User Manual
46 47
Color of Water
• 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.
Color of Water
COLOR OF WATER
SPECIFICATIONS
Range 0 to 500 PCU (Platinum Cobalt Units)
Resolution 1 PCU
Accuracy ±10 PCU ±5% of reading at 25 °C
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 the Zero key. The meter will show “-0.0-” when the meter is zeroed and ready for measurement.
• Remove the blank.
# 1
# 1
10 mL
# 3
# 2
10 mL
# 2
# 3