IOLITE® 3xMEMS
Low-Noise Triaxial MEMS Accelerometers and Inclinometers
NEMOSENSELow-noise vibration data logger and IoT device
NEMOSENSE is a tailor-made IoT device that combines a vibration data acquisition device, a data logger, and a low-noise triaxial MEMS accelerometer. It is an ideal vibration monitoring solution for permanent condition monitoring of wind turbines and structures such as bridges, buildings, antennas, and stadiums. It offers a great price-performance ratio.
Highlights
All-in-one data logger
NEMOSENSE is a data logger and data acquisition device with an embedded low-noise triaxial MEMS accelerometer. It performs the analog-to-digital conversion and offers an ethernet TCP/IP data interface.
Daisy chain
Multiple NEMOSENSE devices can be daisy-chained and synchronized via standard Ethernet network cable.
NTP and GPS synchronization
NEMOSENSE devices can be synchronized either with NTP sync (Network Time Protocol) with synchronization accuracy within 10 ms or GPS synchronization with accuracy of 1 µs.
Onboard processing
NEMOSENSE includes a small microprocessor. This allows setting up and calculating simple calculations like FFT's, RMS, P-P, and other statistical caluclations directly onboard.
Low noise density
The NEMOSENSE data loggers are embedded with a very low noise performance accelerometer available in two options: 25 µg/√Hz spectral noise or the S version with ultralow spectral noise density of 0,7 µg/√Hz. The S version is comparable to the best-in-class Force Balanced accelerometers.
Internal storage
NEMOSENSE devices have 32 GB of internal storage memory and can save up to 1 month of measured data at 125 S/s.
Great price/performance
The NEMOSENSE offers a good price vs. performance ratio and is thus perfect for system integrators, and large continuous monitoring installations.
Housing options
NEMOSENS enclosure is fully waterproof with a Harting push-pull RJ45 connector. It offers IP67 environmental protection. EXD (explosion protection) housing option is also available for the NEMOSENSE-3xMEMS-ACC (without battery and GPS). Ideal solution for vibration monitoring in Oil & Gas and Mining applications.
Battery power
NEMOSENSE can be optionally equipped with a battery for completely autonomous operation. The normal operational temperature range of the battery is -20°C to 60°C, but it is also available with an extended temperature range option for extreme weather conditions (-30°C to 70°C).
4G/LTE connectivity
NEMOSENSE devices can be optionally equipped with a 4G/LTE modem, allowing you to send and access your data via the cellular network.
Dewesoft quality and 7-year warranty
Enjoy our industry-leading 7-year warranty. Our data acquisition systems are made in Europe, utilizing only the highest build quality standards. We offer free and customer-focused technical support. Your investment into the Dewesoft solutions is protected for years ahead.
Solar power input
NEMOSENSE with solar power input and a solar panel kit is available (Only -B (battery) variant has this option).
Alignment functionality
NEMOSENSE comes equipped with a smart alignment feature that lets you virtually rotate and fine-tune the device’s orientation after installation. This allows perfect alignment effortlessly and in no time.
NEMOSENSE overview
NEMOSENSE is a low-power IoT device equipped with an integrated triaxial MEMS accelerometer. It collects data and stores it in CSV format. When a connection is available, data is transmitted to the server using the MQTT protocol.
The device features an onboard ADC converter for analog-to-digital conversion, eliminating noise picked up by analog cabling.
It has a selectable sampling rate: 25 S/s, 50 S/s, 100 S/s, 200 S/s, 500 S/s, 1000 S/s, and a selectable range (depending on the accelerometer option). The 8g option has ±2g, ±4g, and ±8g, while the 40g option has ±10g, ±20g, and ±40g ranges.
A built-in microprocessor handles simple processing tasks, such as FFT and basic statistics (Minimum, Maximum, Average, RMS), removing the need for an expensive external computer.
The NEMOSENSE device offers several triggered storing options on data and time (both can be selected at the same time). Acceleration, temperature, and inclination channels can be selected as a data storing trigger source. To even further improve the battery life time (if the battery version is used), several options of triggered sending are available. Check all the available options in the NEMOSENSE Technical Reference Manual.
Device options
The initial string after 'NEMOSENSE' specifies the platform's hardware options, while the remaining strings specify the measurement types.
Available platform options
If no platform option is specified, the device only has Ethernet connectivity
B - battery
standard battery module
WT specifies a Wide Temperature battery module
S - solar input
M - mobile connectivity (4G / LTE)
no additional option to -M specifies LTE module for EU/EMEA region
add -NA for the North America region
add -LA for Latin America region
G - GNSS synchronization
P - Standard IEEE 802.3af PoE power input on ENET 1 port, forward over spare pairs on ENET 2
Without the -P option, the device supports only passive PoE power mode on both ENET ports.
