Metrohm 746 VA Trace Analyzer - Manual (Page 181)

5.3 Set Up
746 VA Trace Analyzer / 747 VA Stand
5-30
Parameter Range; Default value / Meaning
Rot.speed 0, 200, 400, ..., 3000 /min; 2000 /min
Rotational speed of stirrer
Setting of the rotational speed of the stirrer for manual operation
(revolutions/min).
Drop size 1...9; 5
Drop size of the HMDE
Setting of the drop size of the HMDE (Hanging Mercury Drop Elec-
trode) for manual operation.
The surface area of the mercury drop is 0.15...0.60 mm 2 , depending
on the setting.
Drop size 1...9; 5
Drop size of the SMDE
Setting of the drop size of the SMDE (Static Mercury Drop Electrode)
for manual operation.
The surface area of the mercury drop is 0.15...0.60 mm 2 , depending
on the setting.
The time for formation of the drop is:
Drop time t.drop = Drop size × 40 ms
Rot.speed 0, 200, 400, ..., 3000 /min; 2000 /min
Rotational speed of RDE
Setting of the rotational speed of the RDE (Rotating Disk Electrode) for
manual operation (revolutions/min).
V.meas max 1...999 mL; 80 mL
Maximum fill volume
Setting of the maximum fill volume for the measuring vessel of the 747
VA Stand. It must be ensured here that the measuring vessel is not
overfilled. In dispensing operations which would lead to this volume
being exceeded, an error message appears.
The following settings are recommended:
Measuring vessel V.meas max Measuring vessel V.meas max
6.1415.210 80 mL 6.1450.210 80 mL
6.1415.150 70 mL 6.1456.210 80 mL
6.1418.220 70 mL 6.1457.210 80 mL
V.rinse 1...999 mL; 8 mL
Rinse volume
Setting of the rinse volume for manual rinsing of the measuring vessel
triggered by the softkey
.
V.standby 1...999 mL; 0 mL
Standby volume
Setting of the volume of rinsing solution which is filled into the meas-
uring vessel after manual rinsing triggered by the softkey
meas.v.> or at the end of a determination containing a RINSE com-
mand. This volume can be used as conditioning solution for the
electrodes.