Triaxial Tilt Sensor Node

The FlatMesh Triaxial Tilt Sensor Node is an extremely high precision and exceptionally stable three axis tilt sensor which reports its measurements through Senceive’s FlatMesh wireless communications network to a FlatMesh Gateway.

It has been successfully applied in many applications, including those measuring:

  • Tunnel distortion
  • Tunnel heave / settlement
  • Embankment slippage
  • Structural movement
  • Rail track heave / settlement
  • Rail track bed cant and twist

Key benefits

  • Integrated triaxial tilt sensor
  • Extremely low noise performance
  • Resolution of 0.0001° (0.0018mm/m) and repeatability of ±0.0005° (±0.009mm/m)
  • Integrated long life battery
  • 12 -15 years battery life, including when acting as a relay node within the mesh communications network
  • 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

Physical specifications

Parameter Value
* Approximate values only
Dimensions excluding antenna 90 x 90 x 60 mm 90 x 96 x 60 mm (including vent)
Total Mass 0.6 kg*
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 -40°C to +85°C Sensor accuracy is reduced slightly at temperatures below -25°C

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 v1.8.1) 6.5dBm
Maximum Permitted Antenna Gain 2.2dBi
Range Up to 300m depending on the environment*

Tilt Sensor Specifications

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

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 12-15 years at 20-30 minute reporting intervals, including when acting as a relay node. *

Certifications

  • Tested to conformity with all the essential requirements of R&TTE Directive 1999/5/EC and RoHS Directive 2011/65/EU
  • Network Rail Acceptance PA05/04146
  • London Underground Approved Product ID 2073

Ordering Information and Accessories

Model Description
FM3N-IX FlatMesh 3 Triaxial Inclinometer
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
FF-BK-xxxx FF-BE Tilt beam kit See datasheet for more information
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