Metrohm 797 VA Computrace User Manual

Page 261

8.8 Calibration curve technique

797 VA Computrace – Software

249

2. Click on

MAIN WINDOW

/ Window / Working method

specification

to open the

WORKING METHOD SPECIFICATIONS

window.

3. Load the desired method into the

WORKING METHOD SPECIFI-

CATIONS

window (see How to Load a method, section 8.4).

4. Select

Record calibration curve

in the

Calibration

field of the

WORKING METHOD SPECIFICATIONS

window (is not selectable

with the CVS and CPVS mode).

5. Select

Manual

in the

Addition

field of the

WORKING METHOD

SPECIFICATIONS

window.

6. Select

Batch

in the

Technique

field of the

WORKING METHOD

SPECIFICATIONS

window.

7. Click

to open the

EDIT WORKING METHOD PA-

RAMETERS

window.

8. Select

the

Determination

tab (see section 5.2) and enter the

Cell

volume

and the number of additions in the

No. of additions

field.

9. 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 solution, its concentration and its volume
is defined.

10. If the addition of the standard solution should be done with

variable addition volumes, click the button in the

Volume

column to open the

EDIT VARIED ADDITION

window, enter the

variable addition volumes in the

Addition

fields, and close this

window by clicking

11. Close the

EDIT WORKING METHOD PARAMETERS

window by

clicking

12. Place the electrolyte solution (e.g. buffer) in the measuring ves-

sel at the 797 VA Computrace stand.

13. Click on

MAIN WINDOW

/ Window / Monitor

to open

the

MONITOR

window.

14. Start the measurement by clicking the

icon in the

MAIN

WINDOW

or the

button in the

MONITORING

win-

dow.

15. Enter the

Calibration curve id

(used as part of the determination

file name) in the

START CALIBRATION

window and click

16. Each time an addition is required in the

MANUAL ADDITION

window, add the standard solution using a pipette.

Record calibration curve manually with solution exchange

This method is used for recording a calibration curve using different
calibration solutions of known concentration. Proceed as follows: