Document Conventions - Endress+Hauser RN221N Guide Condensé

Document information
1.2

Document conventions

1.2.1 Safety symbols
Symbol Meaning
DANGER!
DANGER This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
WARNING
serious or fatal injury.
CAUTION!
CAUTION This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTE!
This symbol contains information on procedures and other facts which do not result in personal
NOTICE
injury.
1.2.2 Electrical symbols
Symbol Meaning
Direct current
A terminal to which DC voltage is applied or through which direct current flows.
A0011197
Alternating current
A terminal to which alternating voltage is applied or through which alternating current flows.
A0011198
Direct current and alternating current
• A terminal to which alternating voltage or DC voltage is applied.
A0017381
• A terminal through which alternating current or direct current flows.
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a grounding system.
A0011200
Protective ground connection
A terminal which must be connected to ground prior to establishing any other connections.
A0011199
Equipotential connection
A connection that has to be connected to the plant grounding system: This may be a potential
equalization line or a star grounding system depending on national or company codes of practice.
A0011201
ESD - Electrostatic discharge
Protect the terminals against electrostatic discharge. Failure to comply with this instruction can result
in the destruction of parts or malffunction of the electronics.
A0012751
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RN221N
Endress+Hauser