Metrohm 900 Touch Control Manual - Manual (Page 504)

32.1 Dosing unit
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
488 ￭￭￭￭￭￭￭￭
900 Touch Control
32 Appendix
32.1 Dosing unit
32.1.1 Maximum dosing and filling rate
The maximum dosing rate and maximum filling rate for the dosing unit
depend on the cylinder volume:
Cylinder volume Maximum rate
2 mL 6.67 mL/min
5 mL 16.67 mL/min
10 mL 33.33 mL/min
20 mL 66.67 mL/min
50 mL 166.00 mL/min
Independent of the cylinder volume, values ranging from 0.01 to 166.00
mL/min can always be entered. When the function is carried out the rate
will be, if necessary, decreased automatically to the highest possible value.
32.1.2 Default parameters for preparing (PREP) and emptying (EMPTY)
The PREP command is used to rinse and fill the cylinder and tubings of
the dosing unit air bubble-free. You should carry out this function before
the first determination or once per day.
The command EMPTY is used to empty the cylinders and the tubings of
the dosing unit.
If no titrant is selected in the command, preparing and emptying will be
carried out with the following default parameters:
￭ The entire cylinder volume is dosed at the maximum dosing rate
through Port 1.
￭ The cylinder is filled at the maximum filling rate through Port 2.
￭ The following dimensions apply for the tubings:
– Tubing at Port 1: length = 40.0 cm, diameter = 2 mm
– Tubing at Port 2: length = 25.0 cm, diameter = 2 mm