INFICON Helium Leak Detector Modul1000 - Manual (Page 41)

Working Modes
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5.5 Sniff mode tips
The Modul1000 Sniffer version can be used as vacuum leak detector or as sniffer
leak detector.
To use it as sniffer leak detector, the optimized sniffer line SL200 has to be
connected to „Sniff“ on the right side of the
Modul1000. In Measuring mode, the
module draws a constant gas flow through the sniffer line. The helium in the gas flow
is indicated as leak rate.
In Sniff mode, the detection limit is restricted to 1×10
-7
mbarl/s due to the high atmos-
pheric helium background.
The gas flow rate though the sniffer line is approximately 25 sccm.
It is electrically connected by the "ACCESSORIES“ connector.
The operating mode must be set to "Sniff mode".
In "SNIFF"-mode, the red LED on the sniffer handle indicates a bad test sample and
the green LED indicates a good test sample.
The active push-button on the sniffer handle of the sniffer line can be used for switch-
ing on the external background suppression. If the push-button is pressed for a
longer time (3 seconds), the external background suppression is switched off again.