Metrohm 711 Liquino - Manual (Page 82)

4.4 XDOS mode - controlled dosing
711 Liquino, Instructions for use 76
However, in order to ensure interruption-free dosing the following points
must be taken into account:
•
In order to keep the filling times as short as possible use the highest fill-
ing rate permitted. Take the liquid viscosity and density into account.
• The dosing rate must not exceed 85% of the filling rate value. At the max.
filling rate this corresponds to the following values:
Cylinder volume Max. dosing rate Max. delivery rate
2 mL 5.10 mL/min approx. 300 mL/h
5 mL 12.75 mL/min approx. 760 mL/h
10 mL 25.50 mL/min approx. 1.5 L/h
20 mL 51.00 mL/min approx. 3.0 L/h
50 mL 127.5 mL/min approx. 7.6 L/h
For continuous dosing the dosing rate corresponds to the delivery rate.
Monitoring functions
Further options extend the dosing modes mentioned above so that you can
adapt the dosing process to meet your own individual requirements:
• Temperature control: The built-in temperature measurement input
(Pt100) allows the temperature in a reaction vessel to be monitored dur-
ing the dosing process. The temperature monitoring function allows the
dosing to be interrupted, delayed or terminated if set temperature limits
are exceeded or undercut. In addition, external instruments can be
switched via remote leads.
• Volume control: In order to prevent e.g. a vessel from overflowing it is
possible to set an absolute stop volume which, when reached, immedi-
ately and unconditionally terminates the dosing. This is particularly useful
for Time&Rate dosing, where the volume is not set in advance.
Documentation
For documentation of the dosing procedure a result report, a vol-
ume/temperature curve or measuring point list can be printed out or sent to
a computer. To complete the documentation three lines of identification text
can be entered (see example of report on page 81).
Port occupancy of the dosing units in the XDOS mode
4 2
1 3
Standard occupancy
Port 1
Dosing port
Port 2 Filling port (with dipper tube)
Port 3 empty
Port 4 Waste (for PREP-function)
The port allocation can be altered under
<Parameter> >dosi ng uni t por t
use ' speci al ' .