System Description

The LRM®-XXI Diagnostic System for wire ropes and tubes NDT / NDE is based on the principle of saturation of steel rope section with the use of permanent magnets and obtaining the Loss of Metallic Area (LMA) traces and Local Flaw (LF) traces.

The use of the LMA sensor is essential in this wire rope NDT / NDE testing device for indication of a rope weakening due to internal and external corrosion, wear and other structural changes occurring on a length of a rope. LF Sensors detect local changes in a rope structure, eg. due to corrosion or broken wires. Flaws are detected in a whole cross section of a rope.


fd - Local decrease of tested rope metallic cross section area.
s - length of gap between wires ends.
r - eccentrity of damade location.


Shape of signals from OUT LF Sensor (left)
Shape of signals from INN LF Sensor (right)
Shape of signals from LMA Sensor.


Indicates the most weakness rope parts by the LRM®-XXI Diagnostic System.


The LRM® - XXI Diagnostic System for testing steel ropes.

Diagnostic System for testing steel ropes.

The LRM® - XXI Diagnostic System consists of:

LRM®-MH Measuring Heads

Designed for round or flat ropes testing, which as a standard comprise:

  • LMA sensor for detecting long changes in the rope cross-section due to corrosion and abrasion effects, lack of wires in the tested section of the rope
  • LF sensors for detecting local changes, e.g. broken wires, section loss, corrosion pits and other local rope damage.


LRM®-XXI Recorder

The microprocessor diagnostic devices, enabling recording, storage and processing of diagnostic signals from LRM® Measuring Heads. LRM®XXI Recorder is equipped with:

  • The LCD display indicating direction, speed and length of testing.
  • ­The keyboard enabling control of testing process.
  • ­Built-in memory for 10km of testing results in a speed range  from 0,1m/s to 5m/s (optionally from 0.001m/s).
  • A speed compensation system of testing, for reducing the influence of speed on amplitude of signals from LF sensors.
  • Connection between LRM®XXI Recorder and LRM® Measuring Head via LRM® Signal cable (length 1-30m) equipped with fast detachable connectors.
  • Connection to visualization device via RS232 cable or USB Cable (optionally via Wi-Fi connection).
  • ­Built-in battery enabling 12h continuous work. Charging of battery by 12v charger(optionally system of quickly charging - 90% of capacity of battery in 1h).
  • ­Battery level LED indicator.
  • Plastic housing, providing high protection against mechanical damage.
  • ­All external elements(housing, sockets, switches) providing IP67 degree of protection.

LRMRope Software

  • Diagnostic computer software for the visualisation in real time of the collected data from LRM®XXI Recorder. LRM®XXI-Rope enabling remote control of LRM®XXIRecorder work parameters. LRM®XXI-Rope has lots of functions, facilitating visualisation, evaluation and elaboration of collected data.  

LRMTube Software

  • For on line visualization testing of tubes, data storage and analysis of results on computer