Hach-Lange 2100 AN Laboratory Turbidimeter User Manual - Manual (Page 29)

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:
• 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.
• Color, transmittance and absorbance measurements use the same
zero reference point. Color, absorbance and transmittance can be
measured on a single sample after setting a zero reference point in
one of the three modes.
• Use a flow cell for measurements. A flow cell is necessary to get the
accuracy and reproducibilty specifications shown in Specifications
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
Matching sample cells
on page 21.
• Refer to Measurement notes on page 25 for more measurement
notes.
English 27