Metrohm 746 VA Trace Analyzer User Manual
Page 119
4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-34
4.3.4
Recording the calibration curve
Recording of the calibration curve involves the following steps:
1
Switch to dialog page "MONITORING"
•
Press the yellow <MONITORING> key. The dialog page "MONITORING"
whose header shows the loaded method
CALCRV
appears.
2
Switch the program run mode to
calibration
If the parameter
Run mode
is set to
determination
, proceed as follows:
•
Use the cursor keys to select the field
Run mode
.
•
Press the space bar to enter the edit mode.
•
Press the softkey
<calibr.>
and confirm this entry with the <ENTER>
key.
3
Entry of the sample volume
Enter the sample volume as follows:
•
Use the cursor keys to select the first field below the title
Sample
size/S0
.
•
Press the space bar to enter the edit mode.
•
Enter either
*
or
10 mL
(as preparation for performance of the determi-
nation in section 4.3.5) and confirm this entry with the <ENTER> key.
Although the sample volume for recording the calibration curve is not needed (the
volume of the calibration solutions is defined in the parameter V0.CSoln), the
Sample size/S0 field must not be empty.
4
Start the determination
•
Press the red <START> key.
•
The status display in the header of the dialog page "MONITORING"
switches to
* BUSY *
, the start time of the measurement is entered un-
der
Determination
and the determination is given a standard name,
also formed from the start time. Further, during the measurement the
measurement window is superimposed which shows the current pro-
gram line being executed and the remaining line time.
•
Shortly after the start of the determination, the prompt to add 10 mL of
calibration solution
Pb-1
to the measuring vessel appears on the
screen:
5
Addition of 1
st
calibration solution
•
Remove stopper 25
25 and use a pipette to add 10 mL of calibration
solution
Pb-1
with a mass concentration of 2.5
µµg/L to the measuring
vessel through the pipetting opening. Press the <ENTER> key.
•
The screen shows the prompt to add 1 mL acetate buffer to the measur-
ing vessel:
Ъ
ЪДДД
ДДД MEAS.TASK MESSAGE ДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДД¿
¿
³
³
³
³
³
³
CSOLN Pb-1 10.000 mL > M
³
³
³
³
³
³
А
АДДД
ДДД <Enter>: continue ДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДДЩ
Щ