In-Place Inclinometer (IPI) Overview

The In Place Inclinometer (IPI) is designed for near vertical borehole applications, the principal operation and data obtained are similar to the traversing type inclinometer systems such as the portable Digital Bluetooth Inclinometer systems.

The In-Place Inclinometer (IPI) is used to measure lateral displacement within a borehole.

Most commonly, the IPI is used in a system where multiple IPIs are installed at varying depths. In this manner the profile of the displacement can be monitored.

The IPI itself consists of one or two (uniaxial or biaxial) MEMS tilt sensors mounted in a stainless steel housing. Each sensor incorporates an on-board microprocessor which performs an automatic temperature compensation of the tilt (g) data.

The sensor itself is a small discrete device which measures in g (gravity). The sensors are powered and read by a data logger such as the Campbell Scientific CR1000. Argus software can produce a near real time profile of displacement that is constantly updated.
In Place Inclinometer Data Sheet
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Product Features
  • Sensor strings give a readily automated profile of vertical or horizontal displacements
  • Accurate and precise measurements using MEMS sensors
  • Available in Uniaxial and Biaxial versions
  • Inbuilt temperature compensation
  • Stainless steel construction, waterproof to 2000kPa

Product Benefits
  • Easy to automate using data acquisition systems and Argus software
  • Removes the need for manual monitoring
  • Recoverable and reusable
  • Suitable for safety critical applications
  • Low power consumption

Operation
IPIs are installed in inclinometer casing within a borehole; a sprung wheel assembly on the IPI engages into the keyways of the inclinometer casing to ensure alignment.

Multiple IPIs are installed at varying depths, secured using gauge rods connected to the next/previous IPI; the final gauge rod is secured at the top of the borehole using a top support assembly.

Each IPI is connected to a data logger such as a Campbell Scientific CR1000; the datalogger powers the sensors, initiates readings and communicates the data.

Argus monitoring software can also be used to display and monitor the data.

Application
IPI systems measure lateral movement in the ground or in a structure. They are useful for determining the depth, direction, magnitude, and also rate of movement.

For example, they can be used to ascertain the stability of retaining walls by measuring bending and rotation in the retaining wall. They can also reveal ground movement that could affect other buildings. Inclinometer systems can also be used to detect movement in the downstream and upstream side of dams and to define shear zones in the foundations of concrete faced dams.

The measurements of recorded movement can be utilised to check that the deflections are within the design assumptions. Monitoring should be continued to establish any longterm effects after works have finished.

Inclinometer casings can be used in boreholes, embedded in fill material, cast into concrete or attached to structures for the following typical applications:
  • Detecting slopes and landslides
  • Determining shear and slip zones
  • Monitoring diaphragm or sheet pile walls
  • Monitoring bending in piles
  • Verifying design assumptions and finite element analysis
  • Long term monitoring purposes
  • Monitoring dams
  • Detecting and recording ground movement due to tunnelling operations
  • Monitoring retaining walls
  • Use horizontal IPI systems to measure settlement and deformation of concrete slabs and tank bases

Technical Rating
As the correct installation of any monitoring sensor or system is vital to maximise performance and accuracy, Geomotion makes the following recommendations for the skill level of the installation contractor.

Technical Rating for this Product:  ADVANCED

The installer is trained and experienced in the installation of this type of instrument or systems, and is ideally a specialist Instrumentation and Monitoring contractor.

Geomotion offer installation and monitoring services to support this system. For more information please please contact us.