Tailor-made data acquisition devices for structural health monitoring applications. Ideal price-performance solution for permanent condition monitoring on structures such as bridges, buildings, antennas, and stadiums.
IOLITE 3xMEMS-ACC overview
IOLITE 3xMEMS-ACC are integrated sensing devices for measuring vibration, inclination, velocity, displacement, pitch, and roll. Acceleration is measured by an integrated triaxial MEMS accelerometer inside the device. The accelerometer is tightly attached to the mechanical chassis.
A microprocessor inside the device transmits the acceleration samples over into DewesoftX data software running on a Windows PC. Alternatively, the devices can also be connected to any controller running an EtherCAT master. Sensor scaling is automatic, The data in g's or m/s2 is readily available to the user.
Available device configurations
IOLITE 3xMEMS devices are available in several configurations:
IOLITEi-3xMEMS-ACC-8g: ±2g to ±8g measurement range, 0 - 1000 Hz bandwidth, 4 kS/s sampling rate, 96 dB dynamic range, and 25 µg/√Hz spectral noise density.
IOLITEi-3xMEMS-ACC-40g: ±10g to ±40g measurement range, 0 - 1000 Hz bandwidth, 4 kS/s sampling rate, 96 dB dynamic range, and 25 µg/√Hz spectral noise density.
IOLITEi-3xMEMS-ACC-S: ±15g measurement range, 0 .. 460 Hz bandwidth, 1 kS/s sampling rate, 137 dB dynamic range, and 0.7 µg/√Hz spectral noise density.
IOLITEi-3xMEMS-ACC-8g-INC: The same specs as above with integrated inclinometer.
IOLITE-2xMEMS-INC: A static two-axial inclinometer measurement device. Measurement range: +-15 deg, resolution: 0,001 deg, relative accuracy: 0,01 deg.
IOLITEi-3xMEMS-ACC-T: Same specs as the IOLITEi-3xMEMS-ACC-8g with the additional connector at the front to which a temperature sensor can be connected.
Distributed EtherCAT® architecture
EtherCAT® protocol allows the IOLITE devices to be easily distributed across large structures. Devices can span 50m node-to-node with only one cable running between them for signal, power, and synchronization.
Static inclinometer to measure pitch and roll angles
We offer two versions of IOLITE 3xMEMS devices that can be used as a static two-axial inclinometer. Devices can be used to measure the pitch and roll angles (around its X and Y axes with the Z-axis positioned vertically).
IOLITEi-3xMEMS-ACC-8g-INC: The same specs as IOLITE-3xMEMS-ACC-8g with an integrated inclinometer.
IOLITE-2xMEMS-INC: A static two-axial inclinometer measurement device. Measurement range: +-15 deg, resolution: 0,001 deg, relative accuracy: 0,01 deg.
A static two-axial inclinometer offers the following specs:
Measurement range: +-15 deg
Resolution: 0,001 deg
Relative accuracy: 0,01 deg
IOLITEi-3xMEMS-ACC-T to measure acceleration and temperature on structures
The IOLITEi-3xMEMS-ACC-T version features an additional M8 connector at the front to which a temperature sensor can be connected. This allows a simple and inexpensive addition of a temperature measurement point in monitoring applications on bridges, wind turbines, and other structures. Both IOLITEi (IP20) and IOLITEiw (IP67) variants are available with this option.
Only a dedicated temperature sensor is compatible and must be ordered separately. It is a digitized temperature sensor with the following specs:
Measurement accuracy: +-0.5 °C
Measurement range: -55 to 125 °C
Envoronmental proteciton: IP66.
1-wire protocol is used for communication between the sensor and the 3xMEMS-ACC device. Maximum cable length is 10 m.
Seismic noise performance
IOLITEi 3xMEMS devices have a very low spectral noise density. The IOLITEi 3xMEMS-ACC-S has a 0,7 µg/√Hz spectral noise density and residual noise of 2µg (RMS) at 100 Hz bandwidth. Its performance can be easily compared to the best-in-class Force Balance accelerometers.
Ready to measure displacement
Even though the IOLITEi 3xMEMS-ACC devices measure acceleration, can be also used to precisely measure displacement by integrating the acceleration twice and applying appropriate filtering. The task is straightforward thanks to the DewesoftX data acquisition software.
Product testing and validation
Hardware repairs or replacements are expensive on structures such as bridges. Therefore IOLITE 3xMEMS-ACC was put through in-depth product validation tests that ensure reliable operation within its specifications.
Permanent outdoor mounting with the IP67 waterproof casing
IOLITE 3xMEMS-ACC devices are available in a waterproof aluminum casing with cable glands. The enclosure is designed to be mounted outdoors and is fully waterproof. It complies with IP67 environmental rating. Devices can operate in a wide temperature span from -20°C to 65°C.
Historian database storage
IOLITE data acquisition device can be installed for long-term or permanent monitoring. This kind of measurement requires efficient data storage. For that, we provide Dewesoft Historian service. Historian is a time-series database service based on the MQTT messaging protocol for the Internet of Things (IoT).
Historian is based on an open-source InfluxDB database and is a perfect solution for long-term monitoring. Data in the Historian can be accessed in two ways:
Web clients: any modern web browser can be used as a web client to access real-time data stored in the Historian. The solution is based on another open-source project Grafana. It allows to set up of completely customized views and is a perfect solution for real-time dashboards.
Desktop client: the desktop client is an instance of our award-winning DewesoftX software. It allows you to import historical data from the Historian database for in-depth analysis.
Installation accessories
Devices are daisy-chained with a standard ethernet network cable. It is recommended that the cable is shielded (SFTP, CAT5e) and has a minimum of 24 AWG wire thickness. The cable must have 4 wire pairs. The maximum distance node-to-node is 50 m.
Industrial application and system integrations
Systems based on IOLITE® 3xMEMS data acquisition hardware and DewesoftX software are installed all over the globe to perform important structural monitoring. One of our bigger system integrators, ESSEBI, is integrating IOLITE® 3xMEMS accelerometers in permanent structural monitoring systems.
