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Subject: Wire rope break detection

Date: 05/05/01 at 2:22 PM
Posted by: Jim Elliot
E-mail: jim@jelliot.freeserve.co.uk
Message Posted:

Can anyone advise a UK supplier of fork type inductive proximity detector.
The application is to detect wire rope passing between the forks. If the
rope is present, then the system is healthy, no wire rope e.g. broken, then system failed.
The wire rope is about 12mm diameter, the fork sensor would need to be about 400mm length as the rope moves across a drum as the drum rotates and the rope unwinds. The gap
between the forks would need to be about 200mm.
Any other suggestions as to how to detect wire rope breakage would be appreciated.
The rope comes off a drum horizontally and pulls a bridge/scraper along the length of a rectangular tank. The rope moves across the drum as the rope unwinds. I have
tried using rollers sitting on top of the roped operating limit switches, but this leads to nuisance tripping, as the rope is not under very much tension and stretches and sags quite a bit. This leads to the rope jerking & bouncing, eventually the limit switch operates and tripping the starter.

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