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Horizontal In-Place Inclinometer Sensors


mems ipi sensors
Datasheet Manual

A real-time alternative to the traversing probe type of inclinometer, the in-place inclinometer employs a fixed chain of sensors and does not require an on-site operator. It is ideal for data logging and real-time, remote monitoring for critical applications such as construction control. Typical applications include:

  • Monitoring of ground movements induced by tunnel construction and excavation.
  • Monitoring of stabilization measures such as grouting and underpinning.
  • Monitoring settlement under tanks, landfills, embankments, and dams.


horizontal in-place inclinometer

The in-place inclinometer system consists of inclinometer casing and a chain of inclinometer sensors. The inclinometer casing, which controls the orientation of the sensors, is installed in a trench or horizontal borehole with one set of grooves oriented vertically. The sensors are then positioned within the casing.

The sensors measure the inclination of the casing (tilt from horizontal). Changes in the inclination readings indicate that the casing has been displaced by ground movement. The amount of displacement is calculated by finding the difference between the current inclination reading and the initial reading and then converting the result to a vertical distance.

In most in-place inclinometer applications, sensors are connected to a data acquisition system that continuously monitors movements and can trigger an alarm when it detects a change, or rate of change, that exceeds a preset value.


Ideal for Critical Applications: In-place inclinometers are ideal for continuous, unattended monitoring and can delivery readings in near-real time.

Single Cable Installation: The serial-sensor version of the MEMS IPI is supplied with cable and connectors, so that each sensor can be connected to the sensors above and below, effectively reducing the number of signal cables to one. This eases installation and simplifies connections to the data logger. Although serial sensors are more expensive, their higher cost is offset by savings on signal cable and external multiplexers.

Durable and Reusable: Strong wheels make it practical to install and remove these sensors at regular intervals. (It is good practice to periodically verify readings with a traversing probe). Later, when the project is finished, the sensors can be recovered and reinstalled at another project site.

Configurable Gauge Lengths: The use of varied gauges lengths can provide better measurments while reducing the total number of sensors needed for complete coverage. Use short gauge lengths to obtain detailed measurements within the zone of interest; use long gauge lengths to monitor adjacent zones.

High Performance: The MEMS sensor has a range of +/- 10 degrees and a resolution of 9 arc seconds (0.04 mm/m) with a CR1000.

Complete Solution: Slope Indicator offers complete monitoring solutions that include data loggers and software such as Atlas Web-Based Monitoring Software , which can present profile plots and trend plots of inclinometer data just minutes after the readings are obtained.

For more information

Please download the datasheet and manual for Horizontal In-Place Inclinometer Sensors. These documents can be viewed and printed with Adobe Acrobat Reader.