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Preparing for a Test
Using the Reference Check Function
The AQUATRAN Model 3/40 contains a dedicated "Reference" cell that can be used to track instrument
performance. When the "Reference Check" function is enabled a "Reference Test" will be performed
whenever a test is started, and all Test Cells were previously idle. The Reference cell will be examined
during the Test Phase after the Purge, Conditioning and Quick Check states (when present) have
completed.
The Reference cell data is viewed using the Cell Status screen. The Cell Status screen will show the result
for each Reference Cell examination. All transmission rate data will be normalized to a 37.8 °C test
temperature and stated in gm/(pkg • day). A maximum of 365 days of data will be retained and displayed.
The graph contains limit bars at 5% and 10% from the stated value of the Reference Cell.
For more information on how the Reference Check function works see Appendix D "Theory of Operation".
For more information on using the Reference Check function see the Instrument Help system.
Determining When to Stop a Test
The setting used for the "Test Mode" parameter determines how and when a transmission rate test is
stopped (Test Completion). Four different methods of stopping a transmission rate test are provided. The
four methods are: "Continuous", "Standard", "Convergence By Cycles" and "Convergence By Hours".
The Continuous mode executes until manually stopped by an operator. The Standard mode executes for
the number of cell examination cycles specified by the "Number of Cycles" parameter. The Convergence
modes execute until equilibrium is achieved as defined by the convergence parameters.
Unless the characteristics of the test sample are well understood, the continuous mode should be used. If
the test is stopped prematurely the transmission rate reported will not reflect the true transmission rate for
the material. For more detailed information on the "Test Mode" parameter see the Instrument Help system.
Choosing a Test Method
There are three different ways to specify how a permeation test is to be performed. These "Test Methods"
are described briefly in the following section. For more detailed information see the Instrument Help system.
The Auto Test Method
The Auto-Test Method removes most of the requirements for the user to make decisions regarding
test methodology. The Auto-Test Method utilizes an internal rule-set to dynamically optimize test
parameters and an advanced dynamic convergence algorithm. To perform a test the user just needs
to enter the sample identification information and the standard test conditions (Test Temperature
and RH). For more information see "How the Auto-Test Method Works" in Appendix D.
A test performed using the Auto-Test Method may take longer to complete due to stricter
requirements for Test Completion (when a test is stopped). The Auto Test Method does not allow
the flexibility of specifying exactly how the test will be performed.
The Advanced Test Method
3-6
AQUATRAN Model 3/40 Operator's Manual
Revision D
MOCON, Inc.
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