As per safety norms, Workers working near conveyor belt should be made alert with clear and distinct sound before conveyor belt is started. The alarm should work for at least 30 seconds so that the workers near the belt should move to the safety place. This time can be increased depending upon the situations. This type of Pre-Start Alarm must be installed in every conveyer belt.
In our Pre-Start Alarm, we have used the audio as well as visual indicator for the night.