Metrohm tiamo 1.2 Manual - Handbuch (Seite 543)

Commands 517
DOS
Command for controlled dosing with possibility for monitoring of measured
value and temperature.
Principle
A predefined volume of a solution is dosed with the DOS command. The meas-
ured value and the temperature can be monitored simultaneously. Three different
types of dosing modes can be chosen by defining two parameters from the fol-
lowing:
Volume , Dosing rate and Dosing time . The third parameter is calculated ac-
cording to the following formula:
Volume = Dosing time • Dosing rate
If continuous dosing is required, a tandem dosing setup can be used i. e. dosing
is carried out with a combination of two dosing devices. The second dosing de-
vice is dosing while the first one is being filled and vice versa.
Commands
Depending on the measured value one of the following two DOS commands can
be chosen:
• DOS pH
Controlled dosing with measurement quantity pH.
• DOS U
Controlled dosing with measurement quantity U.
DOS pH
Command for controlled dosing with measured value pH.
Devices
This command can be executed with the following devices which have the DOS
pH mode:
Titrino: 718, 736, 751, 799
Titrando: 835, 836, 842, 855, 857
Appearance
The command has the following appearance:
Parameters
The parameters for the command DOS pH are configured in the following 5 tabs:
• General/Hardware
Parameters for devices, dosing devices, sensors and stirrers.
•
Dosing parameters
Parameters for the dosing settings.
•
Stop conditions
Definition of conditions which cause the stop of the dosing.
• Monitoring
Definition of measured value and temperature monitoring.