46
47
Color of Water
# 3
• Fill the second cuvette up to the mark with unfiltered sample and
replace the cap. This is the apparent color.
• Filter 10 mL of sample through a filter with a 0.45 µm membrane into the
third cuvette, up to the 10 mL mark and replace the cap. This is the true
color.
• Insert the apparent color cuvette (# 2) into the instrument and
close the lid.
• Press READ to start the reading.
• The meter displays the value of apparent color in PCU.
• Remove the cuvette, insert the true color cuvette (# 3) into the
instrument and ensure that the notch on the cap is positioned
securely into the groove.
• Press READ to start the reading. The meter displays the value of true color in PCU.
10 mL
# 2
# 3
# 2
Color of Water
COLOR OF WATER
SPECIFICATIONS
Range
0 to 500 PCU (Platinum Cobalt Units)
Resolution
1 PCU
Accuracy
±10 PCU ±5% of reading
Typical EMC
± 1 PCU
Deviation
Light Source
Tungsten lamp with narrow band interference filter @ 420 nm
Method
Adaptation of the
Standard Methods for the Examination of Water and Wastewater,
18
th
edition, Colorimetric Platinum Cobalt method.
REQUIRED ACCESSORIES
0.45 µm membrane for true color measurement.
For other accessories see page 128.
MEASUREMENT PROCEDURE
• Select the
Color of Water method using the procedure described in
the
Method Selection section (see page 12).
• Fill one cuvette up to the mark with deionized water and replace
the cap. This is the blank.
• Place the blank (# 1) into the holder and close the lid.
• Press ZERO key. The meter will show “-0.0-” when the meter is
zeroed and ready for measurement.
• Remove the blank.
10 mL
# 1
# 1
