INFICON Sensistor ILS500 Leak Detection System - Manual (Page 40)

40 Using the ILS500
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8 Using the ILS500
8.1 Test Sequence
Warning
Ensure that the tracer gas supply pressure (feeding the ILS500 tracer gas inlet) is
set up properly.
Caution
To abort a test sequence and reset to standby, press STOP for 3 s.
Notice The following description is an example for illustration only. The design of
the text fixture, the use of probe(s) and tooling functions etc. should be
adapted to suit your particular application.
Step Comment
1 Standby ILS500 is idle waiting for Start Signal.
2 Tooling Connection Four Air Valves and four Proximity Switch Inputs can
be set up to control moderate test fixtures. Controller
can be expanded for more demanding fixtures.
3 Pre Evacuation
Gross Leak Test 1-
Evacuation Timeout The air is evacuated from the test object and a first
gross leak test is made simultaneously. The Gross
Leak tests are used to detect larger leaks by pressure
changes.
Evacuation is often necessary to ensure that the
Tracer Gas reaches all parts of the tested object, and
to secure that the tracer gas concentration as high as
possible.
Applicable for:
• very long objects (e.g. pipes or heat exchangers).
• low fill pressures (<1 atm).
Less appropriate:
• if the test object does not tolerate underpressure.
• at higher test pressures (Fill Setpoint).
4 Gross Leak Test 2-
Vacuum Decay Test Can be used to reveal leaks before filling with gas.
This minimizes spillage from gross leaks.