Measuring Heads
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During
testing the sensing head ensures that the running sector of the wire rope
is brought to a condition close to magnetic saturation and provides signals
from its sensors to the MD120B tester. Sensors in the head detect magnetic
leakage flux due to external or internal defects in the rope, these defects
can be as small as 0.05 % of the rope's cross-sectional area. Heads are
intended to detect localized losses, e.g. from broken wires and pitting
corrosion; to detect distributed loss of metallic cross-sectional area,
due to corrosion, wear and abrasion; and to estimate the depth of the
localized loss position inside the rope. Test results are not affected
by plastic coating, grease, etc.
Zawada
measuring heads apply four categories of sensors in its heads: • One-channel inductive system, a single coil system used in small heads to correctly detect localized losses. • Two-channel mixed system, a single coil system and Hall-effect sensing system used in medium heads to detect localized losses and the distributed loss of metallic cross-sectional area. • Two-channel inductive system, a double coil system used in large heads to correctly detect localised losses and to estimate the depth of the position of the localized loss inside the rope. |
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Full three-channel system, a double coil system and Hall-effect sensing
system used in large heads to detect localized losses; to estimate the
depth of the position of localized losses inside rope and to detect the
distributed loss of metallic cross-sectional area.
Zawada
manufactures various types of measuring heads for different applications: • GP Standard Measuring Head – for 8 to 85mm diameter rope • GM Measuring Head – for 10 to 90mm diameter rope • LRM-MH Large Measuring Head – for up to 165mm diameter rope • LRM-SAG Measuring Head – for flat rope and conveyer belts |
Others
Zawada Products:
• MD-20
& MD-25 Portable Wire Rope Tester
• MD-120B
Wire Rope Defectograph
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