Helium; Recommended Additional Services; Storage - Agilent Technologies VS Series Operation Manual

1.3.2 Helium

Welding grade helium in a standard cylinder with pressure regulating valve and hose is
required for testing products and leak checking.

1.3.3 Recommended Additional Services

The following additional services are recommended, as good vacuum practice, based on
the application:
Connect an exhaust hose to the foreline pump and vent it outside of the room, or to
the facility's exhaust, to reduce the particulate count and the helium background
signal.
When using oil lubricated mechanical pumps, use an oil mist eliminator on the
exhaust port of the mechanical pump to reduce the oil mist from the exhaust. Oil
mist eliminators can, however, become saturated with oil causing slower pumping
speeds and higher helium backgrounds in the leak detector. The replacement time
interval of the oil mist eliminator is determined by whether you frequently operate at
elevated roughing pressures, pumps on large volumes, or frequently cycles the
system. Refer to Table 4-4 on page 4-6 and Table 4-5 on page 4-7 for the mist
eliminator and replacement cartridge part number.
Use a dry nitrogen purge for venting or elevating the foreline pressure to keep the
test system dry. Refer to Section 4.2 on page 4-5 for more information.
Adequate circulation to prevent an increased helium background level.

1.3.4 Storage

If the VS Series Component leak detector Base and Display units are not used immediately,
it can be stored as received without special precautions. A dry, relatively dust-free area is
preferred. The required environmental conditions for storage are:
0% to 95% relative humidity, non-condensing
-20 °C (-4 °F) to + 60 °C (+ 140 °F) ambient temperature
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VS Series Component Leak Detector