Metrohm 917 User Manual

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31 Appendix
917 Coulometer
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295
31.2 Exchange unit
31.2.1 Maximum dosing and filling rate
The maximum dosing rate and maximum filling rate for the exchange unit
depend on the cylinder volume:
Cylinder volume Maximum rate
1 mL 3.00 mL/min
5 mL 15.00 mL/min
10 mL 30.00 mL/min
20 mL 60.00 mL/min
50 mL 150.00 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.
31.2.2 Default parameters for preparing (PREP)
The PREP command is used to rinse and fill the cylinder and tubings of
the exchange unit air bubble-free. You should carry out this function
before the first determination or once per day.
If no titrant is selected in the command, preparing will be carried out with
the following default parameters:
￭ The entire cylinder volume is dosed twice at the maximum dosing rate.
￭ The cylinder is filled at the maximum filling rate.
31.3 Stirring rate
The stirring rate can be adjusted in steps from –15 to +15.
The approximate rotational speed for the internal magnetic stirrer
(depends on the product version) can be calculated with the following for-
mula:
Rotational speed/min (r/min) = 125 · Stirring rate
Example:
Configured stirring rate: 8
Rotational speed in revolutions per minutes = 125 · 8 = 1,000

Metrohm 917 Specifications

General

Brand	Metrohm
Model	917
Category	Laboratory Equipment
Language	English