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4
IM 704210-01E
Safety Precautions
This instrument is an IEC safety class I instrument (provided with terminal for protective
grounding).
The following general safety precautions must be observed during all phases of operation, service
and repair of this instrument. If this instrument is used in a manner not sepecified in this manual,
the protection provided by this instrument may be impaired. Also, YOKOGAWA Electric
Corporation assumes no liability for the customer’s failure to comply with these requirements.
The following symbols are used on this instrument.
To avoid injury, death of personnel
or damage to the instrument, the
operator must refer to an explanation
in the User’s Manual or Service
Manual.
Alternating current.
ON(power).
OFF(power).
Make sure to comply with the following safety precautions. Not complying might
result in injury, death of personnel or damage to the instrument.
WARNING
Power Supply
Ensure the source voltage matches the voltage of the power supply before turning ON the
power.
Power Cable and Plug
To prevent an electric shock or fire, be sure to use the power cord supplied by
YOKOGAWA. The main power plug must be plugged in an outlet with protective
grounding terminal. Do not invalidate protection by using an extension cord without
protective grounding.
Protective Grounding
Make sure to connect the protective grounding to prevent an electric shock before
turning ON the power.
Necessity of Protective Grounding
Never cut off the internal or external protective grounding wire or disconnect the wiring
of protective grounding terminal. Doing so poses a potential shock hazard.
Defect of Protective Grounding and Fuse
Do not operate the instrument when protective grounding or fuse might be defective.
Do not Operate in an Explosive Atmosphere
Do not operate the instrument in the presence of flammable liquids or vapors. Operation
of any electrical instrument in such an environment constitutes a safety hazard.
Do not Remove any Covers
There are some areas with high voltages. Do not remove any cover if the power supply is
connected. The cover should be removed by qualified personnel only.
External Connection
To ground securely, connect the protective grounding before connecting to measurement
or control unit.