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7. Slowly put 250 mL of
8. After the sample
the sample in the inlet
flow stops and the
reservoir.
display stabilizes, read
and record the value.
Note: To print or send
(via RS232) a
measurement record,
push PRINT.
Color measurement
Measurement notes
For the best accuracy and reproducibility:
• Calibrate the instrument for color measurement using a blank solution
(deionized water) and a known standard (15 or 500 CU) as shown in
Color measurement and calibration procedure
15 CU standard—Use for calibration when low-color concentrations
are to be measured. To make a 15 CU standard, add deionized water
to 15 mL of the 500 CU standard from Hach until 500 mL. A flow cell
must be used to do a calibration with a 15 CU standard.
500 CU standard—Use for calibration when color concentrations
greater than 30 CU are to be measured. Use the 500 CU standard
from Hach for the 500 CU standard.
30 English
• Set the zero reference point before measurement when a
• Color, transmittance and absorbance measurements use the same
on page 31.
• Use a flow cell for measurements. A flow cell is necessary to get the
• Refer to
measurement is not taken for several hours as shown in
measurement and calibration procedure
zero reference point. Color, transmittance and absorbance can be
measured on a single sample after setting a zero reference point in
one of the three modes.
accuracy and reproducibilty specifications shown in
on page 5. Use of a Flow Cell is especially important when low-level
color is measured.
If a flow cell is not used, match sample cells using the Transmittance
or Absorbance modes. Refer to
Measurement notes
on page 26 for more measurement
notes.
Color
on page 31.
Specifications
Matching sample cells
on page 22.
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