Ametek mocon AQUATRAN 3/40 Operator's Manual page 28

Preparing for a Test
Whenever you use the Advanced Test method to test a sample that may take more time to safely purge
than is provided by the initial ReZero state, consider using a Purge state. The settings for the High Purge
mode fields are explained below.
Off
Auto
Manual
Note: When a permeation test is performed using an Auto Test Method the Automatic Purge mode is
always used.
For more information on how the Automatic Purge mode works see Appendix D "Theory of Operation". For
more information on using the Automatic Purge function see the Instrument Help system.
3-4
When the High Purge mode field is set to "Off", a Purge state will not be used. The
default mode is "Off".
When the Purge mode is set to "Auto" the Carrier Gas exhaust of each cell set to
"Auto" is monitored using the Purge Down water vapor sensor. The time required to
reduce the water vapor level (at the exhaust of the cell) to a defined threshold is used
to determine an appropriate time for the Purge state. The duration of the Purge state
will not exceed the value specified in the "High Purge Time" field. After the Purge
state terminates the system will automatically advance to the next Test state.
When the Purge mode is set to "Manual", the amount of time in minutes that the
sample will be purged is specified using the "High Purge Time" field. After the
specified time period has elapsed the system will automatically advance to the next
Test state.
AQUATRAN Model 3/40 Operator's Manual
Revision D MOCON, Inc.