Measurement Methods - Xylem SI Analytics AVS 370 Manual De Instrucciones

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4.7.1.2 Measurement methods

Enter the individual measuring parameters in this area:
Method
Here, you select among "Sample", "t " and "Constant". Usually, "Sample" is selected if a sample is to
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be measured. In the case of polymer solutions, the additional blind value "t " is required to determine
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the running time of the pure solvent in a viscometer. For measurements of t there will be a query at
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the end of the measurement, whether the determined value should be saved in the database of the
respective viscometer. The value of the calibration constant can be checked by means of the
"Constant" method. For this, a sample of known viscosity must be measured. The viscosity value must
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be entered to the right below "Sample Parameters" in the field "Kin.Viscosity [mm /s] ". In order to
determine the calibration constant, you must ensure exact tempering of the sample (control of bath
temperature!). Just like with the determination of blind values, there will be a query at the end of the
measurement, whether the determined value should be saved in the database of the respective
viscometer
Number of Measurement
Defines the number of running times to be measured for a sample.
The value can be selected between 1 and 10.
Pre-tempering time
Defines the pre-tempering time in minutes. The value can be selected between 1 and 20 minutes.
During the pre-tempering phase, the liquid is suctioned up into the measuring sphere after 1 minute,
similar to a measurement: The movement accelerates the heat transfer and therefore the temperature
adaptation between the sample and the thermostat bath.
Bath-temperature [°C]
The value entered here is used for documentation purposes. This value is not transferred to the bath
thermostat as a nominal value.
Max. Deviation [%]
The value indicated here is the max. deviation allowed between the median value and the individual
running times. If this value is exceeded, one or more repeated measurement (s) will be conducted.
Measurements with deviating measuring results will be identified as outliers by a mathematical
algorithm (outlier test) and will not be used for further evaluations (median value of running times and
all subsequent calculations).
HC-Correction
When this box is selected, the running times are corrected as per Hagenbach-Couette.
The Hagenbach-Couette correction depends on the viscometer type used and on the running time.
Printer-Protocol
The results are printed on the selected standard printer after the measurement and the evaluation.
Autom. Rinsing
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For AVS 370 vsystems with waste system and connected burettes for the rinsing with solvents: If this
parameter is selected, the sample is automatically suctioned after the measurement and the
viscometer is rinsed with solvent as per the selected rinsing parameters. If "Automatic rinse" is not
activated, and if burettes are connected, you can manually activate rinsing with solvents by pressing
"Rinse". The advantage here is that the sample will not be disposed of after the measuring results
have been evaluated so that a repeated measurement is possible.