Absorbance And Transmittance Measurement; Measurement Notes - Hach 2100AN IS User Manual

7. Read and record the
value when stable.
Note: To print or send
(via RS232) a
measurement record,
push PRINT.

Absorbance and transmittance measurement

Measurement notes

For the best accuracy and reproducibility:
• Absorbance and transmittance can only be measured at 860 nm.
• Set the zero reference point before measurement. Set the zero
reference point again when a measurement is not taken for several
hours as shown in Absorbance and transmittance measurement
procedure on page 28.
• Transmittance and absorbance measurements use the same zero
reference point. Absorbance and transmittance can be measured on a
single sample after setting a zero reference point in one of the two
modes.
• Use a flow cell for measurements. A flow cell is necessary to get the
accuracy and reproducibilty specifications shown in
on page 5.
If a flow cell is not used, use a single indexed sample cell or match
sample cells. Sample cells should be matched using the
Transmittance or Absorbance modes. Refer to
on page 21.
• Refer to Measurement notes
notes.
Specifications
Matching sample cells
on page 25 for more measurement
English 27