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1.
Leak Rate Timer
– this is the traditional leak testing that allows the user to set the
desired target values of ALT and CAS. Once the Test Set achieves those target
values, the user selects the following Menu sequence in Leak Measure mode:
2.
Main Menu
– Leak Testing, Leak Rate Timer
Wait Time is the duration of time that will allow the Static (Ps) and Pitot (Pt)
pressure(s) to stabilize before beginning the Leak Test measurement cycle.
Note:
Anytime there is compression or expansion of a gas in a closed system there
will be a resulting pressure change because of adiabatic.
a)
The Wait Time is to allow thermal equilibrium “adiabatic” to occur so that the leak
measurement made during
the “Leak Time” phase is truly a result of the system
leak rate and not a result of adiabatic instability.
b) For Low Level Leak testing (< 5,000 ft.) a Wait Time of 1:00 min is recommended.
c) For High Level leak testing (> 10,000 ft. or high ROC) a Wait Time of 5:00 minutes
or more is recommended to allow adiabatic stability to occur.
d) Leak Time is the duration of time that will be used to measure the leak rate. The
value can be changed. Touch the “Leak Time” zone area and a touch screen
keypad will appear allowing the user to re-define the Leak Time (refer to Figure
33).
Figure 33
Leak Rate Timer Results
3.
ATP Leak Test Profiles
– Automated Leak Testing
The user can select the ATP
“Automatic Test Process” Leak Test Profile which defines
the necessary test parameters.
Once the ATP profile has been selected, the user can select RUN and step away,
returning once process completed to observe the leak test results.
The user can select the ATP Leak Test Profile by following this Main Menu sequence:
Main Menu, Leak Testing, ATP Leak Test Profiles, Select Leak Test Profile(s) (refer to
Figure 34).