Safety Conventions - Endress+Hauser TMD 834 Betriebsanleitung

Notes on Safety
Safety
conventions
Explosion
protection
Electrical
symbols
26

Safety conventions

In order to highlight safety-relevant or alternative operating procedures in the manual,
the following conventions have been used, each indicated by the corresponding icon
in the margin.
Symbol Meaning
A note highlights actions or procedures which, if not performed correctly, may indirectly
affect operation or lead to an instrument response which is not planned
A caution highlights actions or procedures which, if not performed correctly, may lead to
A warning highlights actions or procedures which, if not performed correctly, will lead to
personal injury, a safety hazard or destruction of the instrument
If the device has this symbol embossed on its name plate it can be installed in an explosion
Symbol used in drawings to indicate explosion hazardous areas.
Devices located in and wiring entering areas with the designation "explosion hazardous
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
A terminal to which or from which a direct current or voltage may be applied or supplied
A terminal to which or from which an alternating (sine-wave) current or voltage may be
A grounded terminal, which as far as the operator is concerned, is already grounded by
A terminal which must be connected to earth ground prior to making any other connection to
A connection made to the plant grounding system which may be of type e.g. neutral star or
Note !
Caution !
personal injury or incorrect functioning of the instrument
Warning !
Device certified for use in explosion hazardous area
hazardous area
Explosion hazardous area
areas" must conform with the stated type of protection
Safe area (non explosion hazardous area)
hazardous areas.
Direct voltage
Alternating voltage
applied or supplied
Grounded terminal
means of an earth grounding system
Protective ground (earth) terminal
the equipment
Equipotential connection (earth bonding)
equipotential line according to national or company practice
TMD 834