INFICON UL1000 Helium leak detector - Manual (Page 13)

General Information
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1.3 Introduction
1.3.1 Purpose
The UL1000 and UL1000 Fab are helium leak detectors. These instruments may be
used to detect the location and the size of leaks on objects under test in two different
ways:
• when the test sample has been evacuated first and is sprayed with helium on the
outside. It is required that a vacuum connection is provided between the UL1000
and UL1000 Fab and the test sample (vacuum mode).
or
• when a helium overpressure is provided in the test sample and the test sample is
searched from the outside with a sniffer probe which is attached to the inlet port
(sniffer mode).
For UL1000 use only:
Notice: Pumping condensable gases and steams: When pumping test sample
water vapour that is inside can attain to the fore pump. With the water vapor
that is in the air - especially in humid areas or when using humid or wet test
samples - the acceptable compatibility of water vapor or capacity of water
vapor respectively can be exceeded.
The steam in the oil of the pump condenses when the water vapor rises over the
acceptable value. So the attribute of the oil changes and danger of corrosion occures
for the pump.
While using the leak detector with condensable gases and steams the oil of the fore
pump has to be controlled regularly. So you can recognize a condensation of water
vapor in the pump. Usually the oil is light and lucent. When water vapor is inside it
gets blear and milky at operating state temperature.
When turning the pump off water vapor condensates and rases the part of water in
the oil.
STOP Danger
Caution: Danger of explosion
Hydrogen forms a highly explosive gas mixture with air.
Great caution is necessary when using hydrogen! No smoking, no naked flames,
avoid sparks.
Caution
The UL1000/UL1000 Fab is only allowed to be used as a leak detector. It may not
be used as a pump system (especially not for pumping off aggressive or humid
gasses)