The system comprises a central access tube along which magnetic targets are positioned at various locations. Settlement is measured by the relative position of the magnetic targets using a Reed Switch Probe lowered down through the central access casing.
There are several variations to suit individual applications:
- GXM-100 Central access tubing and spider magnets for use in boreholes
- GXM-100P Central access tubing and settlement plates for use in fill
- GXM-100T Central access tubing with telescopic joints for larger movement
- GXM-200 Combined settlement/heave and inclination using inclinometer casing as the access tubing with spider magnets
- GXM-200P Combined settlement/heave and inclination using inclinometer casing as the access tubing with settlement plates
- GXM-200T Combined settlement/heave and inclination using inclinometer casing with telescopic joints for larger movement
- GXM-300 Central access tubing de-bonded by an outer corrugated pipe with magnetic targets
- GXM-300i Combined settlement/heave and inclination using inclinometer casing as the access tubing de-bonded by an outer corrugated pipe with magnetic targets
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