Accelerometer SHM


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Description

The Move Accelerometer SHM can measure the acceleration of the point where it is installed, on the three axes, with high resolution. All of these Accelerometers SHM can be perfectly synchronised with each other. Thanks to this feature it is possible to measure the Vibration Frequencies and carry out a Modal Analysis of the structure. Like other devices, it is full wireless, and the battery lasts for years, in relation to the transmission frequency (timed and/or by threshold exceeding). The move SHM Accelerometer also integrates a temperature sensor inside.

This device is the next and updated version of the Triaxial Acceleration Monitoring sensor. It’s the SHM Accelerometer, an extremely precise three-axis wireless sensor, capable of synchronizing data samples with all the other Accelerometers SHM in the system. Wireless synchronized sampling is a very important feature that gives many benefits during structural monitoring. Thanks to this feature it is possible to carry out the Modal and Vibrational Analysis of any type of structure. Sample rates are variable and remotely configurable. The SHM Accelerometer also maintains the classic activation threshold operation. The battery-powered device has an operating autonomy of up to 8 years and it also has a temperature sensor.

The wireless SHM Accelerometers transmit accurate readings from the site via the LoRaWAN wireless communication protocol via a gateway. You can view and interact with your data online using the Move Cloud Platform.

Key parameters:

  • Triaxial wireless acceleration sensor
  • Wireless synchronized sampling operation, scheduled sampling operation, trigger operation
  • Relative synchronization 500 μs
  • Activation threshold operation
  • Integrated temperature sensor
  • Extremely simple installation with versatile mounting options
  • Ultra low noise performance
  • Resolution of 15bit (31.25μg, 62.5μg, 125μg), accuracy of ± 62.5 μg and range ± 0.512g, ± 1.024g, ± 2.048g
  • Built-in long-life battery
  • IP67 waterproof rating
  • Firmware is remotely upgradeable over the air via the gateway, reducing costly site visits.
OPERATION
Activation threshold mode: Acquisition of 1024 triaxial acceleration samples subsequent to exceeding the activation threshold set by the user. Acquisition of the temperature in correspondence of each event.
Planned acquisitions mode
(Modal Analysis):
Acquisition of 8192 triaxial acceleration samples with a fixed rate set by the user (every 1, 2, 6, 12, 24 hours), synchronized between all sensors. Acquisition of the temperature at each event.
Custom Operation Software: It is possible to request custom features that the client deems necessary for their business.
Sample Rate: 40Hz - 80Hz - 160Hz - 320Hz - 640Hz
All derived from a 4 kHz sampling by means of downsampling
Absolute synchronization: ± 5 seconds
Relative Synchronization (Modal Analysis): 500 μs

 

MEASUREMENT
Technology: MEMS technology - Triaxial
Acquisition of: Acceleration and Temperature
Resolution: 15bit (31.25μg, 62.5μg, 125μg)
Accuracy: ±62.5 μg
Range: ± 0.512g, ± 1.024g, ± 2.048g
Noise Density: 22.5 μg/√Hz


SAMPLE RATE BANDWIDTH (-3dB) THRESHOLD ACQUISITION DURATION PLANNED ACQUISITION DURATION
40Hz 13.5Hz 25.6s 204.8s
80Hz 27Hz 12.8s 102.4s
160Hz 54Hz 6.4s 51.2s
320Hz 108Hz 3.2s 25.6s
640Hz 216Hz 1.6s 12.8s


Radio
Radio channel: LoRaWAN communication protocol
Radio channel frequency: ISM 868Mhz
Link coverage: 1km (line of sight with the Gateway)*


GENERAL DATA
Waterproof Rating: IP67
Battery: 1 lithium battery type “D” 19Ah 3.6V
Operating temperatures: -40°C/+85°C
Dimensions: 75 x 80 x 57 mm
Weight: 1.1 Kg
Case material: Alloy GD-AlSi12
Corrosion resistance: >1000 hours in salt spray


INSTALLATION
Method: Two-point mounting using screws and plugs
(Ø6mm, L:30mm)
Site: Fixing on wall, on ceiling or ground


BATTERY AUTONOMY
Operating mode Estimated service life
Activation threshold 2 years*
Planned acquisitions 3 years*

 

* Wireless coverage of the device may vary depending on the scenario.

* Service life is calculated based on the typical scenario, maybe shortened when operating in extreme conditions.

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