Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 286)

4.10 Dosing and liquid handling
274
PC Control / Touch Control
Single dosing Tandem dosing
V/mL
t/s t/s
V/mL
t
1
t
2
t
1
+ t
2
Filling time
Fig. 4.19: Definition of volume and dosing time
If the dosing rate resulting from the settings cannot be achieved
dosing is carried out at maximum rate.
The following formula can be used to estimate whether the maxi-
mum dosing rate is necessary or not:
2.22 mL/min in rate flow Desired rate Dosing ⋅ =
Note!
This formula applies only for using a single dosing device. The dosing
rate is equal to the flow rate for tandem dosing.
If the required dosing rate exceeds the maximum dosing rate for the
selected exchange or dosing unit (or cylinder volume, see Sec-
tion 3.8.6 ), then a larger cylinder volume must be selected.
Dosing rate / Dosing time – You define the dosing rate and the
time in which dosing is to be carried out. As in the previous case,
the filling times are not taken into account.
Single dosing Tandem dosing
V/mL
t/s t/s
V/mL
t
1
t
2
t
1
+ t
2
Dosing rate
Filling time
Dosing rate
Fig. 4.20: Definition of dosing rate and dosing time