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Audio/Visual Indication To EN 981

Visual Audio
Colour Meaning Characteristics Configuration of time
-With variable frequency
DANGER - ON/OFF, continuous or alternating
RED Urgent intervention to -Series of sounds - ON/OFF, alternating
save or protect -Alternate tone (two or three - ON/OFF, continuous or alternating
frequency intervals
Yellow / Orange -Alternating ON/OFF, which must be
clearly different from “”EMERGENCY
ATTENTION One sound only with a constant EVACUATION”
Orange Intervention when necessary spectrum, minimum duration: 0.3s “Max 2 different “”ON”” segment lengths
can be in” the configuration; the first one is
to be long
COMMAND
Blue Compulsory intervention required -Two or three different sounds, -ON/OFF, continuous or alternating
each of them with a constant
spectrum
White / ANNOUNCEMENT / -Ringing tone consisting of two -Non-repetitive high-low (followed by
INFORMATION
Clear Instruction to the public tones instructions)
-Continuous, at least 30s
END OF ALARM
Green -Sound with consistent spectrum - Signal which follows one previous alarm
Situation: Out of danger
signal
Process Condition Indicator Colours To EN 60073
Colour Meaning Explanation Operator Actions Application
-Pressure/temperature out of safe
Immediate action to deal limits
with a dangerous condition
by, eg; -Voltage drop
RED Emergency Dangerous conditions - Activate emergncy stop -Breakdown of a ”main”” unit”
-Breakdown of critical control systems
- Opening safety valve
-Freezer temperature too high
- Start cooling pump
-Stop position over travel on a hoist
Yellow / Orange -Pressure/temperature different from
normal levels
-Tripping of a protective device or
auxiliary unit
Unusual Abnormal conditions Monitoring and/or inter- -Conveyor overload
vention (reset intended
Orange Conditions Impending critical condition function) -Over travel of a limit switch
-Position change of a valve or convey-
or belt
-Freezer on ”super” freeze

Green Normal Normal conditions Optional -Authorisation to proceed
-Indication of normal working limits

Blue Mandatory Indication of a condition Mandatory actiuon Instruction to operator to enter
that requires action
preselected values
White / No specific Any meaning; may be used Instruction to operator
whenever doubt exists
Clear meaning as- Red, Yellow, Green, Blue Mandatory actiuon to enter preselected
about the application of
signed

164 AUCKLAND 09-579 1990 WELLINGTON 04-499 3591 CHRISTCHURCH 03-366 0017
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