Notes On Safety Conventions And Symbols - Endress+Hauser Levelflex M FMP 40 Operating Instructions Manual

Levelflex M FMP 40 with PROFIBUS-PA
Safety conventions
Explosion protection
Electrical symbols
Endress+Hauser
1.4

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.
Symbol 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
0
Device certified for use in explosion hazardous area
If the Levelflex has this symbol embossed on its name plate it can be installed
in an explosion hazardous area
Explosion hazardous area
-
Symbol used in drawings to indicate explosion hazardous areas.
– Devices located in and wiring entering areas with the designation
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
%
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
"explosion hazardous areas" must conform with the stated type of
protection
explosion hazardous areas.
1 Safety instructions
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