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Varec, Inc. 5
4532 Safety instructions
2.6 Notes on safety conventions and symbols
In order to highlight safety-relevant or alternative operating procedures in the manual,
the following conventions have been used, each indicated by a corresponding symbol in
the margin.
Safety conventions
Warning!
Warning!
A warning highlights actions or procedures which, if not performed
correctly, will lead to personal injury, a safety hazard or destruction of
the instrument
Caution!
Caution!
Caution highlights actions or procedures which, if not performed
correctly, may lead to personal injury or incorrect functioning of the
instrument
Note!
Note!
A note highlights actions or procedures which, if not performed
correctly, may indirectly affect operation or may lead to an instrument
response which is not planned
Explosion protection
Device certified for use in explosion hazardous area
If the device has this symbol embossed on its name plate, it can be
installed in an explosion hazardous area
Explosion hazardous areas
Symbol used in drawings to indicate explosion hazardous areas.
• Devices located in and wiring entering areas with the designation
“explosion hazardous areas” must conform to the stated type of
protection
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion
hazardous areas.
• Devices located in safe areas still require a certificate if their
outputs run into explosion hazardous areas
Explosion protection
Direct voltage
A terminal to which or from which a direct current or voltage may be
applied or supplied
Alternating voltage
A terminal to which or from which an alternating (sine-wave) current or
voltage may be applied or supplied
Grounded terminal
A grounded terminal, which as far as the operator is concerned, is
already grounded by means of an earth grounding system
Protective grounding (earth) terminal
A terminal which must be connected to earth ground prior to making
any other connection to the equipment
Equipotential connection (earth bonding)
A connection made to the plant grounding system which may be of type
e.g. neutral star or equipotential line according to national or company
practice
EX
EX