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OX-TRAN Model 2/12 R Operator's Manual
Orienting the Sample
When mounting test samples, orientation can be important. Edge leakage or oxidation on some materials
can affect the test result. It is important to place the "barrier side towards the carrier". Follow the guidelines
below to minimize edge leakage and oxidation effects.
Homogeneous Materials
If you are testing a homogeneous, one-layer sample, the orientation of the sample in the cell
is not critical.
Multi-Layered and Laminated Materials
Install a multilayered film or laminate with the barrier coating or laminate up, toward the top of
the cell. For example, a one-sided, PVDC-coated paper should be mounted with the PVDC
side up, placing the PVDC towards the carrier gas.
Metalized Materials
Insert the film into the test cell with the metalized side towards the carrier gas to prevent
oxidation.
Humidified Testing
The OX-TRAN Model 2/12 R has the capability of generating a controlled RH from 0 to 90% for both the
carrier gas and the test gas. Humidified Carrier and Test Gases are created by moving pressurized gas
through a humidifier filled with HPLC-grade water and mixing the wet gas with a dry gas in the appropriate
ratios.
Caution:
To prevent damage to the system, the water level must not exceed the Fill Line.
Filling the Humidifiers
Before starting a test requiring RH generation the level in the humidifiers should be checked and filled if
necessary. Follow these steps to fill the humidifiers:
Note: Refer to Figure 6-1 for the location of the referenced controls.
1.
Open the door on the instrument to access the Humidifiers.
2.
Check the water levels to determine if there is sufficient water to perform the test.
3.
Fill a syringe with HLPC-grade water and attach a short piece of tubing to the luer fitting.
4.
Push the end of the tubing onto the Fill/Drain Port fitting.
5.
Open the appropriate Drain/Fill Valve by turning it 2-3 turns counterclockwise.
6.
Slowly push in the plunger on the syringe to force the water into the reservoir.
7.
Close the Drain/Fill Valve and remove the syringe.
MOCON, Inc.
Revision L
Testing Flat Films
6-3
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