MOTUS Wave Sensor

MOTUS Wave Sensor

A directional wave sensor module for use on surface buoys.
300 x 300

A directional wave sensor module for use on surface buoys. The MOTUS Wave Sensor is an integrated part of Tideland SB 138P MOTUS Buoy and YSI EMM 2.0 MOTUS Buoy. It is intended for commercial as well as research use. The sensor processes wave data and is configurable to present parameters and wave spectrum directly. The sensor can be connected to a SmartGuard using the CANbus based AiCaP protocol. It can also be connected to a PC or third party systems through the RS232 interface.

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  • Features
    • User configurable transfer function to compensate for buoy frequency response
    • Configurable compensation algorithm for installation outside of buoy center
    • Built-in solid state 9-axis accelerometer/gyro/ magnetometer
    • Options for external compass ensuring high directional accuracy even if the wave sensor is installed close to magnetic components
    • A compact field friendly low power multi-parameter wave sensor
    • Wide range of parameters are calculated inside the sensor, configurable output
    • Direct readout of engineering data
    • Integration time from 5 to 60 minutes
    • RS-232 output for integration to most third party Dataloggers
    • Configurable separation frequency between wind and swell waves
    • Extremely rugged and watertight. Handles 30 meter knockdown
    • Low power consumption, <110mW @12V

    Internal or External Compass

    The sensor is using an internal compass in order to reference directional data to geographical or magnetic north. If the magnetic field is disturbed by the buoy structure or payload an optional external compass may be used. This compass may either be connected via the AiCaP bus or using RS-232 input. At RS-232 input the sensor accepts heading given in NMEA 0183 format.

    Sensor communication protocols

    The AADI Real-time collector PC software can be used for communication with the sensor. It simplifies the sensor configuration process and saves sensor data to files on a PC. The AADI Real-Time communication protocol is a XMLbased protocol which also includes numerous metadata provides the Smart Sensor Terminal protocol a simpler protocol that can be used in most third party systems. The size of the output message can be reduced in both protocols by only enabling the necessary data parameters. Both protocols use ASCII output which makes it directly readable without any conversion (no binary data).

    Sensor as a part of a system

    The MOTUS sensor is designed to be a part of a Tideland Signal SB-138P buoy solution with easy expansion with a large number of additional sensors e.g. single point currents, current profiler, various water quality and meteorological sensors.

    Mooring consideration

    In order for the wave sensor to fully capture the required movements of the buoy a more flexible mooring is required. To obtain the required flexibility one section of the mooring should consist of a rubber cord. Guidelines for mooring design are available or the mooring may be ordered as a part of the buoy delivery.

  • Specifications
    Wave Height

    Range: 30m
    Resolution: <0.001m
    Accuracy: < ±0.05m or 1% of reading

    Wave Period Range: 1.42 - 33s
    Resolution: < 0.05s
    Accuracy: < 1%
    Wave Direction Range: 0 to 360°
    Resolution: < 0.5° 1)
    Accuracy: < 2° 1)
    Integration Time 5 -60 minutes
    Wave Calculation update rate 2 minutes
    Sampling Frequency IMU output rate: 100Hz
    Interfaces AiCaP, RS-232
    Power Supply voltage: 6-30Vdc
    Current drain: 110mW @ 12V
    Environmental Depth Rating: 30m
    Operating temperature: -5 to +40°C
    Dimensions: 130x130x110mm
    Weight including bracket: 1.23kg
    Materials: POM, Stainless steel 316, Brass
    Output Parameter

    Significant Wave Height
    Mean Wave Direction
    Peak Wave Direction
    First Order Spread
    Mean Spreading Angle
    Mean Wave Period
    Peak Wave Period
    Principal Wave Direction
    Long Crestedness Parameter
    Wave Spectrum
    Direction Wave Spectrum

    NOTE: Specifications are subject to change.