Metrohm 899 Coulometer - Manual (Page 102)

10.1 Stirring rate
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899 Coulometer
10 Appendix
10.1 Stirring rate
The stirring rate can be adjusted in steps of –15 to +15.
The approximate rotational speed can be calculated with the following
formula:
Rotational speed/min (r/min) = 125 · stirring rate
Example:
Stirring rate set: 8
Rotational speed in rpm = 125 · 8 = 1000
2000
1500
1000
500
-15 -10 -5 0 5 10 15
r/min
Figure 25 Rotational speed depending on stirring rate
10.2 Balance
The sample size and the associated unit can be sent from a connected bal-
ance. The sample size is transmitted as a number with up to ten charac-
ters (including algebraic sign and decimal point).
Sample size and unit are sent as a single character string. They are separa-
ted by a space character. The string is terminated with the ASCII charac-
ters CR and LF.
If the balance sends a negative sample size (e.g. when you are reweighing
a sample), then the algebraic sign is adopted. The algebraic sign is, how-
ever, ignored for the calculations.