Encardio-rite Model EAN-41M tiltmeter is a tilt beam sensor is designed for monitoring inclination and vertical rotation of structures. Any change in a structure that is caused due to construction activity like excavation; tunnelling or de-watering that may affect the ground supporting the structure is called a tilt change. It may also be due to the loading of the structure, such as loading of a dam during impoundment, loading of a diaphragm wall during excavation or loading of a bridge deck due to wind and traffic. The Data collected from the tiltmeter provide an early warning of possible threatening deformations, giving sufficient time to take corrective measure or evacuation of the area, if necessary.
Applications of Tilt Beam Sensor
EAN-41M tilt beam sensor finds its application in the following monitoring activities:
Monitoring the vertical rotation of retaining walls.
Monitoring inclination and rotation of dams, piers, piles and other structures.
Monitoring stability of structures in landslide areas.
Monitoring tunnels for convergence and other movements.
Monitoring safety of structures around zones of excavation or tunnelling.
Monitoring deflection in bridges and struts under different loading conditions
Operating Principle
Built around the Micro-electromechanical system (MEMS), Encardio-rite Model EAN-41M tilt beam sensor has a range of ±15°, along with high sensitivity and accuracy mounted inside an aluminium enclosure (beam). It provides a bipolar DC voltage output proportional to the sine of tilt angle measured by the tiltmeter. The output is zero volts for a truly vertical position.
The beam sensor gives a comparatively low-cost tilt measurement solution and yet offers excellent resolution and long term stability. With the help of mounting accessories like brackets and anchors, the tiltmeter can be secured on any vertical surface, horizontal floor, or the ceiling.
Also Read: Inclinometer: Types, How It Works, & Uses
Model EAN-41M Tilt Beam Sensor is not designed to measure the absolute determination of tilt of structures. It measures the change in the tilt of a structure to which it is fixed. Once the instrument is mounted on the structure, the initial tilt reading is noted. Subtracting initial tilt reading from subsequent tilt reading gives the change in the tilt of structure over a period of time.
Installation of Tiltmeter
Encardio-rite Model EAN-41M can be installed in horizontal as well as the vertical surface. Let’s start with the installation on horizontal structures. Tools and accessories required for installation
Sensor mounting kits, one more than the number of beams to be mounted in series.
Two open-ended spanners of 17 mm size and one open-ended spanner of 13 mm size, or two adjustable wrenches.
One flat head screwdriver with 4 mm blade width.
Quick set epoxy grout for grouting the anchors in concrete.
Loctite 290 threads sealant or any other equivalent post assembly thread sealant.
Percussion or hammer drill with 12 mm drill bit.
Chalk line and coloured chalk.
Tape measure, longer than the maximum beam gauge length to be used.
Spirit level.
Installation of Horizontal Beam Sensor
Installing the anchors
Horizontal beam sensors are designed to discover the relative vertical displacement of the two anchors at its ends. The distance between the two anchors is known as the gauge length of the beam sensor. They are usually available in standard gauge length of 1, 2 or 3 m, but varied specified lengths are also ...[Continue Reading]
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