VS Series Helium Mass Spectrometer Leak Detectors
2-22
DRAFT 4/
23/15
2.2.4.3 Auto Sequencer
The auto sequencer is used to automatically perform testing on a part, to maximize testing
throughput and to reduce the chances of accidentally accepting a bad part. The auto
sequencer is used in conjunction with the reject and audio set point settings, which provide
the criteria for pass or fail conditions. Within the auto sequencer feature, there are two
variables that must be set, rough time and test time. The ROUGH TIME setting indicates to
the system the maximum time it is allowed to be in roughing before the test fails. Ideally, the
system goes into the roughing phase and then proceeds to TEST. The TEST TIME setting tells
the system when to perform the test against the set point values. For example, you may set
20 seconds for the TEST TIME. At the end of 20 seconds, the system determines if the part
has passed or not and then makes an indication by either going to VENT (Pass) or going to
HOLD (Fail) and displaying the reject set point failure on the front panel.
❑ Press Auto Sequencer Set-Up on the Menus screen.
The Auto Sequencer Set-Up screen appears (Figure 2-11). The leak detector can be
configured to automatically run through a complete test cycle
(Start/Rough/Test/Vent).
During the test cycle, the system ensures that during the Rough Time the
user-entered pressure transfer set points are met.
A Pass condition is indicated by the system reverting to the Vent mode upon
completion of the test cycle. A Fail condition is indicated by the system reverting to
the Hold mode, and all operating buttons being disabled except Vent. A failed
condition also results in Rejected appearing on the Home screen, along with a reject
set point activation upon completion of the test cycle. The status of the reject set
points are available through the RS-232 line (see Appendix A “Communications
Protocol”).
On completion of an automated test cycle, the leak detector captures the leak rate
signal measured just prior to the end of the automated test cycle. This leak rate
appears on the Home screen until the next test cycle is initiated.
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