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LX218-Operating-Manual-en1-04-(1908) 7 / 90
In the "Sniffing" operation mode, the tracer gas flows out from the test object and is
extracted with a sniffer probe. The pressure in the test object is greater than the
ambient pressure.
FINE
FINE denotes the connection to the turbo molecular pump for inlet pressures up to 2
mbar. This is also used for the "Sniffing" operation mode.
Forming gas
Forming gas is a collective term for gas mixtures of nitrogen and hydrogen.
GROSS
GROSS donates the connection to the turbo molecular pump with the lowest
sensitivity. This allows high inlet pressures (up to 15 mbar).
Minimum detectable leak rate
The minimum detectable leak rate which can be detected by the leak detector under
ideal conditions (< 5 x 10
-12
mbar l/s).
ULTRA
ULTRA denotes the connection to the turbo molecular pump for the measurement
range with the highest sensitivity at inlet pressures below 0.4 mbar (adjustable).
Background signal
Helium or hydrogen (as part of water) are natural components of air.
Operation mode "Vacuum": Before any leak detection, a certain amount of the
adjusted tracer gas is already in the volume on the surfaces of the test chamber,
supply lines, and even in the leak detector itself. This certain amount of tracer gas
generates a measurement signal which is called the "Background signal". The
ongoing evacuation of the test chamber continuously reduces this background signal.
Operation mode "Sniffing": Ambient air is continuously fed into the leak detector via
the sniffer line. The amount of helium or hydrogen occurring naturally in air creates a
constant background signal.
Foreline pressure
Pressure of the backing pressure between the turbo molecular pump and the backing
pump.
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