Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 59)

3 Operation
PC Control / Touch Control
47
Enter the Volume of reagent which is to be dosed in during a rinsing
cycle. The default value is the cylinder volume, i.e. the contents of
one cylinder is dosed in during a rinsing cycle. You can also enter a
different volume.
Select the number of Cycles to be carried out during the
preparation function. At least two rinsing cycles should be carried
out in order to remove all the air bubbles.
Enter the Dosing rate and the Filling rate to be used during the
PREP function for aspirating and ejecting the reagent. Lower rates
should be entered for substances with higher viscosities.
The maximum dosing rate and maximum filling rate for the
exchange unit depend on the cylinder volume:
Cylinder volume Max. rate
1 mL 3.00 mL/min
5 mL 15.00 mL/min
10 mL 30.00 mL/min
20 mL 60.00 mL/min
50 mL 150.00 mL/min
You can always enter a value between 0.01 and 166.00 mL/min
independent of the cylinder volume. When the function is carried out the
rate will be reduced automatically to the highest possible value.
Dosing unit
The parameters apply to the preparation (PREP command) and
emptying (EMPTY command) functions. The preparation and emptying
functions can be found under manual control, which can be started
with the [Manual] fixed key (see Section 3.24.2). In the Device
manager, you can define for each dosing device when a message is to
be shown to remind you that the PREP function must be carried out for
the particular dosing device (see Section 3.10).