Magnetic Soil Extensometer
The Geosense® GEO-XM settlement system is used typically to monitor settlement and heave in foundations, excavations and embankments. Settlement is identified at the depth/position where the settlement has occurred and as well as measuring the total amount of settlement.
The GEO-XM soil extensometer comprises a series of magnetic targets positioned so that they move freely outside flush jointed access casing or inclinometer casing. The targets may be 3 or 6 Leaf “Spider” targets, magnetic settlement plates or magnetic joints.
Settlement is measured by the relative position of the magnetic targets using a Reed Switch Probe that detects the magnets lowered down through the central access casing. Inclination where desired is measured using a portable inclinometer
Features of Soil Extensometer
- Measures Total & Incremental Settlement
- Simple to Install
- Can be used with standard Reed Switch Probe
Applications of Soil Extensometer
- Excavations
- Embankments
- Dams
- Tunnels
- Foundations
GEO-XM Settlement layouts
GXM-100 Series Specifications
GXM-100, 100P & 100T use un-keyed access casing to monitor only settlement or heave in foundations.
Access Casing Specifications |
|
Access Casing OD |
33 mm |
Access Casing ID |
25 mm |
Access Casing Length |
1.5 or 3 m |
Access Casing Weight |
0.6 kg/m |
Bottom Cap OD |
33 mm |
Material |
PVC |
Access Casing Telescopic Section Specification |
|
Telescopic Section OD |
42 mm |
Telescopic Section ID |
35 mm |
Length |
500 mm |
Weight |
0.55 kg |
Material |
PVC |
Access Casing Magnetic Target Specifications |
|
Spider Magnets |
3 & 6 Leaf * |
Magnet Targets |
35 x 60 mm |
Plate Magnet Target |
33 x 300 mm |
Datum Target |
33 x 60 mm |
GXM-200 Series Specifications
GXM-200, 200P & 200T use inclinometer casing so that the combined system can monitor settlement, heave and also inclination with the use of a portable inclinometer.
Inclinometer Casing Specifications |
||
Casing OD |
70 mm |
83 mm |
Casing ID |
59 mm |
71 mm |
Casing Length |
1.5 or 3 m |
|
Casing Weight |
1.27 kg |
1.35 kg |
Material |
ABS |
|
Groove Spiral |
< 0.005 Rad / 3m |
|
Bottom Cap OD |
70 mm |
83 mm |
Inclinometer Casing Telescopic Section Spec. |
||
Section OD |
70 mm |
83 mm |
Compressed Length |
508 mm |
|
Extended Length |
660 mm |
|
Range |
152 mm |
|
Weight |
0.77 kg |
0.90 kg |
Material |
ABS |
|
Groove Spiral |
< 0.005 Rad / 3m |
Inclinometer Casing Magnetic Target Spec. |
||
Spider Magnets |
3 & 6 Leaf * |
|
Spider Target Chain |
300 mm |
400 mm |
Spider Target |
Release Pin |
|
Magnet Target |
100 x 70 mm |
110 x 85 mm |
Datum Target |
100 x 70 mm |
110 x 85 mm |
* 6 Leaf targets only size suitable for high settlement regions with many telescopic joints
GXM- 300 Series Specifications
The GXM-300 & 300i series surround either access casing or inclinometer casing with a flexible corrugated pipe that moves freely. It is intended for use in regions where high settlement is expected.
Corrugated Pipe Specifications |
|
Pipe OD |
42 mm |
Pipe ID |
35 mm |
Length |
3 m or 50 m Coil |
Magnetic Target/Coupler |
42 x 50 mm |
Material |
PE |
Bottom Cap |
43 mm |
Ordering Information
- Geo-XM Variety
- Depth of installation
- Target type
- Number of magnetic targets and datum magnets
- Reed switch probe range
- Installation tool range
Accessory Specifications |
|
Reed Switch Probe |
30, 50, 100, 150, 200 m |
Installation Tool |
30, 50, 100, 150, 200 m |
Mastic Tape |
10 m |