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Horizontal Geoflex

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It is ideal for data logging and real-time, remote monitoring for critical applications such as construction control.

A real-time alternative to the traversing probe type of inclinometer, the GeoFlex inclinometer system is a string of closely spaced MEMS sensors that employ a chain of sensors. Requiring no on-site operator, it is ideal for data logging and real-time, remote monitoring for critical applications such as construction control.

Typical applications include:

  • Landslide areas above dams, highways, and railroads to provide early warning of slope failure.
  • Ground movements induced by tunnel construction and excavation.
  • Monitoring embankment settlement in roadways, levees and retaining walls.
  • Monitoring under large diameter storage tanks
  • Deformation of deep foundation elements.

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Standard GeoFlex System – 70 mm Inclinometer Casing
DescriptionPart Number
GeoFlex Segment, 2.5 m57803900
GeoFlex Segment, 2.0 m57803920
GeoFlex Segment, 1.5 m57803915
GeoFlex Segment, 1.0 m57803910
GeoFlex Segment, 0.5 m57803905
Dummy Segment, 1.5 m57803993
Dummy Segment, 0.5 m57803990
Standard GeoFlex System – 85 mm Inclinometer Casing
DescriptionPart Number
GeoFlex Segment, 2.5 m57803960
GeoFlex Segment, 2.0 m57803980
GeoFlex Segment, 1.5 m57803975
GeoFlex Segment, 1.0 m57803970
GeoFlex Segment, 0.5 m57803965
Dummy Segment, 1.5 m57803995
Dummy Segment, 0.5 m57803992
Suspension Kit for 85 mm57801758
Bottom/terminal Plug57802210
Jumper Cable, 10 m57802211
Jumper Cable, 25 m57802225
Jumper Cable, 50 m57802250
Standard Geoflex System – 2.75 in Inclinometer Casing
DescriptionPart Number
GeoFlex Segment, 10 ft57803600
GeoFlex Segment, 8 ft57803608
GeoFlex Segment, 6 ft57803606
GeoFlex Segment, 4 ft57803604
GeoFlex Segment, 2 ft57803602
Dummy Segment, 5 ft57803535
Dummy Segment, 2 ft57803530
Standard GeoFlex System – 3.34 in Inclinometer Casing
DescriptionPart Number
GeoFlex Segment, 10 ft57803800
GeoFlex Segment, 8 ft57803808
GeoFlex Segment, 6 ft57803806
GeoFlex Segment, 4 ft57803804
GeoFlex Segment, 2 ft57803802
Dummy Segment, 5 ft57803835
Dummy Segment, 2 ft57803830
Suspension Kit for 3.34-in57801758
Pull Cable
DescriptionPart Number
Pull Cable50402310
Extra Carabiner02750012
Extra Saddle Clamp02700067
Data Loggers
DescriptionPart Number
CR6 Data Logger56700006
CR35056700350
CR1000Xe56700001
GTecLink GeoFlex Node57801700
GeoFlex Indicator57802990
GEOFLEX SYSTEM CONFIGURATIONS
CasingChoose 70 mm (2.75 in) or 85mm (3.34 in) diameter inclinometer casing or 38 mm (1.5 in) diameter Schedule 40 PVC pipe
GeoFlex SegmentsChoose a number of GeoFlex segments. When ordering, indicate the type of casing being used so that the proper centralizers will be installed on the system
Suspension KitOrder one suspension kit for each installation. The kit includes the suspension gate and hardware for securing the first segment.
Signal CableGeoFlex segments consist of interconnected nodes with a connector at the top and bottom of the segment. A bottom plug is required for the bottom of the system. A jumper cable connects the top of the system to the data logger
Data LoggerThe GeoFlex system works with many Campbell Scientific data loggers. The CR6 or CR1000Xe can log two GeoFlex systems per logger directly. The CR350 can log two GeoFlex strings.
Use the GTecLink data loggers for easy wireless data monitoring. The GeoFlex Node works with up to 50 GeoFlex nodes with an external power source or 10 GeoFlex nodes with internal power.
Data Reduction SoftwareReadings retrieved from the logger can be processed manually by spreadsheet or automatically by the Sensly web-based monitoring system

 

GEOFLEX NODE SPECIFICATIONS
Sensor TypeMEMS (Micro Electro-Mechanical Systems) tilt sensor for inclination readings in two axes.
RequirementsMinimum supply voltage of 10 Vdc. Maximum supply voltage of 30 Vdc. Digital RS485 signal requires Campbell Scientific data logger
Calibrated Range±30 degrees from horizontal over a temperature range of -10°C to +40°C.
Resolution9 arc seconds or 0.04 mm/m using the CR1000XE data logger.
Repeatability±82 arc seconds or ±0.4 mm/m
Required CasingFits 2.75-in or 3.34-in outer diameter inclinometer casing.
WaterproofWaterproof to 2 MPa (300 psi)
Weight0.54 kg per 0.6m (1.2 lb per 2 feet) gauge length
  • Real-Time Monitoring – The GeoFlex system is ideal for continuous, unattended monitoring and can deliver readings in near-real time.
  • Signal Cable Installation – Each sensor connects to the previous sensor above, requiring only one signal cable for each string and making data logger wiring easy.
  • Convenient Shipping and Transport – GeoFlex systems are made easy to ship. Five segments, each 1.64 feet long, easily fit in a carton measuring approximately 26 x 26 x 26 in and weighing less than 4.7 pounds. This makes the logistics of a GeoFlex installation easy. You can send the packages to a job site through overnight mail, carry a GeoFlex array in the trunk of your car, or even strap it to the cargo rack on an ATV and haul it to a remote job location. DGSI also offers placement rods to install at the end of the system, letting you save money by only monitoring the zone of interest.
  • Durable Components – Nodes, cables, connectors and gage rods are exceptionally durable, making it practical to remove the systems at the end of the project and redeploy them on other projects.
  • Data Reduction – The GeoFlex system outputs the displacement as engineering units, requiring less computing power and a lighter load on your data acquisition system. No need to keep track of what node has what calibration coefficients or what order you installed the segments in – the data logger detects and configures this automatically.
  • Complete Solution – DGSI offers complete monitoring solutions that include data loggers and web-based monitoring software that can check for alarm conditions in near-real time and can plot data immediately after retrieving the readings.

The system can contain up to 200 sensor nodes in a string installed in 85 mm or up to 50 nodes in a 70 mm inclinometer casing.
The casing provides access for subsurface measurements. The joints between sensors are robust, allowing the system to maintain a consistent orientation of all the nodes.
The GeoFlex is typically installed in a horizontal casing that passes through a suspected zone of movement. The nodes are spaced at 24” and provide a reading resolution similar to a traversing probe. The system spans the zone of movement and when the ground moves, the casing moves with it, changing the inclination of the nodes inside.
Cumulating the deflections along the string produces a graph of the casing profile. Changes indicate settlement or heave.
The GeoFlex system uses a data acquisition system to transmit readings to a data logger or cloud processing software that can trigger alarms based on displacements.

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