Detailed Introduction to the Parameter Setting of PERME W3/060 Water Vapor Transmission Rate Tester

PERME W3/060 Water Vapor Transmission Rate Tester is a fully automatic and highly precise computer-control tester. When testing specimens of different transmission quantities, parameter selection would influence accuracy of testing results directly. There are three selections in “Test Control”, namely, Controlling Parameter, Testing Parameter and Chamber Parameter. Hereinafter would introduce the setting methods of them.

1. Controlling Parameter
1.1 Testing Interval: it’s the time interval of data display of the two successive water vapor transmission cups. The unit of testing interval is Minute. Different testing intervals are for different films so as to improve testing efficiency and accuracy. As to high barrier property materials, we recommend 60 minutes and above. Since their transmission quantities are small and no obvious weight change can be achieved within a limited time period, insufficient interval setting would lead to great errors. As to low barrier property materials, shorter intervals, such as 10 or 20 minutes, etc., can be selected so as to improve testing efficiency.
1.2 Testing Humidity
It’s the humidity difference between the two sides of the film. Usually, it’s stated in standards as 90%RH. When testing water vapor transmission property, humidity would be an important factor affecting transmission quantity. This value is preset as per your relative humidity needs. This Parameter should be confirmed before every testing.
1.3 Testing Temperature
Testing Temperature is also an important index. It’s defined as the set temperature for this individual testing. This parameter should also be confirmed before each testing.

2. Testing Parameters
2.1 Testing Methods: this is for standard selection or method selection for this individual test. The selected Testing Method would be printed in the testing report.
2.2 Testing Material: material name of every water vapor transmission cup should be input for future data inquiry and reporting printing.
2.3 Testing Area: This time should be selected cautiously. We have preset the default value, yet the change of testing area of this individual test needs to change the value here. Since the value would be calculated for final testing results, this parameter/value should be confirmed before each test.
2.4 Specimen Thickness: should also be accurately set, since this parameter would be calculated for the testing results. Inaccurate thickness value would lead to result errors.

3. Chamber Parameters
3.1 Select The Chamber: this should be chosen after all the settings for the chamber are chosen. If a chamber doesn’t test, there is no need to choose. Correspondingly, this chamber will not be weighed during testing.
3.2 Testing Mode: there are three modes under the Testing Mode, namely Standard Mode, Proportion Mode and Continuous Mode.
? Standard Mode: if this mode is selected, the cycling times should be set. When the preset cycling time has been achieved, the instrument stops testing automatically.
? Proportion Mode: compare the results of two successive weighing; and when the differential has realized the preset proportions, the test ends automatically.
? Successive Mode: the instrument system will end only when manually press the stop button. Otherwise, the test would go on.
3.3 Cycling Time: the weighing time(s) set in the Standard Mode to stop testing.
3.4 Proportion Judgment: proportion of differential changes in Proportion Mode. The test will end when less than the preset value.

4. Parameter Setting Order
When set the parameters, the selected testing chamber should be clicked with mouse. Then, set the corresponding Controlling Parameters, Testing Parameters and Chamber Parameters. After setting, select 'Select the Chamber', set the individual chamber parameter and select. Finally, click 'Start' to complete parameter setting.

Conclusion: via correct parameter setting, testing efficiency and accuracy can be improved, and testing failure can be reduced.