EL Tiltmeters
Applications
EL tiltmeters are used to monitor changes in the inclination of a structure. They provide an accurate history of movement and early warning of potential structural damage. Applications for tiltmeters include:
- Monitoring the rotation of retaining walls, piers, and piles.
- Monitoring the behavior of structures under load.
- Documenting effects of nearby excavations and providing early warning of potential damage.
Operation
The EL tiltmeter consists of an electrolytic tilt sensor housed in a compact, waterproof enclosure. The tilt sensor is a precision bubble-level that is sensed electrically as a resistance bridge. The bridge circuit outputs a voltage proportional to the tilt of the sensor.
When the tiltmeter is read manually, changes in inclination are found by comparing the current reading to the initial reading. EL tiltmeters may also be connected to a data logger, which can obtain frequent readings, perform calculations, and trigger alarms if tilt or the rate of change exceeds preset limits.
Narrow-Angle and Wide-Angle Models
The narrow-angle EL tiltmeter (shown with cover removed) measures tilt over a range of +/- 40 arc minutes. It can detect changes as small as one arc second (0.00028 degree). It is supplied with a two-point mounting bracket for use with groutable anchors.
The wide-angle "MonoPod" EL tiltmeter (shown at right) measures tilt over a range of +/- 10 degrees. It can detect changes as small as 0.0024 degree. The wide-angle tiltmeter is called the "monopod" tiltmeter because it is supplied with a unique, single-point mount for easy installation anywhere.
For more information
For further information, please refer to the related document (pdf). These documents can be viewed and printed with Adobe Acrobat Reader.