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VIBROsense - Model 3ax -Triaxial Accelerometer
The VIBROsense 3ax triaxial accelerometer is a dynamic sensor capable of measuring the acceleration of the point in which it is installed, essential for measuring vibration frequencies and for carrying out the modal analysis of structures. By carrying out periodic measurements spaced out over time, it is possible to identify structural variations and anomalies, linked to local damage, variations in the geometry or in the behavior of the materials and therefore, ultimately, it is possible to determine the current state of structures (Structural Health Monitoring).
The VIBROsense 3ax accelerometer produced by Novatest is a sensor based on capacitive MEMS technology with digital output which can be connected to the data logger in two ways: via the RS485 serial line, with open communication protocol, or wireless via Lo.Ra protocol.
It contains a high resolution accelerometric sensor and a backup accelerometric sensor. The presence of a double accelerometer on board allows the operator to immediately understand if an anomalous reading of a sensor is caused by a malfunction of the measurement accelerometer or by an actual structural anomaly, being able to compare the readings of the two sensors in real time and thus avoiding the multiplication of useless inspections.
Furthermore, the sensor is equipped with an integrated GPS module which, through communication with various satellite constellations, guarantees the synchrony of the acquisitions, an indispensable aspect for the modal analysis.
The signal acquired by the sensor is digital and the 24-bit conversion is carried out directly in the electronic circuit on board, thus canceling the inevitable signal losses due to the noise introduced by the transit of the same along the wiring.
- Dynamic structural monitoring of bridges and viaducts
- Dynamic structural monitoring of buildings of historical and artistic value
- Dynamic structural monitoring of telecommunication towers and wind turbines
- Double accelerometric sensor to facilitate the identification processes of instrumental anomalies
- Digital accelerometric data to minimize noise
- 24-bit resolution
- IP67 degree of protection
- Robust construction and also suitable for complex environments
- Vertical and/or horizontal installation
- Ease of assembly
- Technology: triaxial digital MEMS
- Acquired variables: Acceleration (x, y and z) and temperature
- Measurement range: +/-2g, +/-4g, +/-8g
- Resolution: 24 bits (3.9μg, 7.8μg, 15.6μg)
- Accuracy: +/- 9 mg
- Sensitivity: 2000 mV/g (for FS +/-2g)
- Non-linearity: < 0.1% (for FS +/-2g)
- Noise density: < 25 μg/√Hz
- Phase angle variation: < 15° in 0–50 Hz
- Sampling frequency: 0–500Hz
- Temperature stability: +/- 0.01%/°C
- Output signal: digital in RS485
- Connection: wired (via RS485 bus) or wireless (with Lo.Ra. protocol)
- Radio channel frequency: 868 Mhz
- Connection coverage: 1-3 km
- Power supply: via cable (RS485 version) and with internal battery (wireless version)
- Operating temperature: -40…+85 °C
- Case dimensions: 75 x 80 x 57 mm
- Level of protection: IP67
- Housing material: Aluminum alloy
- Fixing method: At three points (with screws and dowels) on the wall, ceiling or ground
- Trigger Threshold Mode: Acquisition of n samples of triaxial acceleration following the exceeding of the trigger threshold set by the user
- Scheduled acquisition mode (for Modal Analysis): Acquisition of acceleration samples with a fixed frequency and triaxial synchronous acquisition started via datalogger (analysis duration equal to 60 minutes)
- Sampling frequency: 500Hz
- Absolute synchronization: Based on GPS signal (+\- 1 sec)
- Relative synchronization: max 100 ns