Agilent Technologies Helium Leak Detector
36
DRAFT 12
/11/17
Figure 1-15 is a drawing of a Bench Mount Leak Detector with External IDP-15 Dry Scroll
Pump, Model G8612C with individual components shown.
Figure 1-15 Bench Mount Leak Detector with External IDP-15 Dry Scroll Pump, Model
G8612C
1.3.1 Helium
Welding grade helium in a standard cylinder with pressure regulating valve and hose is
required for testing products and leak checking.
1.3.2 Recommended Additional Services
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 8-4 on page 136 and Table 8-6 on
page 138 for the mist eliminator and replacement cartridge part number.
❑ Dry nitrogen vent to keep the test port dry. Refer to Section 8.2 on page 135 for
more information.
❑ Adequate circulation to prevent an increased helium background level.
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