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Horns are audible alarms activated by the output from a relay, programmable controller (PLC), or process control system.


  • To alarm when a part or container is not in the correct position.
  • To alert of a deviation in a process parameter from its set point.
  • To warn that equipment has shut down.
  • To alert when a process set point has been reached.


  • Can be programmable so different alarm sequences give different warnings.
  • Can be located remotely from the process.
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