Wireless Mesh Monitoring System

Wireless Mesh Monitoring System 

Mesh radio geotechnical monitoring systems are a powerful tool for underground mines and structures.

They help engineers and managers:

  • Better manage their project by providing data they need from the right instruments
  • Improve safety by automatically collecting data from a large number of instruments
  • Lower costs by connecting instruments over very long distances with minimal disruptions

WHY USE ACKCIO?

Engineers and mine operators can obtain long-term, reliable, and comprehensive coverage of the tunnels, galleries, or areas they wish to monitor.  The cost of running instrument cables in large-scale instrumentation projects is often prohibitive and becomes a deterrent to the installation of robust and thorough monitoring systems. Other radio solutions require line of sight and do not offer the option for data to be relayed wirelessly. With a fully integrated mesh product data can be relayed around bends, twists, and turns and even be re-routed automatically should communications be impeded between two nodes. The system’s long-lasting battery life makes it an ideal solution for hard-to-access tunnels.

HOW DO THEY WORK?

Ackcio’s mesh system integrates a low-power and long-range radio with state-of-the-art geotechnical sensors. Instruments are directly wired to the node. The nodes perform acquisition and transfer data over radio to a gateway where all data is centralized.

Example applications

Barricades and backfilling
With dataloggers connected in a mesh network, it is safer and easier to monitor the level of backfill by doing it remotely in real-time.

Convergence monitoring
Tunnels need to be closely monitored for clearance for safety purposes. Using a combination of rock bolts, inclinometers and extensometers provides the information required for safe operations. With the Ackcio products, data can be relayed directly to the station or the offices for real-time monitoring and modeling, triggering alarms as needed.

Ground stability
Underground mines in the arctic use thermistor strings to monitor the temperature of permafrost in the vicinity of the mine. These instruments are often located out of the way and manually collecting their measurements requires precious time from field staff. By strategically locating relay nodes, data can be entirely collected remotely and used to track and model the mine behavior.

Specifications

Battery life
Up to 5 years. Varies depending on the sampling rate, the number of hops, and instrument types.

Data storage
Each node can store years’ worth of data.
The gateway has 16 Gb onboard memory.

Radio range
Up to 10 km (surface) or 1km (underground) per-hop with a line of sight. Up to 8 hops. Up to 50 nodes per gateway.

Temperature range
-40 °C to 80 °C

Compatible instruments

Vibrating wire instruments (1 and 8 channel options)
Analogue instruments (1 sensor with 2 outputs or 4 sensors with 2 outputs)

  • Thermistors
  • RTDs
  • Bridge Strain gages
  • Thermocouples
  • Potentiometers
  • ± 10 V
  • 0-20 mA

Digital instruments

  • Campbell Scientific
  • YieldPoint
  • SAA
  • Geokon
  • Geosense
  • Sisgeo

Vibrating wire Node      

Measurement range: 450 to 6000 Hz
Resolution (-40 to +85°C): 0.01 Hz
Accuracy (-40 to +85°C): 0.04 % FS 

Thermistor
Resolution: 0.1°C
Accuracy (20°C): 0.05°C

Barometer
Pressure Range: 300 to 1100 hPa
Resolution: 0.18Pa
Accuracy: 1.7 hPa

Tiltmeter Node
Type: MEMS (Micro-Electro-Mechanical System)
Inclinometer Range: ± 15°
Accuracy (± 15°): 0.01°
Axes: biaxial

Analogue node
Power supply:  5 V DC / 12 V DC / 24 V DC up to 60 mA selectable for each channel

Voltage
Measuring ranges [V DC]: ±10; ±1.25
Accuracy (-40 to +85°C): ± 0.05 % FS

Current loop (2-3 wires)
Measuring range: 0-20 mA
Accuracy (0 to +50°C): 0.05 % FS

Full wheatstone bridge
Accuracy (0 to -50°C): ± 0.25 % FS

Thermistor
Accuracy (-20 to -50°C): 0.2 °C

Document(s)

ACKCIO SOLUTION

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