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DESCRIPT ION 



APPLICATION 



The DC Rope Tester MT-75 is used in the field to test for and 

 detect external and internal broken wires, broken cores, defor- 

 mations, abrasion and corrosion in steel wire ropes. It was 

 developed particularly for routine testing of wire ropes in 

 mining, industrial and military applications where safety and 

 hence the detection of anomalies is of paramount importance. 



OPERATION 



A section of the steel rope is magnetically saturated in the 

 longitudinal direction by a strong permanent magnet. Where 

 there is an inhomogeneity in the rope such as a broken wire, a 

 broken core, corrosion or abrasion, the magnetic flux is dis- 

 torted and leakage flux radiates from the rope into the sur- 

 rounding air space. Test coils are positioned close to the rope 

 to sense the leakage flux. The rope is moved which causes the 

 leakage flux to intersect the coils. The changing intersecting 

 flux induces signals in the coils. The signals are conditioned 

 by electronic circuitry and aurally and/or visually displayed 

 by headphones or a recorder. 

 The Rope Tester MT-75 consists of the following items: 



1 ea. Tester Assembly comprising 



1 ea. Magnet Assembly 



1 ea. Signal Conditioning Circuitry 



1 ea. Instrument Case 



2 ea. Hinged Sensors 

 8 ea. Rope Guides 



1 ea. Headphone Set 

 1 ea. Carrying Case 

 1 ea. Operation and Maintenance Manual 



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