Monitoring condition of elongated ferrous object having a longitudinal axis

摘要

There is provided an apparatus, a monitoring arrangement, a method, a crane and a tool for monitoring a condition of an elongated ferrous object (502) having a longitudinal axis. Two magnetizing circuits comprising magnetic poles are arranged along the longitudinal axis of the object (502). A magnetic flux guide connects the poles. The magnetizing circuits are arranged around the object (502) at opposite sides along the longitudinal axis, wherein the magnetizing circuits are hinged (517) together to be movable between a closed position, where the object (502) is enclosed between the poles of the magnetizing circuits and an open position, where monitored object (502) is removable from the apparatus. The apparatus comprises an enforcing element (522) operatively connected to the magnetizing circuits such that, in the closed position, the magnetizing circuits are pressed towards each other; and the operative connection between the enforcing element (522) and the magnetizing circuits is caused to disconnect on the basis of detecting a faulty portion of the longitudinal ferrous object (502) by a force received from a faulty portion of the longitudinal ferrous object (502).