• 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 and divide it by 5 to obtain mg/L (or ppm) of
Chlorine.
• To measure 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.
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
• Then add to the vial the specific test reagent:
Free Chlorine: 1 packet of
Total Chlorine: 1 packet of
HI 93701-0 Reagent.
HI 93711-0 Reagent.
• Replace the cap and mix.
• In the case of Total Chlorine
determination, wait for 2
minutes to allow reaction
to occur. This is the reacted
sample.
• Remove the cap and insert
the reacted sample into the
right hand opening of the
checker disc.
• 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 replacement kit (100 tests)
HI 93701-03
Free Chlorine replacement kit (300 tests)
HI 93711-01
Total Chlorine replacement kit (100 tests)
HI 93711-03
Total Chlorine replacement kit (300 tests)
HI 740231
20 ml glass cylinders with caps (2 pcs)
DEMI-10
Demineralizer Bottle
