What is the EAN-91M box-type analog tiltmeter used for?

The EAN-91M is used for monitoring small changes in inclination and vertical rotation of structures. Applications include monitoring vertical rotation of retaining walls, inclination of dams, piers, and piles, stability of structures in landslide areas, tunnel convergence, deflection in bridges and struts under different loading conditions, and monitoring structures around excavation or tunneling zones. The EAN-91M-B beam sensor variant is also used for monitoring differential vertical movement and settlement profiles along structures.

What is the difference between EAN-91M tiltmeter and EAN-91M-B beam sensor?

The EAN-91M is the standalone box-type tiltmeter that is mounted directly on a structural surface to monitor inclination changes at a single point. The EAN-91M-B is the beam sensor variant where the EAN-91M tiltmeter is mounted on an aluminium beam of 1 m, 2 m, or 3 m gauge length. The beam sensor is used to monitor relative differential vertical or horizontal displacement between the two anchor points at the beam ends, providing a profile of deformation across a structural span when installed in strings.

What is the difference between EAN-91M (analog) and EAN-93M (digital) tiltmeters?

Both EAN-91M and EAN-93M use the same MEMS technology with identical ±15° measuring range, ±10 arc second sensitivity, and ±0.1% FS accuracy in the same 125 mm x 80 mm x 57 mm weatherproof enclosure. The key difference is the output interface: the EAN-91M provides a 4V analog output proportional to Sin θ of the tilt angle, compatible with analog data acquisition systems such as EDAS-10 with EAM-616 multiplexer. The EAN-93M provides SDI-12 digital serial output, compatible with the ESDL-30 compact wireless datalogger and other SDI-12 data acquisition systems.

How is the EAN-91M tiltmeter mounted on a structure?

The EAN-91M can be mounted in two orientations. For monitoring rotation in the plane of a wall surface, the tiltmeter is mounted parallel to the wall using the wall-mounting swivel bracket fixed with 8 mm anchors or fasteners. For monitoring rotation in a plane perpendicular to the wall, the tiltmeter is mounted perpendicular to the wall using the optional mounting kit which allows easy adjustment of orientation. The wall-mounting bracket allows coarse levelling without requiring precise hole alignment.

What readout and data acquisition systems are compatible with the EAN-91M?

The EAN-91M analog tiltmeter is compatible with the EDI-53UTM portable digital readout unit for field measurements, the ESDL-30 compact wireless datalogger with GSM/GPRS or RF communication for remote automated monitoring, and the EDAS-10 data acquisition system using EAM-616 multiplexer (up to 16 tiltmeters per multiplexer) with a high-precision attenuator for the ±4V output. Data can also be uploaded to the Proqio cloud platform for real-time visualization and alerts.

What are the specifications of the EAN-91M analog tiltmeter?

The EAN-91M specifications are: Sensor – uniaxial MEMS (biaxial on request); Measuring range – ±15°; Output – 4V analog proportional to Sin θ at 15°; Sensitivity – ±10 arc seconds; Accuracy – ±0.1% FS; Temperature limit – -20°C to 80°C; Enclosure dimensions – 125 mm x 80 mm x 57 mm; Power supply – ±12V DC regulated; Wiring – 6-core cable with Red (+12V), Black (-12V), Green (0V), Blue (Channel A output), Brown (Channel B, biaxial only), White (Output Common).

What beam lengths are available for the EAN-91M-B beam sensor?

The EAN-91M-B beam sensor is available in standard gauge lengths of 1 m, 2 m, and 3 m. The gauge length is the center-to-center distance between the two anchor ends. Custom lengths can also be specified on request. Beams of different gauge lengths can be used together in a string installation, sharing common anchors between adjacent beams.

How does the EAN-91M tiltmeter measure structural tilt?

The EAN-91M tiltmeter is not used for absolute tilt determination. After installation on the structure, an initial tilt reading is recorded as the baseline reference. Subsequent readings are compared against this baseline to determine the change in tilt over time. The MEMS sensor inside the enclosure produces a bipolar DC voltage output proportional to the sine of the tilt angle. Counter-clockwise tilt produces a positive increase in output; clockwise tilt produces a negative decrease. The change in tilt over time indicates deformation or rotation of the monitored structural element.

What precautions should be taken when installing the EAN-91M tiltmeter?

The EAN-91M should be installed on a main structural member rather than a facade or boundary wall, which may behave differently from the main structure. Avoid locations subject to vibration from heavy rotary machinery. Protect the tiltmeter from direct sunlight – if unavoidable, cover with a thermocole or heat-insulating box. Do not install where it may be vandalized or hit by pedestrians. External factors such as temperature, seasonal weather changes, nearby construction activity, blasting, or earthquakes should always be observed and recorded alongside tilt data to aid correct interpretation.

Box-Type Analog Tilt Meter

Name: EAN-91M Box-Type Analog Tiltmeter & Beam Sensor | MEMS | Encardio-Rite
Brand: Encardio-Rite
SKU: Model EAN-91M
Availability: InStock

Model EAN-91M

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Download Manual Download Data Sheet - English

The EAN-91M tilt meter can be directly fixed on a wall/structure. The option is also available to fix the EAN-91M tilt meter to a beam of length 1 m, 2 m, and 3 m and use it as a beam sensor for monitoring of differential movement and rotation in structures. It is also used for monitoring deflection and deformation of retaining walls.

Sensor	Uniaxial; Biaxial
Measuring range	± 15°
Output (nominal)	4 V at 15° proportional to sine of angle (EAN-91M)
Sensitivity	± 10 arc seconds
Accuracy1	± 0.1 % fs
Temperature limit	-20° to 80°C
Dimension (mm)	125 x 80 x 57