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SLOPE INDICATOR - HORIZONTAL EL
IN-PLACE INCLINOMETER SENSORS |
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Application |
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The in-place inclinometer employs a fixed string of
sensors that can be monitored continuously by a data logger. Typical
applications for horizontal in-place inclinometers 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.
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Operation |
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The in-place Inclinometer system consists of inclinometer
casing and a string of electrolytic inclinometer sensors. The inclinometer
casing controls the orientation of the sensors. It is installed in a
horizontal borehole, buried in a trench, or attached to a structure, with
one set of grooves oriented vertically. The string of sensors is positioned
within the casing. |
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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.
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Advantages |
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High Resolution:
The ceramic EL sensor has a range of +/-
10 degrees and a resolution of 0.0024 degrees or 0.04 mm per meter when
read with a CR10X. Increased resolution is possible with a higher
resolution readout device.
Ideal for Critical
Applications:
In-place inclinometers are easily
connected to real-time data acquisition systems, on-site alarms, and
automatic dialers.
Lower Cost:
EL IPI systems cost significantly less
than comparable servo-accelerometer systems.
Wheels:
Wheeled sensors can be removed to allow
verification checks with a traversing probe or when sensors are needed an
a different site.
Rigid Gauge Tubing:
Inclinometer calculations require
straight-line segments for sensor gauge lengths. Rigid tubing satisfies
this requirement. Rigidg gauge tubing also provides reliable performance
across abrupt changes at the shear zone.
Single Cable Installation: The
multiplexed version of the EL IPI installs with just one cable. Although
multiplexed sensors are more expensive, their higher cost is partially
offset by easier installation and wiring, and savings on signal cable and
external multiplexers.
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| * Click to download
datasheet [Horizontal ELIPI Sensor][Manual] |
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