Using the ‘Digit Select’ and ‘Digit Increment’ buttons, enter a “0” to set the polarity to low or a “1” to
set the polarity too high. Press the ‘Enter’ button to save.
NOTE: Alarms triggered on the display will also be shown triggered on the printout if the optional
printer is connected.
5.4 Setting the Test Method
There are several ways the analyzer can be used to measure residual gas in the headspace of MAP
packaged products.
The available test methods are:
TIMED
PEAK/VALLEY
AUTOSENSE/CONTINUOUS
5.4.1 Timed
With the timed test method, the test time duration is user-selectable. When the test is started by
pressing the green ‘TEST’ button, the test will run for a fixed period. The reading is displayed during
the test and then remains frozen, so the values can be recorded. The internal sampling pump will stop
at the end of the test time duration. The test time duration can be defined by the user in the Page 1
menu.
Test time duration calculation:
The GS6000 analyzers have an approximate flow rate of 60cc/min (1cc/second). Estimate the
available headspace volume in cubic centimeters in the package or container to be tested. This number
is the approximate maximum test time duration in seconds. For example, if there is 30cc available
headspace in the package or container, the maximum test time duration is 30 seconds. It is important
not to exceed the maximum calculated test time to avoid the following:
1. Drawing product (particulates, liquids, etc.) into the sampling system.
2. Creating a vacuum within the package or container causing ambient air ingress.
3. Deadheading the pump (blocking the flow).
By default, the test time is set for 20 seconds. Use the menu system (refer to section 3.3) to get to
the “teSt” (Test) parameters on Page 1 as shown below:
Using the ‘Digit Select’ and ‘Digit Increment’ buttons, set a new test time in seconds. Press the ‘Enter’
button to save.
5.4.2 Peak/Valley
In the Peak/Valley test method, the final test result represents a peak or valley reading detected during
the test time.
In the Peak/Valley set up page, the test parameters for O
2
and CO
2
can be set. The Peak/Valley is
referenced to a normal air measurement, namely 20.9% for O
2
and 0.0% for CO
2
. If the package gas
is normally lower than 20.9% O
2
and higher than 0.0% CO
2
, then the test should be set up for ‘valley’
on O
2
and ‘peak’ on CO
2
. It should be set up on Page 1 in “nodE” (mode) menu.
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