GENEQ > Materials testing > Defectograph

Wire Rope Defectograph
Model MD120


An instrument set for non-destructive magnetic testing of wire ropes
The MD120 recording system includes a specially designed portable chart recorder with additional data recording which can be transferred to a computer. This unique instrument has been designed as a helpful and comfortable tool, to meet the special needs of rope experts in industrial environments.

FEATURES
  • Detecting the position of defects throughout the rope's entire length and depth
  • Using mathematical integral method for easier readout of high density defects
  • Zoom replay of recorded defects
  • Diagram solid state memory
  • Computer interface
  • "Settings with rope code" memory

MD120 Defectograph uses today's knowledge and technology to provide the maximum possible information that can be obtained from a rope in situ under non-destructive testing.


SPECIFICATIONS
Rope size range
  • GP series measuring heads diameter from 8 to 85 mm
  • GM series measuring heads diameter from 10 to 90mm
  • LRM series measuring heads diameter from 3 to 165mm
Rope types
Wire ropes made of ferromagnetic steel, any form of construction
Detected rope defects
  • Defects characterised by stepwise changes in rope cross-section, i.e. broken wires, pitting corrosion, etc., are detected using inductive sensors in all heads
  • Darger losses in a rope's metallic cross-section, i.e. wear, corrosion in longer length etc. are detected using additional Hall-effect sensor in GP-1(h), GP-2(h),
    GP-3(h) and GM series heads
  • Real distortion
Able to detect
All important defects to estimate rope deterioration; maximum sensitivity may be as high as 0.05% of nominal rope metallic cross-sectional area (but such defect readability depends on the rope's construction)
Defect positioning on rope length
With rope length converter RI, mounted in heads GP-1 type, GP-2 type, GP-3 type, GM or separate for others
Defect positioning of depth inside rope
With heads equipped with double inductive sensors ("inner" and "outer"), i.e. heads GP-1 type, GP-2 type, GM
Operating conditions
  • Temperature from -25° to + 40° C 
  • For recording on paper from 0° to + 40° C 
  • Relative humidity to 95% 
  • For recording on paper from 25 to 85%
Application range
This instrument is intended to record signals from magnetic sensing heads for testing wire ropes. It may also be direct applied to recording other electric signals within its sensitivity range 1mV/mm to 3.2 V/full scale or it may be customised to record within another required range, from 50 µV/mm.
Main modes
  • Chart feed at constant selectable speed
  • Chart feed synchronous to rope movement
Recording channels
  • 4 measurement channels -
    • 2 channels of inductive sensors (coils) signals,
    • 1 channel of Hall-effect sensor signal,
    • 1 channel of mathematical integration of the inductive signal,
  • Rope length printout in meters by 5 cm of chart,
  • Time marks every 1 second and 10 seconds
  • Printout of recorder settings, rope code settings, time and date
Rope speed range at compensation of speed influence to inductive sensor signals
0.05 to 10 m/s
Displayed rope speed range
0.05 to 9.99 m/s by 0.01m/s, over range indicated
Rope length display range
1 to 9999 m by 1 m reversible, up/down counting option, initial length setting capability
Length converter input
2 x 100 pulses/m (type RI)
Paper chart drive
  • 1, 2, 5, 10 mm/m of rope or 1, 2, 5, 10 mm/second
  • At synchro-feed rope speed should be limited
    • at 1 mm/m to 7.0m/s
    • at 2 mm/m to 7.0m/s
    • at 5 mm/m to 3.6m/s
    • at 10 mm/m to 1.8m/s
  • "Zoom replay" ratio 20 mm/m of rope or mm/s
"Zoom replay" memory capacity
18.75 m of rope or 18.75 seconds of recording
Acoustic signal of rope defect level
10, 20,....to 90% of full scale of the inner sensor channel (beeper and also headphones)
 "Settings & Rope Code" Memory
Capacity 100 items
Indicators
  • liquid crystal display 2 x 40 characters
  • RUN or STOP
  • LED indicator POWER ON
  • LED indicator PAPER OUT
  • multicolour LED indicator of battery charging
Diagram memory (optional Memory Card)
  • Type: SRAM Memory Card PCMCIA type I or II, 
  • Capacity:  512 kB to 4 MB, i.e. 300 to 2400 m of rope at synchro mode or 300 to 2400 seconds (40 min) of recording
  • Recorded data: 3 signal channels + integral channel at sampling rate 2.5 mm or ms recorder settings, rope code, time, date rope length counter
  • Data replaying: Printing selected sectors with MD120 or with computer and software tools 
Required interface for data transfer from diagram memory to the computer
PCMCIA port & professional, byte level software driver
Sensitivity range
Outer and inner coil channels
  • sensitivity at constant chart feed in mm/s and at synchro mode (mm/m), for rope speed 1m/s: 1, 2, 5, 10, 20, 50, 100, 200 mV/mm , at input resistance 21.5 kohm
  • actual sensitivity at synchro mode
    • for rope speed 0.05 to 10m/s depends on: "nominal sensitivity" x "value of rope speed in m/s"
    • at speed less than 0.05 m/s: as for 0.05 m/s (max. sensitivity 1 mV/mm x 0.05 = 0.05 mV/mm)
Hall-effect sensor channel
  • 0.1, 0.2, 0.5, 1, 2, 5, 10, 20 mV/mm
  • differential input voltage with DC component cutting, 0-400 mV
Integral of inductive signal
  • 4 sensitivity levels
  • running integral range 0.1 to 9.99 m or s
Power
  • AC Mains 220 V, 80 VA; other AC Mains voltages on request DC 12 V, 50 W
  • Internal rechargeable battery for 4-6 hours of operation without external power
    • deep discharge protection
    • recharging while external power is connected
Dimensions
47.5 x 37 x 17.5 cm
 Weight
with standard accessories 13 kg