Advanced settings
7.8.2 Leak Detection: Start-up timer
The start-up timer prevents the leak detector from being used for a pre-determined du-
ration after it has been switched on. This means measurements cannot be made until the
leak detector is thermically stabilized, or while traces of tracer gas remain in the detector.
7.8.3
Leak
D
etection: Background suppression
This function is used to suppress the detector's background.
Note: after calibration, with background suppression function activated, the leak detec-
tor's background will be lower than 5 · 10
-13
Pa·m
3
/s (5 · 10
-12
mbar·l/s).
7.8.4 Leak Detection: Crossover Pressures
In a hard vacuum test, used to define the crossover pressures in the different test modes.
7.8.5 Leak Detection: Calibration
Calibration makes it possible to verify that the detector is properly adjusted to detect the
selected tracer gas and display the correct leak rate value.
From the "Settings" screen, press [Advanced] [Leak Detection].
Start-up timer
Set the start-up timer.
From the "Settings" screen, press [Advanced] [Leak Detection] [Background Supp.].
Activation
Activate the function (’on’ if activated).
This function is recommended for testing very small leaks, which improves mea-
surement and reading.
This function can be used to measure a leak rate 2 decades lower than the detec-
tor's background, when the detector is no longer in roughing.
From the "Settings" screen, press [Advanced] [Leak Detection] [Crossover pressures].
Gross Leak
Set the cross over from Roughing to Gross Leak mode.
Normal
Set the cross over from Gross Leak mode to Normal mode.
NOTICE
Detector calibration
20 minutes after the switched on, the detector suggests that the operator carry out an
auto-calibration (if calibration parameter = ’operator’). For the correct use of the detec-
tor,
this auto-calibration must be performed.
In all situations, a calibration must be
performed:
● at least once a day
● to optimise the measurement reliability for high sensitivity tests
● if it is uncertain whether the detector is working properly
● during intense and continuous operation: start an internal calibration at the beginning
of each work session (e.g. work in teams, every 8 hours).
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