Hach Eclox, User Manual

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Section 7 Free and Total Chlorine Test
7.1 Test preparation
Important Note: This product has not been evaluated to test for chlorine and
chloramines in medical applications in the United States.
• Analyze samples immediately after collection.
• Put the color disc on the center pin in the color comparator box (numbers to the
front).
• Use sunlight or a lamp as a light source to find the color match with the color
comparator box.
• Rinse the tubes with sample before the test. Rinse the tubes with deionized water
after the test.
• If the color match is between two segments, use the value that is in the middle of
the two segments.
• If the color disc becomes wet internally, pull apart the flat plastic sides to open the
color disc. Remove the thin inner disc. Dry all parts with a soft cloth. Assemble
when fully dry.
• Undissolved reagent does not have an effect on test accuracy.
• For free chlorine, read the result immediately after the reagent is added to prevent
interference from monochloramine. If the sample contains 3.0 mg/L
monochloramine, the free chlorine result increases each minute by 0.1 mg/L.
7.2 Free or total chlorine procedure, 0–3.4 mg/L Cl
2
1. Fill a tube to the first line
(5 mL) with sample. This is
the blank.
2. Put the tube into the left
opening of the color
comparator box.
3. Fill another tube to the
first line (5-mL) with
sample.