4.4.4.4 gives the meaning colours indicating devices with respect the state of
equipment.4 permitted only, risk
of confusion arises with the meaning Tables 7.3 gives the meaning colours indicating devices with respect the condition
of the process.4.4.3 and the colours are
supplemented with graphical symbols and/or written information provided near the
indicating devices.:
- switch OPEN/CLOSED
- valve CLOSED/OPEN
- motor STOPPED/RUNNING
.SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT 73
Table 7.
Table 7.4. re-establishing the
intended function)
- Pressure/temperature different
from normal level
- Tripping protecting device of
an auxiliary unit
- Conveyor overloaded
- Over-travelling limit switch
- Position change valve a
conveyor belt
- Deep-freezer super freezing
GREEN Normal Normal conditions Optional Authorisation proceed
- Indication normal working
limits
BLUE Mandatory Indication a
condition which
requires action
Mandatory action Instruction the operator enter
preselected values
WHITE
GREY
BLACK
No specific
meaning
assigned
Any meaning, may be
used whenever doubt
exists about the
application RED,
YELLOW, GREEN,
BLUE
Monitoring General information, (e.g.g.g.2 and 7.
Table 7.
Colour Meaning Explanation Action operator Examples application
RED Emergency Dangerous conditions Immediate action deal with
a dangerous condition, e.4 Meaning preferred colours indicating devices with respect the state the
equipment
Colour Meaning Examples application
BLUE Mandatory Indication need enter
- present values
- other modes control
WHITE
GREY
BLACK
No specific meaning
assigned
Status indication, e.
confirmation command,
indication measured values)
Table 7.g.3 Meaning colours indicating devices with respect the condition the process.
The use the colour RED, YELLOW and GREEN place the
preferred colours WHITE, GREY and BLACK Table 7. by:
- operating emergency stop
- opening safety valve
- starting cooling pump
- Pressure temperature out safe
limits
- Voltage drop
- Break down main unit
- Stoppage necessary machines,
service systems
- Deep-freezer temperature too high
- Over-travelling stop position
of hoist
YELLOW Abnormal Abnormal conditions
Impending critical
condition
Monitoring and/or intervention
(e.4
