Optical Displacement Sensor Node

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*COMPATIBLE WITH BOTH FLATMESH™ AND GEOWAN™ SYSTEMS*

The Optical Displacement Sensor Node is an instrument which uses optical means to take high precision displacement measurements and pass these through Senceive’s wireless communications network to a Gateway.

It can also be combined with Senceive’s world-leading triaxial tilt sensor to obtain high precision tilt measurements that are linked to an external reference.

Optical Displacement sensing is perfect for many applications, including those measuring:

  • Convergence/divergence for Tunnel/Arch intrados or bridge abutments
  • Vertical movements for structural settlement/heave
  • Lateral movements such as rail track slew
  • Earthworks and embankment movement

Key benefits

  • Fully integrated unit
  • Extremely low noise performance
  • Optical sensor resolution of 0.1mm and repeatability of ± 0.15mm
  • Triaxial tilt sensor resolution of 0.0001° (0.0018mm/m) and repeatability of ±0.0005° (±0.009mm/m)
  • Integrated long life battery
  • 10 years battery life, including when acting as a relay node within the mesh communications network
  • Easy to align with target when using the magnet triggered aiming mode
  • Integrated temperature sensor
  • Versatile mounting options
  • Waterproof to IP66 / IP67 / IP68
  • Firmware is remotely upgradeable over the air via the gateway reducing costly site visits

Please note: specifications on this web page are preliminary.

Physical specifications

Parameter Value
Dimensions excluding antenna 90 x 90 x 60 mm
90 x 96 x 60 mm (including vent)
Total Mass 0.6 kg (approx.)
Housing Material Die cast aluminium
Protection

(BS EN 60529: 1992 + A2: 2013)

IP66 / IP67
IP68 at 1m for 24 hours
Mounting Options Clearance holes for M4 socket head screw in bottom, M4 blind holes in side
Plates and brackets available for magnetic fixing, track bed, stake and pole mounting, and many other applications
Operating Temperature Range -10°C to +50°C (full functionality)
-25°C to +70°C (mesh radio, temperature and tilt)

FlatMesh Radio Specifications

Parameter Value
* Consult with Senceive for your application
Communication Type Proprietary FlatMesh v3 Mesh Networking
Protocols
IEEE 802.15.4 compliant
Frequency Band 2400 – 2485 MHz ISM Band
Maximum Transmit Power (EN 300 328 v2.1.1) 6.5dBm
Maximum Permitted Antenna Gain 2.2dBi
Range Up to 300m depending on the environment *
RF Module Senceive FM3Node

GeoWAN Radio Specifications

Parameter Value
* Consult with Senceive for your application
Communication Type Star Topology
Frequency Band 863MHz – 928MHz ISM Band
Maximum Transmit Power 20dBm (actual transmit power depends on geography)
Range Up to 15km depending on the environment and antenna*
Maximum Reporting Frequency 30 Seconds
Sample Storage Stores the latest 36 days of samples at a reporting interval of 30 minutes

Optical Sensor Specifications

Parameter Value
Resolution 0.1mm
Repeatability ±0.15mm
Range 50 metres (natural surface)
100 metres (white target)
150 metres (reflecting target)
Laser Type Class 2, 655nm (visible red)

Tilt Sensor Specifications (-IX version)

Parameter Value
Resolution 0.0001° (0.00175mm/m)
Repeatability ±0.0005° (±0.0087mm/m)
Range ±90°

Internal battery

Parameter Value
* Consult with Senceive for your application
Battery Type Lithium Thionyl Chloride
Nominal Voltage 3.6V
Nominal Capacity 19000mAh
Typical Battery Life 10 years at 1 hour reporting interval, including when acting as a relay node
8 years at 30 minute reporting interval, including when acting as a relay node
Battery life may be reduced when measuring to poorly reflecting surfaces *

Certifications

  • Tested to conformity with all the essential requirements of RED Directive 2014/53/EU and RoHS Directive 2011/65/EU

Ordering Information and Accessories

Parameter Value
FM3N-ODS
LR3N-ODS
FlatMesh 3 Optical Displacement Sensor
GeoWAN Optical Displacement Sensor
FM3N-LDS-IX FlatMesh 3 Optical Displacement Sensor with integrated Triaxial Tilt Sensor
FF-MP-S360 Swivel mounting kit with 360-degree adjustment range
screw directly to vertical walls
FF-MP-V Vertical mounting plate

  • use U-bolts to fix to poles or stakes
  • use glue to fix to walls where drilling is not permitted
  • Use with FF-MP-S360
FF-MP-RA Right angle mounting bracket

  • screw to concrete tunnel linings and inclined walls

Use with FF-MP-S360

FF-MP-T2 Track bed mounting plate kit
FF-MP-M2 Magnetic mounting kit
High degree of adjustability, perfect for cast iron lined tunnels
FA-FM-WPS Waterproof straight antenna
Overall node height 168mm (approx) when fitted
Maximum gain +1.1dBi
FA-FM-LPS Waterproof low profile straight antenna
Minimum overall node height, perfect for track bed and tight spots
Overall node height 92mm (approx) when fitted
Maximum gain 0dBi
FA-FM-ADJ Adjustable angle antenna
Flexible installation, perfect for use in tunnels and indoor environments
Overall node height 202mm (approx) when fitted and upright
Overall node height 102mm (approx) when fitted and at 90-degree angle
Maximum gain +2dBi
FC-NC Antenna cover kit
Use with FA-FM-LPS antenna
Overall node height 96mm (approx) when fitted