Metrohm 761 SD Compact IC - Manual (Page 87)

5.1 Operation with manual sample change
761 SD Compact IC / Instructions for Use 8. 761.1043
79
2 Calibration
⇒ Dry off the free end of the sample aspirating tubing 3 with a
clean cloth.
⇒ Then immerse it in the lowest MCAL standard (mg/L H
3
PO
4
plus basic content of nitrate and sulfate). The MCAL standard
bottles are supplied as accessories (6.2321.000).
⇒ Start the system by selecting SYSTEM / Control / Start determi-
nation (see Software Instructions for Use «IC Net 2.3», Sections
4.3.3 and 4.3.4). After start, you will see the EDIT SAMPLE
DESCRIPTION: SYSTEMS window. You should make the fol-
lowing entries:
What is important above all is to set menu option Calibration
level to 1.
⇒ After completing this measurement, you should determine the
other 5 MCAL standards one after the other (250, 350, 450,
550 and 650 mg/L H
3
PO
4
plus basic content of nitrate and
sulfate) and, when doing this, increase menu item Calibration
level in window EDIT SAMPLE DESCRIPTION: SYSTEMS in-
crementally by one (this means that the measurement with
the 650 mg/L standard would then be
Calibration level 6).
⇒ In order to check calibration, you should also determine the
MCAL QC check standard with 545 mg/L H
3
PO
4
plus basic
content of nitrate and sulfate at the end of the series of cali-
bration measurements.
⇒ Detailed information on calibration can be found in the Soft-
ware Instructions for Use «IC Net 2.3», Section 7.5.