Hach-Lange 2100P - Portable Turbidimeter Instrument - Manual (Page 23)

Section 2, continued
Page 23
4650098 operation.fm Calibration
7. The display will show “S1” (with the 1 flashing) and 20 NTU 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 NTU StablCal Standard or
20 NTU 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). 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 NTU” 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 NTU StablCal Standard
or 100 NTU 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). The display will automatically increment to the next standard.
14. Remove the sample cell from the cell compartment.
15. The display will show “S3” (with the 3 flashing) and “800 NTU” or the value of
the S3 standard for the previous calibration. If the value is incorrect, edit using
the arrow keys.
16. Fill a clean sample cell to the line with well mixed 800 NTU StablCal Standard
or 800 NTU 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.