3 Installation
28
Series 340 Vacuum Gauge Controller
Instruction Manual - 340005 - Rev. D
3.4 System Grounding Procedure
High voltage can couple through a gas to the internal electrodes of a gauge. Do not touch the
exposed pins on any gauge installed on a vacuum system where high voltage is present.
Improper grounding can cause product damage or personal injury.
• Follow ground network requirements for the facility.
• Maintain all exposed conductors at Earth ground.
• Connect the power cord to a properly grounded outlet.
• Make sure the vacuum port to which the gauge is mounted is properly
grounded.
• Connect the gauge envelope to a facility ground. If necessary, use a ground lug
on the flange bolt or a hose clamp connected to the gauge/component.
Touching the pins on the gauge in a high−voltage environment can cause an
electrical discharge through a gas or plasma, resulting in property damage or
personal injury due to electrical shock.
Vent the vacuum chamber to atmospheric pressure and shut OFF power to the
controller before you touch the pins on the gauge.
Figure 3-9
System Grounding Diagram
The placement of a second ground wire (dashed line in Figure 3−9) between the
vacuum chamber and the 340 Vacuum Gauge Controller chassis is NOT safe −
large currents could flow through it.
After each maintenance/service procedure and before operating the controller
and vacuum system, make sure that your vacuum system and controller are
grounded as shown in Figure 3−9.
