Lightning Audio 7532 - Manual (Page 6)

Safety Instructions Radar Tank Gauge
6 Installation and Operations Manual
1.5 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
Explosion protection
Electrical symbols
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 7532 RTG 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
“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