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29.2 Monotonic equivalence point titrations (MET)
29.2.1 Start conditions
The parameters that are carried out before the start of titration are defined under [Start conditions] . The start conditions are processed in the following sequence:
1.
Start volume
2.
Start measured value
3.
Start slope
4.
Pause
Start volume
Volume that is dosed prior to the start of the titration.
Input range
Default value
0.00000 to 9999.99 mL
0.00000 mL
Dosing rate
Rate at which the start volume is dosed.
Input range
Selection
Default value
0.01 to 166.00 mL/min maximum maximum maximum
The maximum dosing rate depends on the cylinder volume (see chapter 32, page 492) .
Pause
Waiting time, e.g. for the electrode to settle down after the start or a reaction time after the dosing of a start volume. The time entered here is only running when all start conditions have been fulfilled.
Input range
Default value
0 to 999999 s
0 s
More start conditions
Start meas. value
Before starting the titration, it will be dosed until this measured value is reached. If the start measured value is reached by the dosing of a start volume, then the titration starts directly.
The values that are actually measurable may vary from the values specified here, depending on the hardware. The binding measurement value ranges can be found in the "Technical specifications" chapter for the control instrument used.
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29.2 Monotonic equivalence point titrations (MET)
Measuring mode pH:
Input range
Selection
Default value
–20.000 to 20.000 off off
Measuring mode U, Ipol:
Input range
Selection
Default value
–2000.0 to 2000.0 mV off off
Measuring mode Upol:
Input range –200.0 to 200.0 µA
Selection
Default value off off
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Start slope
Before starting the titration, it will be dosed until this slope (measured value per volume) is reached. If the start slope is reached by the dosing of a start volume, then the titration starts directly.
Measuring mode pH:
Input range
Selection
Default value
00.000 to 9,999 pH/mL off off
Measuring mode U, Ipol:
Input range
Selection
Default value
0 to 999 mV/mL off off
Measuring mode Upol:
Input range 0 to 99 µA/mL
Selection
Default value off off
Dosing rate
Rate to be dosed with until the start measured value or the start slope is reached.
Input range
Default value
Selection
0.01 to 166.00 mL/min
5.00 mL/min maximum maximum
The maximum dosing rate depends on the cylinder volume
296 ￭￭￭￭￭￭￭￭ 900 Touch Control
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Initial measured value
The [Initial meas. value] is measured before carrying out the start conditions . This value is used for the titration direction determination , which is necessary for the start measured value and stop measured value parameters.
Signal drift
Maximum permissible drift for the measured value acceptance, i.e. maximum change of the measured value per minute. For this value, a suitable maximum waiting time is automatically calculated except you already have modified this waiting time.
Measuring mode pH, U and Ipol:
Input range
Selection
Default value
0.1 to 999.0 mV/min off off off
Measured value acceptance will take place after the maximum waiting time has elapsed.
Measuring mode Upol:
Input range
Selection
Default value
0.01 to 99.90 µA/min off off off
Measured value acceptance will take place after the maximum waiting time has elapsed.
Min. waiting time
The measured value is not accepted until the minimum waiting time has elapsed, even if the signal drift has already been reached. The minimum waiting time is only important for drift-controlled measurements.
Input range
Default value
0 to 999999 s
0 s
Max. waiting time
If the signal drift has been switched off or has not yet been reached, then the measured value will be accepted when the maximum waiting time has elapsed. As default value, a suitable waiting time for the signal drift is automatically calculated.
Input range
Default value
0 to 999999 s
1 s
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Key Features
- Dynamic equivalence point titration (DET)
- Monotonic equivalence point titration (MET)
- Endpoint titration (SET)
- Water determination according to Karl Fischer (KFT)
- Titration with constant maintenance of the measured value (STAT)
- Manual titration (MAT)
- Coulometric water content determination according to Karl Fischer (KFC)
- Bromine index determination (BRC)
- Intuitive touch-sensitive screen for easy operation
- Comprehensive user administration for secure data management