
the samples from the back of the windows.
• Keep the checker disc at a distance of 30-40 cm (12-
16") from the eyes to match the color. Rotate the disc
while looking at the color test windows and stop when
you find the color match. Read the value in the result
window directly in mg/L (or ppm) of Chlorine.
For best results:
Perform the reading three times and take the average
value (divide by 3 the sum of the three numbers).
Intensely colored samples will make the color matching
difficult and they should be adequately treated before
performing the test. Suspended matter in large amounts
should be removed by prior filtration.
Caution:
Ultraviolet radiation may cause fading of colors. When
not in use, keep the disc protected from light, in a
cool and dry place.
Interferences:
Bromine, iodine, fluorine, ozone, oxidized manganese
and chromium.
Accessories
HI 93701-01
Free Chlorine reagents for 100 tests
HI 93701-03
Free Chlorine reagents for 300 tests
HI 740231
20 ml glass cylinders with caps (2 pcs)
DEMI-10
Demineralizer Bottle