Yokogawa DR240 - Manual (Page 8)

7 IM DR231-01E
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.
Make sure to comply with the following safety precautions. Noncompliance 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 Cord 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.
Fuse
To prevent a fire, make sure to use fuses with specified standard(current,
voltage, type). Before replacing the fuse, turn OFF the power and
disconnect the power source. Do not use a different fuse or short-circuit
the fuse holder.
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.
Function grounding terminal. This
terminal should not be used as a
“Protective grounding terminal”.
Alternating current.
ON(power).
OFF(power).
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.
Protective grounding terminal.