Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 211)

4 Parameters
PC Control / Touch Control
199
Note!
A constant measured value is often only achieved after a certain
time, as mixing and possibly the reaction itself require a certain time.
The response time of an electrode can also increase with time, i.e.
reaching a constant measured value takes longer and longer. In such
a case drift-controlled measured value acceptance is particularly
advisable, as the measured values are only accepted when equilib-
rium has almost been achieved.
• Waiting time min. (d): The measured value is not accepted until
the minimum waiting time has elapsed, even if the measured value
drift has already been reached. The minimum waiting time is only
important for drift-controlled measurements.
• Waiting time max. (d): If the signal drift is switched off or has not
yet been reached then the measured value will be accepted after
the maximum waiting time has elapsed. If the waiting time has not
been newly entered then a waiting time that is suitable for the drift
will be calculated automatically according to the following equation:
5 0.01 Drift 150/ time Waiting + + =
Note!
Select titration rate optimal when you are developing a new titra-
tion method. This parameter is suitable for virtually all titrations and
only needs adaptation in special cases.
Parameters for predefined titration rates for DET and MET
Titration rate slow optimal fast
Meas. point density 2 4 6
Min. vol. increment 10.00 μL 10.00 μL 30.00 μL
DET
Max. vol. increment off off off
MET Volume increment 0.05000 mL 0.10000 mL 0.20000 mL
Dosing rate maximum maximum maximum
Measured value drift 20.0 mV/min
20.0 μA/min
50.0 mV/min
50.0 μA/min
80.0 mV/min
80.0 μA/min
Waiting time min. 0 s 0 s 0 s
DET and
MET
Waiting time max. 38 s 26 s 21 s