How The Automatic Purge Function Works; How The Automatic Conditioning Function Works - Ametek mocon AQUATRAN 3/40 Operator's Manual

Theory of Operation

How the Automatic Purge Function Works

The Automatic Purge function determines an appropriate Purge Time by monitoring the amount of water
vapor in the Carrier Gas exhaust of the Test Cell. The water vapor in the exhaust of each test cell is
measured using dedicated Purge Down sensors.
The Automatic Purge function is implemented as a variation on the standard Purge State. The Automatic
Purge state contains a measurement interval and a purge interval.
When an Automatic mode Purge State is initiated a "count up" timer is displayed. While the count-up timer
is displayed the water vapor level in the Test Cell exhaust is monitored using the Purge Down sensor. When
the water vapor level falls below a defined threshold the measurement interval is terminated.
The elapsed time is used to calculate a time for the purge interval. At the beginning of the purge interval a
count-down timer is initialized and displayed using the calculated Purge Time.
The purge interval will not exceed the value specified in the High Purge Time field. If the calculated Purge
Time exceeds the specified time, the High Purge Time will be used for the purge interval.

How the Automatic Conditioning Function Works

The Automatic Conditioning function determines an appropriate Conditioning Time by monitoring the
amount of water vapor in the Carrier Gas exhaust of the Test Cell. The water vapor in the exhaust of each
test cell is measured using the dedicated Purge Down sensors.
The Automatic Conditioning function is implemented as a variation on the standard Conditioning State. The
Automatic Conditioning state contains a measurement interval and a conditioning interval.
When an Automatic mode Conditioning State is initiated a "count up" timer is displayed. While the count-up
timer is displayed the water vapor level in the Test Cell exhaust is monitored using the Purge Down sensor.
When the water vapor level falls below a defined threshold the measurement interval is terminated.
The elapsed time is used to calculate the appropriate time for the conditioning interval. At the beginning of
the conditioning interval a count-down timer is initialized and displayed using the calculated Conditioning
Time.
If the water vapor level at the test cell exhaust does not reach the threshold in the time specified by the
Conditioning Failure Time field, the test will be terminated and set to the "Failed" state.
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AQUATRAN Model 3/40 Operator's Manual
Revision D MOCON, Inc.