Metrohm tiamo 2.1 (ProcessLab) - Manual (Page 819)

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tiamo 2.1 (ProcessLab) ￭￭￭￭￭￭￭￭ 803
Limit exceeding
Selects the exceeded limit for which a track is to be started.
Selection Lower limit | Upper limit | Any | OK
Default value Any
Any
The track will be started if either the upper or the lower limit is exceeded.
OK
The track is started when the monitored quantities are once again within
the limit values (including hysteresis).
Track name
Selects the track that is to be started automatically.
Selection 'Track name'
Note
If a track is called for that is already running then it will be allowed to
finish and then restarted when it is free again.
5.6.3.8.5 Tandem dosing
Menu item: Method ▶ STAT/ADD/DOS ▶ General/Hardware
If the check box Tandem dosing is activated for the commands STAT,
ADD or DOS, then a second dosing device can be defined in order to enable
continuous dosing. 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.
However, in order to ensure continuous dosing, the following points must
be taken into account:
￭ Keeping filling times short
Use the highest possible filling rate in order to keep the filling times as
short as possible. Please note the viscosity and density of the liquid.
￭ Filling rate with different cylinders
When you use two dosing devices with different cylinder volumes (dosing
cylinder 2 > dosing cylinder 1), then the minimum filling rate of the larger
cylinder 2 must be:
Filling rate 2
≧ Filling rate 1 • (V
Dosing cylinder 2
/V
Dosing cylinder 1
)
￭ Rule for dosing rate
The dosing rate must not exceed 75% of the filling rate of the smaller
cylinder. This corresponds to the following values (at the maximum filling
rate):