LACO Technologies TITAN Test - 6.4.4 Define evacuation time & vent; Background cleanup

LACO ORIGINAL OPERATING INSTRUCTIONS TITANTEST™
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© 2018 LACO TECHNOLOGIES, INC. - [TitanTest itna01en1-07 BA.fm] - 1807
 Changing the default settings may result in a considerable reduction of
the performance of the device. Consult with LACO Technologies with any
questions.
 Note the default settings.
► To view or change presets, select " Setup > Test settings > Vacuum
ranges".
6.4.4 Define evacuation time & vent
Note the following information for the menu "Evacuation time & Vent".
 In "Sniff" operating mode, you cannot change the settings described here
for "Evacuation time & Vent".
 "Venting: Disabled" or "Venting: manual" prevents the unintentional vent-
ing of vacuum equipment connected to the test port.
 With the setting "Venting: Disabled", it is only possible to flood the test
port by changing the settings in the menu "Evacuation time & Vent".
 With the setting "Venting: manual", you can carry out a targeted venting
operation in the "Standby" window by pressing "Vent". For more informa-
tion, see Chapter 6.2.7: "Standby", page 28, "Venting".
► To view or change presets, select " Setup > Test settings > Evacuation
time & Vent".
Background cleanup "Background cleanup" is an automatic start-stop cycle for breaking down an
increased helium or hydrogen background or to prevent condensates. The
function can only be started with the setting "Venting with STOP".
Damage of turbo pump through permanent gross operation
Gross operation at 15 ... 25 mbar represents a strong load for the turbo
pump.
► Avoid permanent operation in this pressure range.
Table 23: Evacuation and venting settings
Option Value range
(Min. Max.)
Comment
Maximum evacua-
tion time
1s … 30 min,
infinite
If the test object has a gross leak, the pump-down time is longer. The
maximum evacuation time defines the time allowed for the test object
to evacuate to a pressure of 15 mbar. 
If this time is exceed the pump-down operation stops and an error mes-
sage is displayed.
Venting manually Test connection can be vented in the "Standby" window by pressing
"Vent".
with Stop The test port is vented automatically after STOP.
Disabled Venting of the test port in the window "Standby" is disabled.
Background clean-
up
Start-Stop cycles with short intervals for breaking down an increased
helium background.