INFICON Helium Leak Detector Modul1000 - Manual (Page 64)

6-23
Operation
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6.12.6.2 Main menu
→
Settings
→
Zero & Background
→
Background suppression
Inlet area: In addition to the internal background, after activating the START button
also the background of the inlet area will be deducted from the measured signal. The
value has to be determined using the „Background definition of inlet area“ function in
the „Zero & Background“ menu.
Internal only: The internal background is measured with the activation of the START
button and is deducted from the measured signal.
→
Background definition Inlet Area
The device must comply with the following conditions for this function:
• Vacuum mode
• Vented status (at least 1 minute)
• Inlet port blanked off
• At least 20 minutes have passed since the device was switched on.
→
Zero
The function I•Zero allows to enable the ZERO button only when the leak rate signals
are stable. In this setting, the inclination of the decreasing background signal is
measured. The leak rate signal must be stable enough to detect a leak of the
programmed size of Trigger 1. The I•Zero function is locked as long as the leak rate
signal is not stable enough. (The inclination of the dropping background signal
is > 0.5 x set Trigger level 1.)
6.12.6.3 Main menu
→
Settings
→
Mass
In the "Mass" menu, the tracer gas used for leak detection can be changed. The
following gases are available:
→
H
2
(hydrogen)
→
He (helium)
→ 3
He (helium isotop with mass 3)
6.12.6.4 Main menu
→
Settings
→
Interfaces
In the "Interfaces" menu, the electric interfaces of the Modul1000 can be configured.
Main Menu
→
Settings
→
Interfaces
→
Control location
→
PLC
The Modul1000 is controlled via the digital input. The START, STOP and ZERO
buttons of the device are disabled.