Introduction to Tiltmeters
EL tiltmeters are high resolution, narrow-angle tiltmeters ideally
suited for monitoring structures.
Advantages: Accurate, high-resolution measurements, can
be read remotely, easily automated, compact, reusable, reasonable
Limitations: Some applications require temperature corrections,
although careful placement of the tiltmeter can minimize this need.
EL beam sensors are similar to EL tiltmeters, except that the
tilt sensor is mounted on a rigid beam with a defined gauge length,
typically 1 to 2 meters long. Each end of the beam is anchored to
Advantages: The rigid beam makes it easy to convert changes
in tilt to millimeters of movement (settlement, heave, convergence,
or lateral displacement). Also, beam sensors can be linked end-to-end
to monitor differential movements and provide absolute displacement
and settlement profiles.
Limitations: Some applications require temperature
corrections, although careful placement of the tiltmeter can minimize
The MEMS tiltmeter is medium-resolution tiltmeter that offers a
wider measurement range of +/- 10 degrees.
Advantages: Waterproof, available in uniaxial or biaxial
versions, can be read remotely, easily automated, compact
and easy to install, reusable. Available in a deepwater model with a brass housing.
Limitations: Less sensitive than the EL tiltmeter.
The portable tiltmeter is carried from tilt plate to tilt plate
to obtain measurements.
Advantages: A single tiltmeter can be used to monitor any
number of inexpensive tilt plates. The tiltmeter uses the same reliable
servo-accelometer sensor that is used in the Digitilt inclinometer
Limitations: No remote reading, cannot be automated, accuracy
affected by placement of tiltmeter on tiltplate.
Track monitoring sensors monitor settlement and twist in railway
tracks. This is a specialized application for tilt sensors. Two
versions are available: one based on the narrow-angle beam sensors
and the other based on wider angle EL or MEMS sensors.
Advantages: Mounts directly on ties. Can survive reballasting
operations. Can be read remotely, easily automated.
Limitations: Cannot provide readings during passage of train.