Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 287)

4 Parameters
PC Control / Touch Control
275
Flow rate of a single dosing device
The cylinder volume and the filling time of the exchange or dosing
unit must be taken into account for the calculation of the effective
flow rate.
Max. flow rates for different cylinder volumes:
Cylinder volume Max. flow rate
Exchange unit Dosing unit
1 mL approx. 80 mL/h ---
2 mL --- approx. 170 mL/h
5 mL approx. 400 mL/h approx. 430 mL/h
10 mL approx. 800 mL/h approx. 860 mL/h
20 mL approx. 1.6 L/h approx. 1.7 L/h
50 mL approx. 4 L/h approx. 4.3 L/h
Filling times
Filling times are not included in the calculation of the dosing rate by
the Titrando. The filling times (including valve switching) can be es-
timated according to the following formula:
4s t
rate filling Actual
rate filling Maximum
s in time Filling + ⋅ =
t = 20 s (for exchange units)
18 s (for dosing units)
The maximum filling rate depends on the cylinder volume of the ex-
change or dosing unit used (see Section 3.8.6). In the table below
the approximate filling times (including valve switching) are given for
various cylinder volumes (exchange and dosing unit) at different fill-
ing rates:
Cylinder volume Filling time in s
maximum 100 mL/min 50 mL/min 10 mL/min
1 mL 24 / --- --- --- ---
2 mL --- / 22 --- --- ---
5 mL 24 / 22 --- --- 34
10 mL 24 / 22 --- --- 64
20 mL 24 / 22 --- 28 124
50 mL 24 / 22 34 64 304