Lightning Audio 7532 manual Device certified for use in explosion hazardous area, Direct voltage

Safety Instructions Radar Tank Gauge

1.5Notes 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

	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
Explosion protection
	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.
Electrical symbols
	%	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

6 Installation and Operations Manual