29.15 Dosing and Liquid Handling
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464
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900 Touch Control
￭ 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 22
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
20 mL 45.00 mL/min 50.00 mL/min
50 mL 112.50 mL/min 124.50 mL/min
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