Oil Leak Detector NAR 300 system
8 Endress+Hauser
1.8 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.
Symble Meaning
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 highlights actions or procedures which, if not performed correctly, may
lead to personal injury or incorrect functioning of the instrument
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
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 with 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
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
1 Safety instruction
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