Available accelerometer modules
3xMEMS-ACC 8g - embedded triaxial MEMS accelerometer ±2g to ±8g measurement range
3xMEMS-ACC 40g - embedded triaxial MEMS accelerometer ±10g to ±40g measurement range
3xMEMS-ACC-S - ±15g measurement range, 0.7 µg/√Hz spectral noise density.
3xMEMS-ACC-8g-INC - The same specs as the 3xMEMS-ACC-8g with an integrated static inclinometer.
3xMEMS-ACC-40g-INC - The same specs as the 3xMEMS-ACC-40g with an integrated static inclinometer.
The options and measurement types can be combined.
The NEMOSENSE platform allows additional physical interfaces and measurement interfaces to be released in the future.
NEMOSENSE connectivity
All NEMOSENSE devices can connect to an existing Ethernet TCP/IP network or via mobile 4G/LTE networks (with the Mobile option) to send data to the Dewesoft Historian service, a time-series database for long-term data storage.
In addition to web clients, the data can be accessed and analyzed using the award-winning DewesoftX software, typically running on a client PC in an engineering office. The DewesoftX view client includes two modules:
Historian client: The MQTT client operates in DewesoftX’s measure mode, and displays live data from the measurement units.
Historian importer: The Historian Importer plugin operates in DewesoftX Analysis mode, allowing data from a chosen time frame to be loaded into a DewesoftX data file for in-depth analysis and reporting.
Additionally, CSV files can be retrieved from the device's internal storage via the NEMOSENSE configuration app.
Powering options
All NEMOSENSE devices can be powered in three ways:
Passive PoE (Power-Over-Ethernet) using our power injector or Active PoE by using an Ethernet switch with PoE
Built-in batteries with the battery pack option (NEMOSENSE-B)
A solar panel kit with dedicated power input is available (only the B (battery) variant has this option).
Internal battery power supply
The battery pack consists of four Lithium-Ion batteries with a nominal capacity of 46 Wh (standard) in 36 Wh (wide temp option) . The NEMOSENSE tested battery lifetime (standard option) is:
10 days of continuous logging-only
48 hours of LTE streaming at 31.25 Hz speed
5 days of continuous storing at 31.25Hz, triggered LTE sending - all data sent to the server once a day.
The internal battery can also be recharged over PoE.
NEMOSENSE, with a battery-powered option, is ideal for temporary vibration monitoring campaigns. It allows 10 days of continuous logging or 2 days of continuous streaming at 31.25 Hz without recharging.
The battery pack can also be used in conjunction with passive POE, serving as a UPS. If the power goes out, the device immediately switches to battery power to prevent data loss.
Synchronization options
The NEMOSENSE device supports the following data synchronization options:
NTP synchronization: When NTP time is available, the device continuously adjusts its clock to match the NTP time. The synchronization difference between NEMOSENSE devices on the same network with a local NTP server is typically within 10 ms, depending mainly on network latency. NTP synchronization is available on all NEMOSENSE devices.
GNSS synchronization: Available if the GNSS (G) option is ordered. Remote devices can be fully synchronized via GNSS clock with an accuracy of 1 µs.
LED status lights
The Dewesoft NEMOSENSE vibration data logger is equipped with intuitive status lights to provide clear indications of the device’s operational state and battery condition. These lights offer real-time feedback to ensure efficient monitoring and troubleshooting.
Device Status Lights
There are four LEDs on the front panel of the NEMOSENSE device between connectors ENET 1 and ENET 2.
YELLOW - run LED: when on, it indicates that the device is powered and running.
BLUE - network LED: the LED is showing network and MQTT/FTP connection
RED - sync LED
GREEN - measurement LED: when on, it indicates that the device is measuring and storing the data in the internal memory.
There are additional LEDs on the battery module of the NEMOSENSE-B:
WHITE - battery level LEDs
BLUE - charging status LED
YELLOW - ups arm LED
Device architecture
NEMOSENSE-3xMEMS-ACC is an Ethernet device and can be easily connected to an existing TCP/IP network. The MQTT Client is running onboard sending the data to the MQTT broker, a Dewesoft Historian component, installed on the server side.
Dewesoft Historian is a central point where data from NEMOSENSE devices, Dewesoft Measurement Units, and 3rd party MQTT clients is merged and stored into the same InfluxDB time-series database.
The data stored in the database can be accessed using a web browser (Grafana) or DewesoftX software.
Seismic noise performance
With only 25 µg/√Hz spectral noise density and 100 µg residual noise at 50 Hz bandwidth, the NEMOSENSE-3xMEMS-ACC device is a cost-effective solution for seismic measurements.
The FFT recorder on the image shows the residual noise of the three axes measured with an integrated accelerometer at the sample rate of 100 S/s resulting in a 96 dB dynamic range.
