Table of Contents
Advertisement
Testing Film Samples
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, toward the Film
Mounting Plate. For example, a one-sided, PVDC-coated paper should be mounted with the
PVDC side facing the Film Mounting Plate, placing the PVDC towards the carrier gas.
Metalized Materials
Mount the film in the test cartridge with the metalized side towards the carrier gas to prevent
oxidation.
Using a 100% RH Test Gas
The AQUATRAN 3/38 has the capability of using a 100% RH Test Gas. A saturated sponge is used to
generate a 100% RH Test Gas. The saturated sponge is placed in a cavity in the bottom Test Gas plate and
the "Run at 100%" control is set to the ON position.
For information on properly saturating the sponges refer to following section "Using Saturated Sponges".
Using Saturated Sponges for testing at 100% RH
The sponge used for 100% RH testing should be refilled weekly, unless experience dictates refilling more
often when testing high transmitters. Sponges should be very moist, but not dripping.
Caution:
You must use HPLC-grade water in the AQUATRAN 3/38. HPLC-grade water (1
megohm or better) is preferred and can be obtained through local suppliers. If you
do not use HPLC-grade water, scale is likely to form. If this occurs, expensive
repairs will be necessary to fix the problem.
In addition, the use of de-ionized water may result in the inability to achieve the
desired RH.
6-4
Revision G
AQUATRAN 3/38 Operator's Manual
MOCON, Inc.
Advertisement
Table of Contents
