Hanna Instruments HI 38020 - Manual (Page 2)

• 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 3875 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 the specific test reagent:
Free Chlorine: 1 packet of
Total Chlorine: 1 packet of
DPD Free Chlorine reagent. DPD Total Chlorine 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
The chemicals contained in this kit may be hazardous if
improperly handled. Read the relevant Health and Safety
Data Sheet before performing this test.
HEALTH AND SAFETY HEALTH AND SAFETY HEALTH AND SAFETY HEALTH AND SAFETY HEALTH AND SAFETY
REFERENCES REFERENCES REFERENCES REFERENCES REFERENCES
Adaptation of the EPA recommended DPD method 330.5.
window directly in mg/L
(or ppm) of Chlorine.
• To measure chlorine in the
0-10.0 mg/L range, re-
move the disc, mirror and
its holder, if pre-installed.
Then install just the
38020 disc as shown here.
• Use the pipette to fill one of the glass vials with 5 mL
of sample. This is the blank; insert it into the left hand
opening of the checker disc.
• Use the pipette to fill the other glass
vial with 2.5 mL of sample (up to the
mark).
• Add demineralized water up to the 15 mL mark and
shake to mix.
• Add then the specific test reagent:
Free Chlorine: 1 packet of
Total Chlorine: 1 packet of
DPD Free Chlorine reagent. DPD Total Chlorine 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.
2.5 mL
• 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. Sus-
pended 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.
5 mL