Product testing and validation
Hardware repairs or replacements are expensive on structures such as bridges. Therefore NEMOSENSE-3xMEMS-ACC was put through in-depth product validation tests that ensure reliable operation within its specifications.
Standard testing procedures include vibration and temperature cycle tests to check the durability and specify drifts in measured acceleration.
Historian database storing
NEMOSENSE dataloggers can be installed for long-term or permanent monitoring. This kind of measurement requires efficient data storage. For that, we provide Dewesoft Historian service. The Historian is a time-series database service based on the MQTT messaging protocol for the Internet of Things (IoT).
The 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.
The Historian is available to be installed on your own server (Windows, Linux, Mac OS) or as a completely managed cloud service.
Visit the Dewesoft Historian web page for more information.
Permanent outdoor mounting
NEMOSENSE-3xMEMS-ACC devices are supplied in a waterproof aluminum casing with RJ45 Harting push-pull connector. The enclosure is designed to be mounted outdoors and is fully waterproof and complies with IP67 environmental rating.
The outdoor enclosure automatically vents the air to equalize pressure inside the enclosure to the outside air pressure while it does not allow water to pass into the enclosure. This prolongs the life span of the seal and increases the durability of the enclosure.
Applications
NEMOSENSE-3xMEMS-ACC devices are designed for tailor-made structural health monitoring solutions and seismic monitoring solutions and are thus ideal for permanent health condition monitoring on big structures such as:
Wind turbines
Bridges
Buildings
Dams
Antennas
Stadiums
Structures in mines
Got Questions? We've Got Answers!
We've gathered all the answers you're looking for, neatly organized just for you.
NEMOSENSE is a family of ethernet (TCP/IP) based IoT data loggers developed by Dewesoft. Devices send data directly to the database using MQTT protocol and are designed for long-term or permanent monitoring. The first device, launched in 2023, is the NEMOSENSE-3xACC-MEMS, incorporating a 3-axial MEMS accelerometer.
The device was developed for long-term, unattended, structural health monitoring projects, where relatively slow vibrations are expected. The sampling rate is, therefore, limited to 1000 S/s and can be further increased up to 4k S/s on request in the future.
The device stores the data on a 32 GB internal memory (standard). The files on the internal memory are overwritten when the memory is full (with a standard 32 GB memory, this occurs after approximately two months of measurement at 125 S/s).
The data acquired by NEMOSENSE devices is sent to Dewesoft Historian. Dewesoft Historian is a server-based software package where data from NEMOSENSE devices and DewesoftX Measurement Units is merged and stored into the same InfluxDB time-series database. The data from the database can be imported into DewesoftX for in-depth analysis using DewesoftX Historian View Client.
Yes, the Nemosense supports a continuous streaming mode. When enabled, it continuously transmits data to the designated database.
NEMOSENSE always logs the data and starts sending it to the server whenever a connection is available. When the connection with the server is reestablished, the oldest data will be sent first and catch up with the present data.
NEMOSENSE supports three synchronization options:
- NTP synchronization: The devices are synced to a reference NTP server. Even when powered off there is a very precise RTC clock on the device that keeps track of the time. Therefore, when the device is powered up again, it will have a reasonably accurate absolute time. Sync delay between devices on the same network is within 10 ms. Other sync options (GPS) will follow in future versions.
- GNSS synchronization: The NEMOSENSE GNSS (G-version) supports GNSS synchronization and enables several remote devices to be synchronized to a GNSS clock with 100 µs accuracy.
- PTP synchronization: At the time of writing, this method is not yet supported in firmware but is supported in hardware; therefore, a future firmware upgrade will enable this functionality on all NEMOSENSE devices. PTP synchronization will enable all daisy-chained devices with a synchronization accuracy of 1 µs.
The device has a 25 µg/√Hz spectral noise density and 50 µg RMS noise at ±2g and 6Hz bandwidth. Lower-noise options (0,7µg/√Hz.) are possible on request.
Yes. All the "NEMOSENSE-B" versions offer a built-in Li-Ion battery. The battery pack consists of four 3,6V Lithium-Ion batteries with a nominal 12Ah. The battery packs can also be used in conjunction with passive POE. In this case, they serve as UPS. Immediately when out of power, the device switches to battery power to prevent data losses.
NEMOSENSE can be used in the LTE network to send data by adding an external LTE router. This is an example of a 3rd-party PoE LTE router. A fully integrated LTE NEMOSENSE device is planned in near future.
The battery pack consists of four 3.6 V Lithium-Ion batteries with a nominal capacity of 12Ah. The NEMOSENSE tested battery lifetime is:
- 10 days of continuous logging-only
- 48 hours of LTE streaming at 31.25 Hz speed
- 5 days of continuous storing at 31.25Hz, triggered LTE sending - all data sent to the server once a day.
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