Metrohm 797 VA Computrace - Manual (Page 260)

8 How to ...?
797 VA Computrace – Software
248
8. Check the Dosing Devices, which are used for standard addi-
tion in the Use field (see Dosing Devices, section 5.2)
9. Close the DOSINOS window by clicking .
10. Click to open the EDIT WORKING METHOD PA-
RAMETERS window.
11. Select the Determination tab (see section 5.2) and enter Sample
identifier , Sample amount , Cell volume , and the number of
standard additions in the No. of additions field (If you work
with the CVS or CPVS mode, see section 6.2 Calibration tech-
niques with CVS and CPVS for a description of the parameters
on the
Determination tab).
12. Select the Substances tab (see section 5.2) and make sure that
for each substance entered in the table the number of the sin-
gle or mixed standard addition solution, its concentration and
its volume is defined. The
No. of the standard solution must be
identical to the number of the Dosing Devices used for auto-
matic addition of this solution.
13. If the standard addition should be done with variable addition
volumes, click the button in the Volume column to open
the EDIT VARIED ADDITION window, enter the variable addi-
tion volumes in the Addition fields, and close this window by
clicking .
14. Close the EDIT WORKING METHOD PARAMETERS window by
clicking .
15. Place the sample solution in the measuring vessel at the 797
VA Computrace stand.
16. Click on or MAIN WINDOW / Window / Monitor to open
the MONITOR window.
17. Start the measurement by clicking the icon in the MAIN
WINDOW or the button in the MONITORING win-
dow.
18. Enter the Sample ID (used as part of the determination file
name) in the PLACE SAMPLE window and click .
8.8 Calibration curve technique
Record calibration curve manually by adding standard solution
This method is used for preparing different calibration solutions by
adding several times a concentrated standard solution to the meas-
uring solution using a pipette. Proceed as follows:
1. Click on or MAIN WINDOW / Mode / Determination .