Hanna Instruments HI 38019 User Manual

Page 2

5 mL

• 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

93711-0 reagent. Re-

place the cap and

mix.

• Wait for 2 minutes to allow reaction to occur. This is the

reacted sample.

• Remove the cap and in-

sert the reacted sample

into the right hand open-

ing of the checker disc.

• Hold the checker disc so

that a light source illumi-

nates 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.

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

REFERENCES

Adaptation of the EPA recommended DPD method 330.5.