In-Place Inclinometers (IPIs)
- Inclinometer chain provides a complete displacement profile across a line
- Biaxial and uniaxial sensors for vertical or horizontal applications
- Compatible to standard inclinometer casing
- Monitoring can easily be automated
- Minimized cabling effort due to RS485 bus
Principle of Operation
For vertical installation the probes are usually equipped with two perpendicular tilt sensors. By this way lateral thrust can be observed in two directions.
Construction and Data Acquisition
An In-Place inclinometer system, acronym IPI, comprises a series of stationary elements with either one or two build-in tilt sensors in each element, for continuous measurements of inclination at specific locations on a measuring line.
The core of each probe is a high accuracy MEMS accelerometer providing the tilt with respect to gravity. The sensor signals are digitized by a 20 bit AD-converter, corrected and temperature compensated by a microcontroller and transferred to a central recording unit via a bus-capable RS485 interface.
This technique allows the installation of > 15 sensors within a low diameter inclinometer casing. The low power design and data transmission technique meets the Electric Compatibility Standard EN50121 1-4.
Special attention was turned to proper design of long term water tightness under pressures of > 8 bar.
Big diameter gauge tubes guarantee accurate measurements even for 3m probe length and horizontal installation.
The RS485 interface incorporates a simple ASCII protocol with sensor address, channel indicator, the tilt value in µm/m, temperature as well as a checksum.