INFICON XTM/2 Thin Film Deposition Monitor - Manual (Page 19)

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XTM/2 Operating Manual
1.1.3 Earth Ground
This instrument is connected to earth via a sealed three-core (three-conductor)
power cable, which must be plugged into a socket outlet with a protective earth
terminal. Extension cables must always have three conductors, including a
protective earth conductor.
WARNING
Never interrupt the protective earth circuit.
Any interruption of the protective earth connection
inside or outside the instrument, or disconnection of
the protective earth terminal is likely to make the
instrument dangerous.
This symbol indicates where the protective earth
ground is connected inside the instrument. Never
unscrew or loosen this connection.