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12
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This section compares the measurement results of the MX-50 and a Karl Fischer type analyzer with a
plastic sample, which has a comparatively low moisture.
1) Measurement conditions
+ Sample: Plastic (PET)
+ Heating temperature: 180 ºC
+ Number of measurements: 5
+ Analyzers: MX-50 heating and drying method moisture analyzer (A&D)
Karl Fischer method moisture analyzer (KF)
2) Results
Sample
weight
Moisture
Repeatability
Coefficient of
variation
(CV)
Heating time
Analyzer
(g)
(%)
(%)
(%)
(min)
MX-50
10
0.298
0.0045
1.49
6.8
KF
0.3
0.3072
0.0065
2.13
19
*Values for moisture and heating time are averages of 5 measurements. The number of digits is in line with the
displayed values of each device. (Weight is excluded.)
(1) The results showed no significant difference between the two analyzers, indicating that the MX-50
obtained the same results as a Karl Fischer type analyzer.
(2) Furthermore, the MX-50 had a lower coefficient of variance and better repeatability when the same
sample was tested repeatedly.
(3) The MX-50 measured faster. The MX-50 took 6.8 minutes while the KF took 19 minutes, almost 3
times longer. Although not shown in the table above, the KF requires 6 minutes of preparation for
measurement. When set-up time for the unit and the reagent is included, an additional 2 hours is
required.
(4) In summary, the MX-50 can obtain a moisture ratio that is equal to or better than that of the KF when
measuring low-moisture plastics like PET. Furthermore, it was confirmed that the MX-50 has better
reliability (accuracy) and lower variance. Finally, it has much simpler operation and can greatly reduce
measurement time.
2. Measurement report
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Application of the analyzer/A.Measurement samples/2.Report