Metrohm 900 - Monitored Dosing (DOS)

29.15 Dosing and Liquid Handling
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900 Touch Control
For buret units with integrated data chip, a check is made in the method
run to verify whether the correct titrant has been attached and whether
the type of dosing drive matches. For buret units without an integrated
data chip, the cylinder volume and the type of dosing drive are checked.
For the selected titrant, the validity of the titer, the working life of the
titrant and the time interval for the GLP test of the buret unit are checked
at the start of the determination.
Selection Selection of configured titrants | not defined
Default value not defined
not defined
No check takes place.
29.15.5 Monitored dosing (DOS)
With the DOS command, you can dose and at the same time monitor the
measured value and/or the temperature.
29.15.5.1
Dosing parameters
The parameters for the dosing are defined under [Dosing parameters].
Dosing criteria
Three different dosing types can be selected for the dosing. Two of the
following parameters can be specified:
￭ Volume
￭ Dosing rate
￭ Dosing time
The third parameter is calculated according to the following formula:
Volume = Dosing rate · Dosing time
If continuous dosing is necessary, tandem dosing can be used (see chapter
29.7.8, page 369). Tandem dosing is carried out with a combination of
two dosing devices so that the second dosing device is dosing while the
first one is being filled and vice-versa.
Selection
Volume/Dosing rate | Volume/Dosing time |
Dosing rate/Dosing time
Volume/Dosing rate
Defining the volume to be dosed and and the dosing rate.
Volume/Dosing time
Defining the volume to be dosed and the dosing time.
Dosing rate/Dosing time
Defining the dosing rate and the dosing time.