29
SECTION 2, continued
5. Press READ. The meter will count from 60 to 0, (67 to 0 if signal
average is on), read the blank, and use it to calculate a correction
factor for the 20 FNU standard measurement. If the dilution water
is ³ 0.5 FNU, E1 will appear when the calibration is calculated (See
Section 2.4.2.3 on page 25 for more dilution water information).
The display will automatically increment to the next standard.
6. Remove the sample cell from the cell compartment.
The turbidity of the dilution water can be “forced” to zero by
pressing the
RIGHT key rather than reading the dilution water. The
display will show “S0 FNU”. Press the
UP key to continue with the
next standard.
7. The display will show “S1” (with the 1 flashing) and 20 FNU or the
value of the S1 standard for the previous calibration. If the value is
incorrect, edit using the arrow keys.
8. Fill a clean sample cell to the line with well mixed 20 FNU
StablCal Standard or 20 FNU formazin standard. Insert the sample
cell into the cell compartment by aligning the orientation mark on
the cell with the mark on the front of the cell compartment. Close
the lid.
9. Press
READ. The instrument will count from 60 to 0 (67 to 0 if signal
average is on), measure the turbidity and store the value. The
display will automatically increment to the next standard.
10. Remove the sample cell from the cell compartment.
11. The display will show “S2” (with the 2 flashing) and “100 FNU” or
the value of the S2 standard for the previous calibration. If the value
is incorrect, edit using the arrow keys.
12. Fill a clean sample cell to the line with well mixed 100 FNU
StablCal Standard or 100 FNU formazin standard. Insert the sample
cell into the cell compartment by aligning the orientation mark on
the cell with the mark on the front of the cell compartment. Close
the lid.
13. Press
READ. The instrument will count from 60 to 0 (67 to 0 if signal
average is on), measure the turbidity, and store the value. The
display will automatically increment to the next standard.
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