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This is the original version (as it was originally adopted).
The alarm and safety systems for monitoring and protecting mechanical equipment shall meet the following requirements:
Alarm systems
The alarm systems shall be so designed that no failure in the alarm system can result in failure of the apparatus or installation being monitored.
Binary transmitters shall be designed on the quiescent-current principle or on the monitored load-current principle.
Visual alarms shall remain visible until the fault has been remedied; an alarm that has been acknowledged shall be distinguishable from an alarm that has not yet been acknowledged. Each alarm shall also comprise an audible warning. It shall be possible to switch off acoustic alarms. Switching off one acoustic alarm shall not prevent another signal from being set off by another cause.
Exceptions can be permitted in the case of alarm systems comprising less than five measurement points.
Safety systems
Safety systems shall be designed to halt or slow down the operation of the affected equipment, or to warn a permanently-manned station to do so before a critical state is reached.
Binary transmitters shall be designed according to the load-current principle.
If safety systems are not designed to be self-monitoring it shall be possible to check that they are operating correctly .
Safety systems shall be independent of other systems.
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