3 INSTALLATION
The SMC motion sensor must be installed according to the instructions in this manual.
The motion sensor is designed to be installed in an internal environment.
3.1 LOCATION
The optimal location for the SMC motion sensor is as close as possible to the vessels center of gravity
(CG). However, for certain applications, mainly when heave and accelerations are to be measured at
a specific location, it is advisable to mount the motion sensor as close as possible to the actual
measurement point, for example in Helideck Monitoring Systems and some hydrographic survey
systems.
Recommendations for location of the motion sensor to obtain optimal performance:
Roll & Pitch
When mounting the SMC motion sensor, take care to align the motion sensor to the vessels roll,
pitch and Z axis. If there is a rotation misalignment in the Z-axis, roll motions will induce errors in
pitch measurements and vice versa.
Small alignment errors can be adjusted mathematically inside the motion sensor. The alignment
offsets can be set from the SMC IMU configuration software.
Heave/acceleration
If the motion sensor is equipped with Heave/acceleration measurement it is recommended that the
motion sensor is placed as close to the point where Heave/acceleration is to be measured. For a
helideck installation, it is required to install the motion sensor within 4 meters from the center of the
helideck.
Temperature
The SMC motion sensors have been calibrated and designed to work within the stated temperature
range as specified in the motion sensor technical specifications. SMC recommend that the motion
sensor is mounted in a location without extreme variations in temperature.
Vibrations
Avoid mounting the motion sensor on any hull location that is subject to substantial vibrations. Also,
avoid mounting a sensor near to machines with sporadic operation e.g. hydraulic pumps. The use of
dampers between the Motion Sensor mounting plate or fixture points may be of benefit in
installations where vibrations are present. Care ought to be taken to ensure the dampers are
sufficiently firm so as not to introduce a sag and therefore alignment errors. Heavy vibrations will
reduce measurement performance mainly on the positioning outputs as for example heave as these
are calculated from the accelerations.
Weather protection
The SMC IMU-007, IMU-008, IMU-106, IMU-107 and IMU-108 are as a standard IP66 protection
rated. The standard surface motion sensor is designed to be mounted in a sheltered environment, an
enclosure is highly recommended to prolong service life and life time expectations.
The SMC IMU-108-30 is IP68 water resistant to 30 meters depth or optionally 1000 meters.
To Next Page
Loading...
Need help?
General
