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Instructions for Use
The following figure is a drawing of a Bench Mount Leak Detector with External IDP-
15 Dry Scroll Pump, Model G8612C with individual components shown.
Figure 13 Bench Mount Leak Detector with External IDP-15 Dry Scroll Pump, Model G8612C
Helium
Welding grade helium in a standard cylinder with pressure regulating valve and
hose is required for testing products and leak checking.
Recommended Additional Service
The following additional services are recommended, 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
the user frequently operates at elevated roughing pressures, pumps on large
volumes, or frequently cycles the system. Refer to Table 29 on page 170 and
Table 31 on page 172 for the mist eliminator and replacement cartridge part
number.
Dry nitrogen vent to keep the test port dry (for more information see
Dry Nitrogen Vent section).
Adequate circulation to prevent an increased helium background level.
34
Agilent Helium Leak Detector User Manual
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