3 Installation
21
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
3.4.2 Grounding
Under certain conditions, dangerously high voltage can be conducted through a gas directly to an
ungrounded conductor almost as effectively as through a copper wire. The ability of an electric
current to flow through a gas under certain circumstances poses a serious risk. Do not touch the
exposed pins on any gauge installed on a vacuum system when high voltage is present.
If the fitting allows continuous metal-to-metal contact between the housing base and the vacuum
chamber, the module is properly grounded via the fitting. If the fitting requires a rubber gasket,
rubber O-ring, Teflon tape, or other material that prevents metal-to-metal contact between the
housing base and the vacuum chamber, refer to Figure 3-4 and follow these instructions to ground
the module to the vacuum chamber:
• Use a metal hose clamp on the gauge connected by a #12 AWG (minimum size) copper wire to
the grounded vacuum chamber.
When high voltage is present, all exposed conductors of a vacuum
system must be maintained at Earth ground. Improper grounding could
cause product failure, property damage, or serious personal injury.
To reduce the risk of product failure, property damage, or serious personal
injury, follow ground network requirements for the facility.
• Maintain all exposed conductors at earth ground.
• Ground the module housing to the vacuum chamber as instructed below.
• Make sure the vacuum port to which the module is mounted is properly
grounded.
Figure 3-4 Ground Connection to the Vacuum Chamber
Metal hose clamp or other metal clamp
3.31 mm
2
(12 AWG) or larger ground wire
Fitting
Ground lug, bolt, or stud
Vacuum Chamber
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