Hach Eclox, User Manual

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Section 8 Color Test
8.1 Test preparation
• 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.
• The long-path adapter for the low range test shows the color in the tubes from top
to bottom. Make sure the light source is above the tubes during the color match.
8.2
Color, apparent (0–100 APHA platinum cobalt color units)
1. Install the longpath
adapter in the color
comparator box.
2. Fill a tube to the top line
with deionized water or
water that has no color.
3. Put the tube into left
opening of the color
comparator box.