Metrohm 900 - Page 387

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29 Parameters
900 Touch Control
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371
Selection maximum
Default value maximum
maximum
The maximum filling rate depends on the cylinder volume (see chapter
32, page 492).
However, in order to ensure uninterrupted dosing, the following points
must be taken into account:
￭ Use the highest possible filling rate in order to keep the filling times as
short as possible. The filling rate should be decreased for viscous liq-
uids.
￭ When you use two buret units with different dosing cylinders, the fill-
ing rate for the larger sized cylinder must be at the minimum:
= filling rate in mL/min for the larger sized cylinder
= filling rate in mL/min for the smaller cylinder
= cylinder volume in mL of the buret unit of the second dosing
device
= cylinder volume in mL of the buret unit of the first dosing
device
Example:
Dosing device 1: volume = 20 mL, filling rate = 50 mL/min
Dosing device 2: volume = 50 mL
Filling rate 2 ≥ 50 mL/min · 50 mL / 20 mL ≥ 125 mL/min
￭ The dosing rate must not exceed 75% of the filling rate of the smaller
cylinder. These values are listed in the following table, valid at maxi-
mum filling rate:
Table 16
Maximum dosing rate for different dosing cylinders
Cylinder volume maximum dosing rate
Exchange unit Dosing unit
1 mL 2.25 mL/min –
2 mL – 5.00 mL/min
5 mL 11.25 mL/min 12.50 mL/min
10 mL 22.50 mL/min 25.00 mL/min