INFICON STM-2XM 2-Channel Rate/Thickness Monitor - Manual (Page 18)

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STM-2XM Operating Manual
1.2.3 Earth Ground
STM-2XM is connected to earth ground through 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 terminal.
WARNING - Risk Of Electric Shock
Never interrupt the protective earth circuit.
Any interruption of the protective earth circuit inside or
outside STM-2XM, or disconnection of the protective
earth terminal is likely to make STM-2XM dangerous.
This symbol indicates where the protective earth ground
is connected inside STM-2XM. Never unscrew or loosen
this connection.
CAUTION
There are no user serviceable components within the
STM-2XM case.
Refer all maintenance to qualified personnel.