Prothermo NMT 538
Hauser Systems & Gauging
5
Caution!
•
No instrument should be sent back for repair without all dangerous material being completely
removed first, e.g. in scratches or diffused through plastic.
•
Incomplete cleaning of the instrument may result in waste disposal or cause harm to personnel
(burns, etc.). Any costs arising from this will be charged to the operator of the instruments.
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.
Protection from line noise.
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
instruments.
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.
Device certified for use in explosion hazardous area
If the Micropilot 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 area.
- 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 grounded (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
EX
EX
Explosion protection
Safety conventions
Electrical Symbols
1 Safety instructions
